The 12 Best Protein Powders on Amazon in 2024, Tested and Trialed by Our Experts

These days, you can buy almost anything on Amazon — even a house. Yes, really. Go ahead and give it a search if you want your mind blown — but we’re talking about a much smaller Amazon Prime-able product here: protein powders. If you’re looking to avoid having to stand and peruse the shelves and shelves of protein powders you’ll find at any health food store, Amazon has you covered.  

If your budget doesn’t allow for an impulsive splurge on an Amazon house or one of the best treadmills on Amazon, perhaps one of the best protein powders on Amazon will suffice to help you build your actual home — AKA your body with building blocks known as amino acids. We at BarBend certainly think so, and our experts have tested dozens of options to bring you our favorite protein powders on Amazon.

The 12 Best Protein Powders on Amazon in 2024

• Best Protein Powder on Amazon Overall: Legion Whey+
• Best Tasting Protein Powder on Amazon: XWERKS Grow
• Best Whey Protein Powder on Amazon: Jacked Factory Authentic ISO
• Best Protein Powder on Amazon for Muscle Gain: Transparent Labs Whey Protein Isolate
• Best Vegan Protein Powder on Amazon: KOS Organic Plant Protein
• Best Plant-Based Protein Powder on Amazon: Ritual Essential Daily Shake 18+
• Best Budget Protein Powder on Amazon: Optimum Nutrition Gold Standard 100% Whey Protein Powder
• Best Protein Powder on Amazon for Athletes: Klean Athlete Klean Isolate
• Best Organic Protein Powder on Amazon: Orgain Organic Protein Powder
• Best Casein Protein Powder on Amazon: Naked Micellar Casein
• Best Clean Protein Powder on Amazon: NOW Sports Nutrition Whey Protein Isolate
• Best Unflavored Protein Powder on Amazon: Bulk Supplements Whey Protein Isolate

Editor’s note: The content on BarBend is meant to be informative in nature, but it should not be taken as medical advice. The opinions and articles on this site are not intended for the diagnosis, prevention, and/or treatment of health problems. It’s always a good idea to talk to your doctor or nutritionist before beginning a new fitness, nutritional, and/or supplement routine. 

How We Tested and Chose the Best Protein Powders on Amazon

The BarBend team is made up of competitive athletes, certified personal trainers, and lifelong fitness enthusiasts. To determine the best protein powders available on Amazon, we’ve tested nearly 100 different supplements from some of the industry’s most-trusted brands using a multi-point methodology to rate each profile on a scale of 1 (lowest) to 5 (highest). Below are some of the categories and components that played into our rankings.

We also worked with a third-party accredited lab of our own to rate and score a handful of picks, analyzing each product’s purity and label accuracy. Ratings for areas including the presence of metals, pesticides, phthalates, bisphenols, and overall label accuracy were based on how well each protein sample compared to others in the sample pool.

For further information on how we trial and test the products chosen for this guide and more, be sure to read the BarBend Supplement Testing Methodology page.

• Protein content and source: Ideally, a protein powder should provide at least 20 grams of protein per scoop to support muscle synthesis, and our top picks meet this requirement. (1) We also offer both whey and plant-based protein sources to cater to different dietary needs and preferences.
• Additional ingredients: Protein should be the primary ingredient, but other additions can enhance flavor, solubility, and nutrition. We focus on products with beneficial ingredients, like digestive enzymes, and limit unnecessary fillers and added sugars. 
• Flavor: We understand that taste is subjective, so we’ve chosen a variety of flavors (including unflavored options) that we believe will appeal to most people. A great-tasting protein powder can make it easier to reach your protein goals, so we place high regard on nutritious and delicious products.
• Third-party testing: Since the Food and Drug Administration does not strictly regulate supplements, we prioritize third-party-tested products to ensure their purity and safety. We also look for certifications that guarantee the products are free from banned substances, providing peace of mind for athletes subject to drug testing.
• Cost: We aim to accommodate a range of budgets, so our recommendations include options at different price points. This way, most (if not all) of our readers can find a high-quality protein powder that fits their financial needs.

Best Protein Powder on Amazon Overall: Legion Whey+

High-quality whey protein? Check. Over 20 grams of protein per serving? Check. Third-party-tested? Check. Legion Whey+ checks all our boxes regarding what we look for in a protein powder, earning itself the slot of best protein overall on Amazon. 

BarBend expert reviewer Chelsea Rae Bourgeois, M.S., R.D.N., L.D., values how Legion Whey+ is clinically dosed to support muscle recovery and growth and provides 20+ grams of whey protein per scoop without all the “artificial junk.” Although she highlights, “It’s not the most protein-dense protein powder, but its macro ratios and ingredient sources are impressive.” Our testers rated its formulation a 4.75 out of 5.

