Best Vitamin B Complexes For Vitamin C, Vegetarians, and More

These supplements can help increase your daily intake of the eight essential B vitamins.

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Contrary to its name, vitamin B complex is actually pretty simple. It’s a combination of eight common B vitamins into one product. These different compounds include Vitamins B1, B2, B3, B5, B6, B7, B9, and B12

While people may well get enough B vitamins from eating a diversified diet, some may benefit from supplementation. Folks who might opt for Vitamin B supplements include pregnant people, and those who follow strict vegan, vegetarian diets, or paleo diets. In general, it’s wise to consult with a medical professional about the specifics of vitamin supplementation before you start any new supplement. 

The various nutrients in vitamin B complexes contribute to a number of bodily functions, including cellular health, energy levels, and digestion. With a seemingly endless amount of Vitamin B supplements available on the market, it’s important to know how to distinguish one from another. We looked at some of the best vitamin B complex supplements out there to help you find the one that might be best for you. 

The Best Vitamin B Complexes

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 use as diagnosis, prevention, and/or treatment of health problems. It’s always a good idea to talk to your doctor before beginning a new fitness, nutritional, and/or supplement routine. Individual needs for vitamins and minerals will vary.

Best Overall Vitamin B Complex

When looking for the best vitamin B complex out there, we landed on Onnit Active B Complete. It gives you all the essential B vitamins you need without adding extra unnecessaries.

Onnit Active B Complete

This B complex includes all eight essential B vitamins — vitamin B1, B2, B3, B5, B6, B7, B9, and B12. Each serving of this B complex contains over 100 percent of your RDI (recommended daily intake) for each B vitamin. 

One unique factor of Onnit Active B Complete is that it provides benfotiamine — a lipid-soluble version of thiamine (B1) that can be more effective in raising bioavailable thiamine levels throughout your body than regular B1. (1) In other words, your body may find the benfotiamine that this supplement offers more useful than regular B1.

This product is also gluten-free, soy-free, and caffeine-free — plus, you only need to take one capsule per day with a light meal. 

Onnit Active B Complete
Onnit Active B Complete
Onnit Active B Complete

This B complex includes all eight essential B vitamins — vitamin B1, B2, B3, B5, B6, B7, B9, and B12, all of which are dosed at over 100 percent of your RDI (recommended daily intake). Plus, you only need to take one capsule each day. 

Who Should Buy Onnit Active B Complete

  • Anyone looking for a complete B complex will love that this product contains all eight essential B vitamins at over 100 percent of your RDI.
  • Folks who are looking for vitamin B1 in the form of benfotiamine to potentially increase its effectiveness will like the bioavailability of the B1 in this product.
  • For customers who prefer pills to liquid, this product comes in capsule form. 

Who Shouldn’t Buy Onnit Active B Complete

  • Those who want more than just B vitamins in their supplement can get a multivitamin that includes a B complex. 
  • Pill-averse buyers who would prefer to take a liquid B complex will probably want to look elsewhere.

If you’re looking for a B complex that doses all eight essential B vitamins at over 100 percent of your recommended daily intake, you’ve found it in Onnit Active B Complete.

Best Multivitamin with B Complex

The name says it all for the best multivitamin with B complex included in it. Huge Supplements Huge Multi gives you exactly what it implies — a wide array of essential vitamins, including all your essential B vitamins, to knock out all the nutritional gaps you may be looking to fill..

Huge Supplements Huge Multi

This multivitamin truly packs a punch. Each serving — consisting of four capsules — contains all eight of the essential B vitamins in very high concentrations. With 100 percent of your RDI for B7, all the way to 6,333 percent of your RDI for B1, you won’t miss out on any of your daily B Vitamin needs here.

Each bottle contains 120 capsules (30 servings), and the servings contain a wide variety of vitamins. You’ll get your B vitamins here, but also whopping doses of vitamins A, C, D, E, and K. Per serving, you’ll also be getting 90mg of calcium, 24mg of zinc, 60mg of magnesium, and more. For good measure, each serving also contains 200mg of ginger extract, which many athletes turn to for reducing inflammation.

Huge Supplements Huge Multi
Huge Supplements Huge Multi
Huge Supplements Huge Multi

This supplement packs 100 percent to 41,667 percent of the eight essential B vitamins into one dose. Plus, Huge Supplements includes over 30 essential vitamins and minerals overall, like vitamin K1, K2, and D, and zinc, magnesium, iodine, and calcium.

Who Should Buy Huge Supplements Huge Multi

  • If you want additional vitamins and minerals alongside your vitamin B supplementation, these capsules also include calcium, zinc, magnesium, selenium, L-taurine, and more.
  • Wellness aficionados who want to take an array of supplements to fuel and maintain their overall health will like that these capsules include pretty much everything they need.
  • When you want to cut down on the amount of supplements you’re taking and bring it all back to just one multivitamin, this product packs a punch. 

Who Shouldn’t Buy Huge Supplements Huge Multi

  • People who just want to supplement their vitamin B intake, and don’t need the additional vitamins and minerals can find simpler products.
  • Athletes who don’t like taking pills might want to go elsewhere to get their vitamin B complex supplements because there are four capsules per serving in this product.

If you’re ready to commit to a multivitamin that packs all you need — including your vitamin B complex — into a four-capsule serving, then Huge Supplements Huge Multi might be for you.

[Related: Intermittent Fasting 101: A Guide To Benefits, Muscle Gain, And More]

Best Vitamin B Complex for Vegetarians

For vegetarians and vegans looking to expand their supplement repertoire, it can be tough to find plant-based capsules that aren’t made of gelatin. But Swolverine Vitamin B Complex fits the bill.

