As the most popular and most widely recommended sports supplement, whey protein is enormously popular and consequently is available in countless flavors and varieties. It’s convenient, tasty, inexpensive, a lot more portable than steamed chicken breasts, and it’s considered one of the highest quality proteins available — whey is extraordinarily high in leucine, the amino acid most closely associated with muscle gain. When someone is new to weight gain or weight loss, they’re frequently told to buy themselves some protein powder, but it’s easy to be overwhelmed by the options available. That’s why we tried dozens of different offerings so you can decide for yourself.
Optimum Nutrition Gold Standard Whey
The most popular protein powder on the market deserves its top spot. Optimum Nutrition has a huge variety of flavors — more than half a dozen kinds of chocolate alone — it’s reasonably priced, low in carbs and fat, and it gets great results from third party testers for purity and label accuracy.
- Gold Standard comes in a huge variety of flavors to satisfy any palate, including a couple of naturally flavored versions.
- Optimum Nutrition routine receives high marks for quality, purity, and label accuracy from third party testing company Labdoor.
- The product has added Aminogen®, a blend of enzymes that may help to increase the amount of protein you absorb from the product.
- Gold Standard contains soy lecithin, which is great for improving mixability, but it will give pause to consumers who avoid soy.
- The product typically contains the artificial sweetener acesulfame potassium.
The market's most popular whey lives up to its reputation as a solid all rounder with a huge variety of flavors to choose from.
Best for Athletes
Promix Nutrition Grass-Fed Whey Isolate
Promix Nutrition’s whey isolate is slightly newer to the whey protein playing field, but they’re holding their own against some of the market’s biggest players. Their grass-fed whey isolate promises high bioavailability which is a big factor for athletes that want to consume more natural options that are high in BCAAs and also environmentally friendly.
- Grass-fed whey promotes better bioavailability and can provide higher nutrient density than heavily processed whey protein powders.
- Around 6.9g of BCAAs per serving, so it’s a solid option for recovery and muscle building.
- There is no soy, corn, GMOs, or additives in this product, so it’s great for anyone wanting a more “natural” whey protein.
- Slightly higher in sugar. Athletes that are very low-carb may have an issue with this powder.
- A bit more expensive than other whey isolates.
- Taste can be hit or miss for some.
A grass-fed whey protein that promises high bioavailability and mixability for athletes that want a smooth tasting protein shake.
Muscle Feast Grass-Fed Whey Isolate
Muscle Feast is phenomenally inexpensive and it would be even if it were nothing but generic whey concentrate and artificial sweeteners. But it’s actually a really high quality product: the whey comes from cows that are free range and grass-fed, there’s no lactose, there’s no soy, no artificial ingredients, and it’s remarkably low in cholesterol and sodium.
- This is an extremely inexpensive whey protein powder, costing far less than the big name brands.
- Muscle Feast’s whey is about as all natural as you can get: grass-fed, free range, and no artificial flavors or sweeteners.
- As a whey isolate, Muscle Feast is pretty low in cholesterol, carbs, and fat.
- Muscle Feast hasn’t included digestive enzymes, as many competing products do. The benefits aren’t ironclad, but many prefer digestive enzymes as it may improve nutrient absorption.
- Perhaps in part because it’s all natural, Muscle Feast isn’t the best tasting protein out there.
- It’s worth remembering that grass-fed whey doesn’t have health benefits compared to regular whey, since the health benefits are largely restricted to the fat content (which has been almost entirely removed).
Easily one of the cheapest whey proteins on the market, which is all the more impressive given it's all natural and grass-fed.
Best All Natural
Onnit Grass-Fed Whey Isolate
Onnit is an unconventional fitness company and their flagship whey protein powder reflects that. Not only is it free from artificial flavors, artificial sweeteners, and soy, but it’s the best for digestive health on the market: it contains probiotic bacteria and a whopping seven digestive enzymes.
- There are no artificial ingredients here whatsoever.
- Onnit’s Grass-Fed Whey Isolate has a big commitment to digestive health, including seven digestive enzymes and some probiotic bacteria.
- That’s absolutely no sugar whatsoever in a scoop of this whey.
- Onnit’s whey is one of the most expensive on the market.
- This contains more carbs and fat than the average whey isolate.
Best for Paleo
Naked Nutrition’s Naked Whey
If you don’t like artificial ingredients or if you just want the most stripped back whey protein you can find, Naked Whey is a good pick for you. The vast majority of protein powders contain additives to help mixability, flavor, or absorption, but Naked Whey has absolutely nothing but whey concentrate in its least processed form.
- There are no artificial flavors or sweeteners in this product.
- The whey comes from cows that are grass fed, so it may contain more healthful fatty acids.
- The whey is cold processed without acid or bleach, which may bring some customers peace of mind.
- Because it has no additives at all, this whey doesn’t mix especially well and may be better suited to blending.
- Naked Whey isn’t suitable for people with lactose sensitivities.
- One scoop contains almost 20 percent of the recommended daily intake of cholesterol, which may put off some consumers.
The most basic type of whey protein powder you can find, Naked Whey has nothing but grass-fed whey concentrate — no flavors, thickeners, or additives.
Isopure Zero Carb
Isopure is America’s best selling whey isolate, a form of whey that’s been processed so as to remove a lot of the carbohydrates and fat. But Isopure isn’t just high in protein and surprisingly inexpensive, it’s also jam packed with added nutrients: about 30 percent of the recommended daily intake of 26 vitamins and minerals.
- For a whey isolate, Isopure is extraordinarily well priced.
- This product provides a huge range of vitamins and minerals.
- Most of the flavors have no carbohydrates whatsoever, making Isopure useful for a variety of different diets.
- The zero carb flavors don’t taste that great.
- Isopure contains added artificial sweeteners and flavors.