Legion Whey+ comes in 16 flavors, from Apple Pie to Cocoa Cereal to Birthday Cake. Our tester, a certified personal trainer, tried the Cinnamon Cereal flavor, noting it’s similar to that beloved first bite of CTC (Cinnamon Toast Crunch), but the flavors haven’t had a chance to fully meld into the milk just yet. “The flavor’s there, it’s just not that rich, nostalgic Cinnamon Toast Crunch taste we all know and love,” our tester elaborates, giving it 4.5 out of 5 for taste but a 5 for its seamless solubility. 

However, Bourgeois points out, “Some flavors of Legion Whey+ contain a significant amount of potassium, which may be a concern if you also take an electrolyte supplement. Too much of a good thing isn’t always a good thing, especially if you have kidney issues.”

Although Bourgeois appreciates its third-party testing, as do we at BarBend, we worked with an independent testing facility and found traces of heavy metals. However, it earned As across the board for its label accuracy and lack of pesticides, phthalates, and bisphenol. 

Read our full Legion Whey+ Protein Review. 

Best Tasting Protein Powder on Amazon: XWERKS Grow

“This is incredible, and maybe even the best-tasting protein I’ve tried!” our tester exclaims about XWERKS Grow’s vanilla flavor. ‘Nuff said about our favorite flavored protein on Amazon? Maybe, but there’s much more to explore. 

XWERKS Grow offers four traditional flavors: Chocolate, Peanut Butter, Strawberry, and Vanilla. While the selection is limited and conventional, it underscores the brand’s focus on quality over quantity, achieving what XWERKS calls a “ridiculously delicious flavor.”

Our tester tried Vanilla by mixing it with both water and milk. They praised it as “perfect,” likening it to a vanilla milkshake rather than just vanilla. The protein powder strikes a balance of sweetness, tasting better in milk but still enjoyable with water.

Another tester, a certified personal trainer, tried the Chocolate flavor and found it reminiscent of a protein Yoohoo. They described it as the finest powder they’ve ever tried, with an incredibly smooth texture. They even noted that a blender ball is barely necessary.

Given these rave reviews, it’s no surprise that XWERKS earns a 5 out of 5 for taste and solubility, making it our top pick for flavor. Our tester raved, “From its delicious taste to its impeccable blending, everything was nothing short of perfect!” 

Beyond flavor, the formulation is also impressive. Our testers rate it a solid 4.5 out of 5 due to its high protein content and use of natural sweeteners. Expert reviewer Chelsea Rae Bourgeois, M.S., R.D.N., L.D. highlights, “I like that XWERKS Grow is a lean protein powder, providing 25 grams of protein per scoop. And you get 6 grams of BCAAs — another bonus.” This high-protein formula also satisfied our tester without causing uncomfortable gas or bloat.

The only minor drawbacks of XWERKS are its packaging and higher cost. Although our tester likes the bag’s trendy packaging, they’d prefer a more traditional container for ease of use. Additionally, while there are some nutritional differences between grass-fed whey vs. regular whey, it’s still uncertain whether the typically higher cost of grass-fed whey is worth it. However, despite the price, Bourgeois believes the quality of XWERKS justifies its cost.

Read our full XWERKS Grow Whey Protein Review. 

Best Whey Protein Powder on Amazon: Jacked Factory Authentic ISO

If you’re searching Amazon for one of the best whey protein powders, Jacked Factory Authentic ISO supplies 25 to 27 grams of protein per scoop with minimal carbs and fats. Expert reviewer Chelsea Rae Bourgeois, M.S., R.D.N., L.D. highlights its appeal: “I like that Jacked Factory uses whey protein from 100% grass-fed cattle, and I love its macro breakdown.” This lean profile is ideal for anyone tracking macros and/or on a cut, though anyone is welcome to try it.

However, Bourgeois cautions, “Some flavors provide up to 300 milligrams of sodium, a significant portion of your recommended daily intake. If you’re watching your sodium intake, you might not be keen on this protein powder. I also wish it was third-party tested for safety and purity.” Factoring in these drawbacks, it still earns a solid 4.25 out of 5 for its formulation.

Jacked Factory offers “Post” in Oatmeal Chocolate Chip and Vanilla, among the ISO flavors. Alongside 25 grams of protein, they include 3,000 mg of creatine monohydrate (the type of creatine most commonly used and researched) and 2,500 mg of betaine anhydrous for post-workout recovery. (2) Recognizing this option can guide and optimize your supplement strategy.

Two of our testers were impressed by Vanilla ISO. After testing with water and milk, they found it mixed well with handheld and portable mixers—though they agreed milk was superior. One tester noted, “The texture was remarkably smooth with a slightly thicker mouthfeel. It frothed as I mixed it, but it quickly dissipated.” Both rated its solubility a 4 out of 5.

Taste received slightly mixed but positive reviews. One tester found the Vanilla true to flavor but overly sweet, rating it a 4 out of 5. The other tester thought the vanilla flavor was spot on despite its sweetness, giving it a 5 out of 5.

Regarding side effects, neither tester experienced any bloating, gas, or feeling overly full. However, one suggested treating it as a dessert or snack since it’s thicker and might be too filling with a meal. Satisfy cravings and boost protein without added sugar? Say less. 

Read our full Jacked Factory Authentic ISO Review. 

Best Protein Powder on Amazon for Muscle Gain: Transparent Labs Whey Protein Isolate

Transparent Labs Whey Protein Isolate is a BarBend favorite, and its 28 grams of protein per serving make it our top choice to build muscle. Moreover, it supplies all essential amino acids (EAAs) and branched-chain amino acids (BCAAs), particularly leucine, to support muscle protein synthesis and growth. (3) 

“I love that you get 28 grams of high-quality protein without any unnecessary fluff — like artificial sweeteners and dyes. Plus, it’s tested by a third-party lab, and the certificates of analysis are available right on the website,” says expert reviewer Chelsea Rae Bourgeois, M.S., R.D.N., L.D. The biggest concern is that some flavors contain up to 370 milligrams of sodium per serving, something to watch if you monitor sodium intake. Our testers rate the formulation a solid 4.5 out of 5, appreciating its core ingredients of whey protein isolate, Himalayan rock salt, stevia, and natural flavors.

After working with an independent lab, we discovered it’s among the top 10 percent for its label accuracy and lack of pesticides, plates, and bisphenols. It did register for heavy metals, although it’s still among the top 25 percent of protein powders.

Transparent Labs also excels in taste, and one tester deemed it one of the best protein powders after trying the seasonal Peppermint Hot Chocolate flavor. They said it evoked the cozy feel of hot chocolate and suggested adding whipped cream and marshmallows for an elevated experience (hint for next winter, Transparent Labs?). While not as frothy as hot chocolate, it’s rich and smooth — the tester gave it a 5 out of 5 for taste and solubility.

Another tester tried the Milk Chocolate flavor, noting it was “spot on,” especially when mixed with milk. However, they found it slightly chalky and clumpy compared to other protein powders, even after blended in a shaker bottle or hand mixer. Despite this, they would use it again and try different flavors, rating it a 4 out of 5.

Both testers found the protein powder satisfied them after consuming it and didn’t experience unpleasant side effects like bloating or an upset stomach. One tester also appreciated the convenient and recognizable packaging.

Read our full Transparent Labs Whey Protein Powder Review.

Best Vegan Protein Powder on Amazon: KOS Organic Plant Protein

KOS Organic Protein Powder is one of the best vegan protein powders with a well-rounded nutritional profile. Offering 20 grams of protein per serving from sources like pea, flaxseed, pumpkin seed, quinoa, and chia seed, it’s a complete protein without any soy or animal products.

Nutrition expert Chelsea Rae Bourgeois appreciates the blend, saying, “I like that KOS Organic Plant Protein includes five different proteins, making it a complete source. I also like that KOS includes digestive enzymes to support digestion. Plus, it’s free from sugar alcohols, dairy, and soy, which can cause GI upset in some people.”

Bourgeois does have one reservation: the proprietary nature of the digestive enzyme blend. “I prefer to know exactly what and how much I’m consuming.” This transparency issue slightly reduces the testers’ otherwise high formulation score to 4.75 out of 5, though Bourgeois and our testers remain a fan of the ingredients and macro breakdown.

It’s important to note that formulations vary between flavors — for example, Chocolate Peanut Butter contains an “Organic Fruit and Veggie Blend” while Blueberry Muffin contains an “Organic Superfood and Adaptogen Blend.” Although this doesn’t significantly alter the macros, it does change the micronutrients, such as vitamins C and K. Consider these to avoid toxicities and build the best supplement stack.

Moving on to taste, our tester, a certified personal trainer, found the flavor pleasing, though with a slightly chalky aftertaste. “Even though I’m mostly a carnivore, I wouldn’t be sad guzzling down this vegan protein shake every day,” they noted. While the solubility is generally good, the large two-scoop serving size can result in some residue settling at the bottom of the cup. Our tester recommends using a countertop blender and a thicker base like almond milk for a thick, creamy, protein-packed treat.