- All of these protein powders contain soy lecithin for mixability and xanthan gum, which a small minority of people have trouble digesting.
Completely carb free and packed with vitamins and minerals, Isopure has pulled off a remarkable feat with their zero carb whey isolate.
Best for Women
PrettyFit Whey Isolate
It’s a big misconception that protein powder is just for bulky guys who want to look like The Hulk. Everybody needs protein in their diet and while practically every whey protein is as useful for females as it is for males, PrettyFit specifically designed and marketed theirs to women. The main things to note are that it’s free from soy (which some have concerns can affect estrogen levels) and it’s extraordinarily low in calories, carbs, and fat.
- At 100 calories, 25 grams of protein per scoop, no fat, and under a gram of carbs, PrettyFit is unusually protein dense and can be used in a variety of diets.
- There are no artificial flavors or sweeteners in this whey.
- PrettyFit added digestive enzymes to their formula, which may improve nutrient absorption.
- PrettyFit’s whey is considerably more expensive than the average competitor.
- Perhaps because it has no soy lecithin, this whey doesn’t mix especially well with water.
Do the Different Types of Whey Matter?
There are two types of protein in milk: casein and whey. Traditionally, cheesemakers would separate the two and use the casein to make cheese, discarding the whey. But whey is a phenomenally high quality protein and when it makes its way to your tub of protein powder, it’s usually in in one of three forms (or a combination of them).
This is the least processed form of whey, so it’s the most inexpensive. The potential downsides are that it also has the most carbohydrates, lactose, fat, and cholesterol, so it’s the least protein dense.
But “least protein dense” is a very relative term when it comes to whey: you’re still looking at roughly 20 grams of protein to every 2 or 3 grams of carbs and fat, so it’s a great protein source if you don’t have sensitivities to lactose and don’t mind the creamier taste.
Whey isolate is the product of processing whey concentrate in such a way that it removes most of the carbs and fat — in fact, some isolates contain no carbs or fat whatsoever.
This makes whey isolate attractive to a lot of people following very low carb or low fat diets or those who want to minimize lactose in their whey. It’s pricier and not as tasty as whey concentrate.
Also called hydrolyzed whey, this is the most expensive of the three kinds of whey. Hydrolyzed whey is the most processed form of the protein — enzymes or acids are used to break down the whey so that it’s easier to digest. Some even call hydrolyzed whey “pre digested.”
It does indeed digest the fastest, with some research showing that it’s superior for helping athletes recover their power when they’re working out twice a day.(1)(2) It’s unlikely to have much practical benefit for the average person, though, and it’s worth noting that a lot of the protein in hydrolyzed whey is broken down into free amino acids, which can sometimes make it taste a little bitter.
So how did we land on the best whey protein powders? We tried each and every one of them — here’s the criteria we used.
Type of Whey
As cited above, every type of whey has its own pros and cons. Whey concentrate is creamier and cheaper, but has more calories and cholesterol; isolate is friendlier to restrictive diets but it’s pricier and not so tasty; hydrolysate digests the easiest but it can be bitter and expensive.
It’s untrue to say that something is unhealthy just because it’s artificial, but there’s no denying that a lot of people avoid artificial sweeteners, flavors, and so on. For this reason, we pointed out when a whey has artificial ingredients so you can make up your own mind.
Beside sweeteners, most controversial additives you’ll find in whey proteins are soy lecithin — used to help with mixability — and gums, to help thicken and stabilize the product. Some have sensitivities or experience indigestion to these ingredients, others simply feel they’re not great to consume, so we noted their presence.
Cost Per Gram of Protein
It’s not really enough to go by cost per tub or cost per serving, as protein powders vary in the size of their scoops. Since people are buying the product for the protein, cost per gram of protein is the best way to compare brands. The average price of a popular brand is between 3 and 6 cents per gram of protein, while more expensive wheys (such as those made from grass-fed dairy) usually cost more.
- There’s no denying that whey mixes more easily when it contains lecithin, a type of fat usually sourced from soy. If you don’t want to consume soy, look for sunflower lecithin instead.
- When calculating the cost of a protein powder, take the cost of a tub, divide it by the number of servings in a tub, then divide that by the grams of protein per serve. That’s the cost per gram of protein, a far more useful number than the cost for a tub or a scoop.
- A lot of people will tell you grass-fed whey is healthier, but the benefits of grass-fed dairy really only extend to the healthful fatty acids. Since most of the fat is removed from whey, the main benefit of grass-fed whey is really that the animals probably spent more time outside.
- Digestive enzymes like protease or Aminogen® are often added to protein powders, as limited evidence suggests that they may help to increase protein uptake and facilitate muscle healing post workout.(3)(4)
At the end of the day, every whey protein powder will give roughly 20 to 25 grams of high quality protein and less than 5 grams of fat or carbs. Unless you’re a high level athlete or you have digestive issues, the difference between the different forms of whey isn’t all that important — pick a brand that you think will taste good and doesn’t have ingredients you object to and enjoy a convenient, tasty way to meet your protein requirements.
- Potier M, et al. Comparison of digestibility and quality of intact proteins with their respective hydrolysates. J AOAC Int. 2008 Jul-Aug;91(4):1002-5.
- Buckley JD, et al. Supplementation with a whey protein hydrolysate enhances recovery of muscle force-generating capacity following eccentric exercise. J Sci Med Sport. 2010 Jan;13(1):178-81.
- Oben J, et al. An open label study to determine the effects of an oral proteolytic enzyme system on whey protein concentrate metabolism in healthy males. J Int Soc Sports Nutr. 2008 Jul 24;5:10.
- Miller PC, et al. The effects of protease supplementation on skeletal muscle function and DOMS following downhill running. J Sports Sci. 2004 Apr;22(4):365-72.