We scored the price per serving at 4 out of 5. At $1.72 per serving, KOS Organic is competitively priced within the $1 to $2 range of other vegan protein powders. However, with the largest container size offering only 28 servings, expect to make repeat orders each month.

Read our full KOS Vegan Protein Review. 

Best Plant-Based Protein Powder on Amazon: Ritual Essential Daily Shake 18+

Ritual Essential Daily Shake 18+ stands out as Amazon’s best plant-based protein powder beyond its 20 grams of organic pea protein per serving. It also strategically delivers 400 milligrams of the essential amino acid L-methionine.

Pea protein is low in methionine, and expert reviewer Chelsea Rae Bourgeois, M.S., R.D.N., L.D. notes, “I especially like that Ritual added L-methionine to make it a complete protein. Methionine is an essential amino acid, meaning our bodies need it but can’t produce it, so it’s super convenient to get it in your protein powder.” Ritual also includes choline to increase methionine levels and organic sweeteners, flavors, and MCT oil to enhance consistency and flavor. (4) 

However, Bourgeois cautions, “Each serving provides 290 milligrams of sodium, which is something to consider if you watch your sodium intake.” After deducting its sodium content, the plant-based powder scores a 4.5 out of 5 for its formulation.

We also can’t overlook Ritual’s impressive commitment to transparency and quality. “I’m a huge fan of companies that are transparent with their formulas, and Ritual’s got that down to a science,” says Bourgeois. “It’s third-party tested and made with traceable ingredients, so you know exactly what you’re putting in your body and where it came from.”

The high-quality formulation extends to taste and solubility. One tester, a certified personal trainer, noted a semi-chalky aftertaste with water and in their berry smoothie but still rated it a 4 out of 5 for taste. Another tester loved it in water and blended with almond milk and fruit, giving it a 5 out of 5.

In terms of texture, one tester noticed a slight grittiness when swallowing, but quickly subsided and didn’t detract from their overall positive experience. Our other tester was surprised by its smooth consistency, even when mixed with water. Both testers agree Ritual’s solubility deserves a perfect 5 out of 5 rating. 

However, the formulation also affects the cost. “The cost is another deterrent for me,” comments Bourgeois. “You only get 15 servings per container, which means you’re paying around $2.67 for 20 grams of protein [with a subscription].” Despite the price, testers love the product and tolerate it well.

Best Budget Protein Powder on Amazon: Optimum Nutrition Gold Standard 100% Whey Protein Powder

Averaging $1.30 per serving and as little as $0.88 on select flavors with bulk and subscription savings, Optimum Gold Standard Whey shows you can make gains without losing all your Benjamins. Not to mention all the flavors — Cinnamon Roll or Rocky Road, anyone? Before contemplating which flavor to choose (although we’ll guide you to the best Optimum Nutrition flavors) let’s ensure it suits you.

Expert reviewer Chelsea Rae Bourgeois, M.S., R.D.N., L.D. “wheys” in on its formula: “I like the low-carb macro ratio and that you get 24 grams of protein with every scoop, including a good amount of BCAAs and EAAs.” However, “It’s interesting it uses a blend of whey protein blend, and it’d be nice knowing how much of each is included. It also uses artificial flavorings, which is a turn-off for some.” The macro ratio is strong, but the blend and artificial ingredients reduce the formulation rating to 4 out of 5 from our testers.

Now, about these flavors… Many testers, also personal trainers, gave perfect 5s for taste, especially for Delicious Strawberry, calling it a family favorite. But Mocha Cappuccino might be the new favorite with its rich, chocolatey coffee flavor. Double Rich Chocolate also received a 5 out of 5, praised for its balanced richness and being a tester’s go-to for almost a decade.

Chocolate Peanut Butter had mixed reviews: One tester found it too powdery, while another loved it, settling on a 4.5 out of 5. French Vanilla Creme fell flat with water but became a delicious “milkshake” with dairy milk, earning a 3.5 out of 5. Cookies & Cream received a 3 out of 5, as our tester didn’t enjoy the crunchy bits and found it too milky. 

Despite mixed flavor reviews, all testers gave its solubility a perfect 5, agreeing it dissolves smoothly, especially in an electric blender.

Optimum received top ratings during our independent tasting, placing it in the top 10 percent of the 150+ powders tested. Plus, it’s Informed-Choice certified, so athletes (and non-athletes) can rest easy knowing it’s free from banned substances and safe for consumption.

Read our full Optimum Nutrition Gold Standard Whey Protein Review. 

Best Protein Powder on Amazon for Athletes: Klean Athlete Klean Isolate

Dietary supplements aren’t tightly regulated by the Food and Drug Administration (FDA), which means they could be contaminated with banned substances. This is a significant concern for athletes subject to drug testing. Fortunately, some brands, like Klean ATHLETE, go the extra mile with voluntary third-party testing and certifications like NSF Certified for Sport, ensuring peace of mind for athletes and consumers alike.

Klean ATHLETE’s Unflavored powder offers 20 grams of protein per scoop, slightly less than typical whey protein isolates, but with a smaller serving size of 22 grams than the usual 30 grams. It’s incredibly lean, boasting 0 grams of fat, 1 gram of carbs, and just 85 calories, primarily from the protein itself and sunflower lecithin for improved mixability. The flavored options maintain a lean profile with up to 2 grams of carbs and 1 gram of fat.

Our tester, a former Olympian, found the unflavored version mixed with water to be quite neutral in taste, rating it a 4 out of 5 for flavor and a 5 out of 5 for solubility, despite some froth and a slight protein aftertaste.

Another tester tried the Chocolate flavor, using it daily in protein ice cream and occasionally in shakes with unsweetened vanilla almond milk. Due to its thin consistency and mild sweetness, they avoided mixing solely in water. Although our tester appreciated its natural cocoa flavor, they commented, “I prefer dessert-level sweetness, and this didn’t deliver that chocolate milkshake vibe I was hoping for.” Your mileage may vary if you enjoy the slight bitterness of cocoa, but our tester gave it a 2.5 for taste.

The Chocolate flavor’s mixability scored a 3 out of 5 due to initial clumping and sticking to the shaker cup’s sides, which eventually smoothed out with more shaking. The tester found the consistency thin and preferred thicker shakes.

Despite no side effects and enjoying the cocoa flavor, one tester wouldn’t use it again, favoring sweeter options. However, they recommend Klean ATHLETE for athletes on a strict diet seeking a high-quality, straightforward protein powder, even if it comes at a higher cost.

Best Organic Protein Powder on Amazon: Orgain Organic Protein Powder

Orgain Organic Protein Powder stands out for its clean ingredients and excellent taste. Our tester, a certified personal trainer, even considers it the best vegan protein available, stating, “No other plant protein has persuaded me to make the switch from Orgain. I seriously love and routinely use it.” While this might already be enough to convince you to click “Buy Now,” let’s delve into the formulation.

First, we need to clarify that “organic” isn’t synonymous with “healthy.” It only indicates that the product is made without chemical fertilizers, pesticides, or artificial agents and does not imply it is free of added sugars, fats, oils, or fillers. However, some research suggests that increasing organic food intake may lead to positive health outcomes, such as reduced incidences of infertility and metabolic syndrome. (5) 

With that out of the way, Orgain Organic Protein Powder provides 21 grams of protein per serving, primarily from organic pea protein, and up to 180 calories, 16 grams of carbs, and 5 grams of fat. Some flavors are also rich sources of dietary fiber, iron, and calcium. 

However, some flavors contain up to 420 milligrams of sodium per serving, and the Iced Coffee flavor provides 60 milligrams of caffeine — something to be mindful of when monitoring intake. The powder also contains gums and erythritol, which may cause digestive distress in some individuals. Despite initial concerns, our tester experienced no issues and even found it to improve digestion “if you’re pickin’ up what I’m putting down.” #Ditto 

But about that excellent taste… Our testers tried the Vanilla Bean and Creamy Chocolate Fudge flavors. The vanilla flavor had a generic sweetness that masked the earthiness of pea protein, with a milder aftertaste from the stevia and erythritol compared to other plant-based proteins. The standout is the Creamy Chocolate Fudge, compared to rich hot chocolate even when mixed with water. Though the two-scoop serving size is substantial and doesn’t fully blend in a regular shaker bottle, the texture is smooth, especially when blended into a smoothie. Our testers gave it a 4 out of 5 in the solubility department. 

They also wish the cost was lower. But all those aforementioned details — like its organic certification and taste — make the price worth it. This product still received a 4 out of 5 for price from our testers.  

Best Casein Protein Powder on Amazon: Naked Micellar Casein

We’ve chatted a lot about the popular whey protein, but casein deserves the spotlight, and we’re exposing Naked Micellar Casein. Like whey, casein is a milk protein that provides all essential amino acids. However, when comparing whey protein vs. casein protein, casein has notable advantages. Let’s dive into how this applies to Naked.

One of the key benefits of casein protein is its slower absorption rate, meaning protein releases into your muscles gradually. This slow-release property helps you feel fuller for longer, earning it the nickname “sleep protein” because it can fuel your muscles and keep you satisfied as you sleep. Casein may also support bone, metabolic, and gut health. (6)(7)(8) 

The Unflavored option of Naked Micellar Casein is as pure as it gets, containing just one ingredient and providing 26 grams of protein. The Chocolate and Vanilla flavors have two additional ingredients: organic coconut sugar and organic cacao powder or natural vanilla flavor, respectively. These flavors provide 5 grams of added sugar, which might appeal to those who prefer natural sweeteners over artificial ones.

Our tester, a certified personal trainer, tried the unflavored version and noted, “Mixing it with chocolate syrup is the only way I’ll drink this stuff.” They also experimented with a concoction of cinnamon, nutmeg, vanilla, and a splash of coffee, which was better but still nothing to write home about.

However, if you love cake, listen up: “This protein powder makes one mean chocolate mug cake, which makes sense given that casein is the ideal protein for baking,” our tester relayed. If you’re looking for the best casein powder for baking with more flavor options, check out Dymatize Elite Casein — also not to be confused with Dymatize ISO100 Hydrolyzed Protein Powder, which won’t deliver the same desired texture as casein.

Like most casein powders, Naked micellar casein doesn’t blend as easily as whey but dissolves without delayed settling. Overall, our tester gives its taste and solubility a 4 out of 5 rating.

Best Clean Protein Powder on Amazon: NOW Sports Nutrition Whey Protein Isolate

Although there’s no formal definition for a “clean” protein powder, we can consider it a high-quality formulation with minimal additives. NOW Sports Nutrition Whey Protein Isolate fits this bill, delivering 25 grams of protein without the “unnecessary fluff,” as expert reviewer Chelsea Rae Bourgeois, M.S., R.D.N., L.D. notes.

Bourgeois emphasizes, “I really like that you’’e paying for whey protein, and that’s exactly what you’re getting with NOW Sports Whey Protein Isolate. It’s low in carbs and fat, containing less than one gram each, so it won’t skew your macro count when you’re just trying to increase your protein intake.” We also appreciate how it’s low-sodium compared to other protein powders and formulated with sunflower lecithin, a low-allergen alternative to the commonly used soy lecithin.

One downside is that the flavored options include xylitol (one gram or less), a sugar alcohol that may cause digestive side effects. Fortunately, it’s generally well-tolerated and safe for human consumption, with bloating and loose stools most common above 20 grams. (9) However, it’s highly toxic to dogs, which NOW cautions.

Our tester tried the unflavored whey protein and found it to have the typical “whey” taste when mixed with water, which isn’t great but tolerable. “I could see this being a great way to boost protein when mixed in a smoothie and other flavored drinks to mask the taste,” they hypothesized, giving it a taste rating of 4 out of 5. The protein powder also blended without clumps and had a just-right texture, neither too thick nor too thin, scoring a 5 out of 5 for solubility.

In addition to being “clean,” NOW Sports Nutrition Whey Protein Isolate is also budget-friendly, especially when bought in bulk. earning a 5 out of 5 for price per serving from the BarBend team. A 142-serving bag costs as little as $0.80 per serving or $0.91 for an 81-serving container if you prefer not to “dirty bulk” and purchase conservatively. The BarBend team rated it a 5 out of 5 for price per serving, and we crowned it the best whey protein isolate on a budget.

To top it all off, NOW Sports Nutrition Whey Protein Isolate is Informed-Sport Certified, ensuring its quality and safety for athletes.

Read our full NOW Sports Whey Protein Isolate Review.

Best Unflavored Protein Powder on Amazon: Bulk Supplements Whey Protein Isolate

No frills, no fluff, just pure protein — Bulk Supplements Whey Protein Isolate takes the crown for the best unflavored protein powder on Amazon. While its “flavor” (or rather its neutral taste reminiscent of diluted milk) scores a modest 3.5 out of 5 from our testers, they note, “It shines when added to other flavored beverages or recipes for a protein boost.” Here’s the detailed scoop (or lack thereof, and more on that soon) about BulkSupplements.com.

BulkSupplements.com’s unflavored whey is as pure as it gets — really. With an “A” grade from Ellipse Analytics, it excels in label accuracy and is free of metals, pesticides, phthalates, and bisphenols. This places Bulk Supplements whey protein isolate in the top 10 percent of the 150+ powders tested.

So, what does it provide? Thanks to its simple two-ingredient list (whey protein isolate and soy lecithin), each serving delivers 26 grams of protein with minimal carbs and fat. Soy lecithin helps prevent clumping and improves mixability, but some consumers may wish to avoid soy, slightly lowering its formulation rating from our testers to 4.25 out of 5.

One minor inconvenience is measuring the four-tablespoon serving size with your own tablespoons, as it doesn’t come with a scoop. If you can overlook the minor inconvenience of measuring your servings, BulkSupplements.com offers exceptional value, especially when you buy in bulk. Their smallest offering on Amazon is a 3-serving pack, perfect for a trial run, but it costs $5.32 per serving.

Now, let’s climb the bulk ladder: An 8-serving bag comes in at $2.75 per serving, a 17-serving bag at $1.76 per serving, and a 33-serving bag at $1.33 per serving. For those who are really committed, the 170-serving bag amounts to just $0.95 per serving. 

And then, the ultimate bulk option: a 44-pound bag, estimated to contain around 660 servings (based on 33 servings in a 2.2-pound bag, multiplied by 20), which breaks down to an unbeatable $0.79 per serving. Who wants to go in on it with your fitness friends and share the savings?

Read our full Bulk Supplements Whey Protein Isolate Review.

Benefits of Protein Powders on Amazon

Protein powders on Amazon offer a convenient, versatile, and effective way to meet your protein needs, support muscle growth, aid in weight loss, and enhance overall health. They also provide transparency in customer reviews and cost-saving subscription options.

• Convenience: While high-protein foods should be your dietary foundation, protein powders offer unmatched convenience. Sure, you could pack a chicken breast to hit your anabolic window, but with protein powder, you don’t have to worry about storage or spoilage — just don’t leave a mixed shake in a hot car.
• Same-day delivery: Many protein powders on Amazon can be delivered same-day, ensuring you always have your favorite supplement on hand. 
• Cost savings: Subscribing to your favorite protein powder on Amazon can save you money, with many products offering discounts for regular deliveries.
• Versatility: You can mix protein powder in just about anything, including oatmeal, smoothies, and even pudding. Unflavored protein powders can also be added to pasta or baked goods, offering endless possibilities for incorporating more protein into your diet.
• Muscle growth: Protein is crucial for muscle building, especially when combined with resistance training. (10) Our top picks provide at least 20 grams of protein, enough suggested to promote muscle protein synthesis. (1)
• Weight management: The best protein shakes prove safe and effective for weight loss, reducing body mass index (BMI), waist circumference, and body fat percentage. (11) Choose protein powders low in fat and sugars for optimal benefits. 
• Transparent reviews: One of the best parts of shopping on Amazon is the access to honest customer reviews, which is especially helpful if you’re curious about a product not on our list. Let’s say you’re interested in Isopure’s protein powder — you can sift through Amazon reviews for insights (and check out our Isopure Zero Carb Protein Powder Review).
• Overall health support: Protein powders often provide other essential nutrients like calcium and iron, supporting overall fitness and health. Research shows combining protein supplements with probiotics can enhance digestion and gut health, so consider taking advantage of the best probiotic supplements. (11)

How Much Do Protein Powders on Amazon Cost?

Based on our research and top picks, protein powders on Amazon average $1.90 per serving, with prices ranging from $1.33 to $2.98 depending on the brand, formulation, and additional features like third-party testing and certifications. These costs reflect one-time purchases of typical container sizes (providing closest to a month’s supply) rather than sample packs or bulk offerings. 

Best Protein Powder on Amazon Overall	Legion Whey+	$2.00
Best Tasting Protein Powder on Amazon	XWERKS Grow	$2.13
Best Whey Protein Powder on Amazon	Jacked Factory Authentic ISO	$1.33
Best Protein Powder on Amazon for Muscle Gain	Transparent Labs Whey Protein Isolate	$2.00
Best Vegan Protein Powder on Amazon	KOS Organic Plant Protein	$1.82
Best Plant-Based Protein Powder on Amazon	Ritual Essential Daily Shake 18+	$2.97
Best Budget Protein Powder on Amazon	Optimum Nutrition Gold Standard 100% Whey Protein Powder	$1.28
Best Protein Powder on Amazon for Athletes	Klean Athlete Klean Isolate	$2.98
Best Organic Protein Powder on Amazon	Orgain Organic Protein Powder	$1.78
Best Casein Protein Powder on Amazon	Naked Micellar Casein	$1.66
Best Clean Protein Powder on Amazon	NOW Sports Nutrition Whey Protein Isolate	$1.50
Best Unflavored Protein Powder on Amazon	Bulk Supplements Whey Protein Isolate	$1.33

What to Consider Before Buying Protein Powders on Amazon

Choosing the right protein powder can be a game-changer in your fitness journey, but it’s not one-size-fits-all — and that’s exactly why we offer a variety of top picks on Amazon. Refer to our selections and these tips to find the protein powder that best suits you.

Protein Content and Source

Look for a protein powder with at least 20 grams per serving, and consider the type of protein that fits your needs. (1) While whey is the most common, casein and plant-based options are also available. Moreover, plant-based proteins aren’t just for plant-forward eaters; they’re excellent dairy and lactose-free options for those with dairy allergies or intolerances.

Utility

While we still value our trusty shaker bottle, protein powders are no longer just for standard shakes — you can blend them into smoothies, oatmeal, and more. Think about how you’ll use the powder most and find a flavor to match. For instance, pick your favorite flavor with solid solubility if you want a shake. For ultimate versatility, a traditional vanilla protein powder may be best.

Cost

To find a product that fits your budget, consider whether bulk or subscription savings are available and how often you’ll use your product. To paint this picture, let’s say you only need protein powder for occasional use, so you consider a 28-serving container of Optimum Nutrition. 

While larger containers are more economical per serving, it doesn’t make sense to spend more money on an ample supply you aren’t sure to use—unless you want to split it with a fitness friend.

Third-Party Testing and Certifications

We prioritize third-party-tested products and recommend you do the same, especially if you’re an athlete, or have dietary intolerances or allergies. For instance, even if a product claims to be “gluten-free” and doesn’t contain gluten ingredients, it could be cross-contaminated during processing if not tested for purity and safety. If you have celiac disease or a high sensitivity to gluten, choose a product that’s “Certified Gluten-Free,” like Naked Micellar Casein.

Protein Powders on Amazon FAQs

References

1. Jäger R., Kerksick C.M., Campbell B.I., Cribb P.J., Wells S.D., Skwiat T.M., Purpura M., Ziegenfuss T.N., Ferrando A.A., Arent S.M., Smith-Ryan A.E., Stout J.R., Arciero P.J., Ormsbee M.J., Taylor L.W., Wilborn C.D., Kalman D.S., Kreider R.B., Willoughby D.S., Hoffman J.R., Krzykowski J.L., Antonio J. (2017). International Society of Sports Nutrition Position Stand: protein and exercise. JISSN. https://jissn.biomedcentral.com/articles/10.1186/s12970-017-0177-8  
2. Kreider R.B., Kalman D.S., Antonio J., Ziegenfuss T.N., Wildman R., Collins R., Candow D.G., Kleiner S.M., Almada A.L., Lopez H.L. (2017, June 13). International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. J Int Soc Sports Nutr. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5469049/ 
3. Arroyo-Cerezo A, Cerrillo I, Ortega Á, Fernández-Pachón MS. (2021). Intake of branched chain amino acids favors post-exercise muscle recovery and may improve muscle function: optimal dosage regimens and consumption conditions. J Sports Med Phys Fitness. https://pubmed.ncbi.nlm.nih.gov/33586928/ 
4. Innis S.M., Davidson A.G., Melynk S., James S.J. (2007). Choline-related supplements improve abnormal plasma methionine-homocysteine metabolites and glutathione status in children with cystic fibrosis. Am J Clin Nutr. https://www.sciencedirect.com/science/article/pii/S0002916523279769# 
5. Vigar V., Myers S., Oliver C., Arellano J., Robinson S., Leifert C. (2019, Dec 19). A Systematic Review of Organic Versus Conventional Food Consumption: Is There a Measurable Benefit on Human Health? Nutrients. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7019963/ 
6. Bonjour J.P. (2005). Dietary protein: an essential nutrient for bone health. J Am Coll Nutr. https://www.tandfonline.com/doi/abs/10.1080/07315724.2005.10719501 
7. McGregor R.A., Poppitt S.D. (2013 July, 3). Milk protein for improved metabolic health: a review of the evidence. Nutr Metab (Lond). https://nutritionandmetabolism.biomedcentral.com/articles/10.1186/1743-7075-10-46 
8. Kitts DD, Weiler K. (2003). Bioactive proteins and peptides from food sources. Applications of bioprocesses used in isolation and recovery. Curr Pharm Des. https://pubmed.ncbi.nlm.nih.gov/12769739/ 
9. Salli K,, Lehtinen M.J., Tiihonen K., Ouwehand A.C. (2019, Aug) Xylitol’s Health Benefits beyond Dental Health: A Comprehensive Review. Nutrients. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6723878/ 
10. Krzysztofik M., Wilk M., Wojdała G., Gołaś A. (2019). Maximizing Muscle Hypertrophy: A Systematic Review of Advanced Resistance Training Techniques and Methods. Int J Environ Res Public Health. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6950543/ 
11. Ambulkar P., Hande P., Tambe B., Vaidya V.G., Naik N., Agarwal R., Ganu G. (2023). Efficacy and safety assessment of protein supplement – micronutrient fortification in promoting health and wellbeing in healthy adults – a randomized placebo-controlled trial. Transl Clin Pharmacol. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10079511/