Swolverine Vitamin B Complex

Providing over 100 percent of your RDI for each of the eight essential B vitamins, Swolverine Vitamin B Complex ensures that you’ll have every B vitamin you need to fuel your day. At 100mg, it provides a very high dose of thiamin, as well as 100mg each of niacin, riboflavin, and B6. Each serving consists of only one tablet, so you won’t have to go out of your way to take multiple doses for just one serving.

The Swolverine Vitamin B Complex tablet is made from cellulose, which makes it vegetarian- and vegan-friendly, and an excellent option for folks who need to avoid gelatin. The product is also non-GMO and soy-free, which is important for athletes who are avoiding soy, and want to minimize GMOs in their diet.

Swolverine Vitamin B Complex
Swolverine Vitamin B Complex
Swolverine Vitamin B Complex

Complete with a vegetarian-friendly tablet, Swolverine Vitamin B Complex offers well more than the RDI for each of the eight essential B vitamins — in only one tablet. Plus, it’s soy-free and non-GMO.

Who Should Buy Swolverine Vitamin B Complex

  • Any athlete who wants to avoid gelatin in their tablets or capsules, such as vegans and vegetarians, will appreciate this cellulose-based tablet.
  • This product contains well over the RDI for each of the eight essential B vitamins, providing athletes with more than enough of what they need.
  • If you don’t like taking multiple tablets per serving, you’re in luck — each high-dose serving of this product only consists of one tablet.

Who Shouldn’t Buy Swolverine Vitamin B Complex

  • People who would prefer a gummy option might want to choose something aside from a tablet.
  • Athletes looking to get multiple kinds of vitamins and minerals included with their vitamin B complex might want to turn to a multivitamin.

If you’re a vegetarian or vegan looking for a vitamin B complex you can take confidently, you can turn to Swolverine Vitamin B Complex’s cellulose-based tablet. 

Best B Vitamin Gummies

You might be looking for a gummy instead of a capsule to meet your vitamin B complex needs. In that case, Nature’s Way Alive B-Complex Gummies will give you all eight essential B vitamins, plus a fruit and veggie blend that can provide an important boost of real food.

Nature’s Way Alive B-Complex Gummies

This pick comes in gummy form, which — in our opinion — is one of the most delicious ways to take a B vitamin supplement. Plus, it still packs all eight B vitamins in each two-gummy dose.

This vegetarian B complex contains all eight B vitamins, including 3.4mg of vitamin B6 and 12mcg of vitamin B12. On top of the B complex, Nature’s Way also provides 150mg of a fruit and veggie blend — this includes powders from foods like asparagus, spinach, cauliflower, blueberries, pineapple, and more. You’ll also find vitamin C, niacin, and folate in these chews.

These gummies come in a mango flavor, which is brought to you by three grams of added sugar and 20 calories per dose.

Nature's Way Alive B-Complex Gummies
Nature's Way Alive B-Complex Gummies
Nature's Way Alive B-Complex Gummies

These gummies contain 3.4mg of vitamin B6 and 12mcg of vitamin B12. On top of the B vitamins, Nature's Way also provides 150mg of a fruit and veggie blend.

Who Should Buy Nature’s Way Alive B-Complex Gummies

  • For anyone looking for high doses of vitamin B6 and vitamin B12, this product contains 200 percent and 500 percent of your recommended daily intake for each, respectively. 
  • If you want an added blend of fruits and veggies in your B complex, these gummies contain 150mg of a food-based fruit and veggie powder blend. 
  • Vegetarians who want a B complex supplement that’s made from plant-based ingredients will be happy that these gummies are made from pectin, not gelatin.

Who Shouldn’t Buy Nature’s Way Alive B-Complex Gummies

  • Those who don’t want any added sugar in their B complex may be better off grabbing a capsule supplement. 
  • Folks who want more than one flavor option might be disappointed that these gummies only come in a mango flavor. 

Competitively priced and offering a great dose of B vitamins, this supplement only requires you to take two mango gummies per serving. Plus, these gummies are much tastier than a couple of pills would be.

Best Vitamin B Complex for Quality

Onnit Active B Complete packs in all the essential B vitamins you need without adding anything extra to the mix. And because Onnit products are third-party tested for purity, you know you’re getting a high-quality product.

Onnit Active B Complete

Each serving of Onnit Active B Complete provides over 100% of your RDI for all eight essential B vitamins. And with a serving size of only one capsule — many other products have more than one capsule per serving — this complex is relatively easy to take.

Because this is an Onnit product, you can rest assured that it’s high-quality, as it’s tested for purity and banned substances by third parties. This will be a relief to competitive athletes who need to be able to take their vitamins with confidence that they won’t fail a drug test because of it.

This B complex is also unique because it provides B1 in the form of benfotiamine, which research suggests may be more readily available for your body to use than regular B1. (1) To put it another way, B1 might be more effective in your body when you get it from benfotiamine.

Onnit Active B Complete
Onnit Active B Complete
Onnit Active B Complete

This B complex includes all eight essential B vitamins — vitamin B1, B2, B3, B5, B6, B7, B9, and B12, all of which are dosed at over 100 percent of your RDI (recommended daily intake). Plus, you only need to take one capsule each day. 

Who Should Buy Onnit Active B Complete

  • Onnit products are high-quality, because they’re tested for purity and banned substances by third parties — so if you need to take your vitamin B complex feeling confident that you can safely compete, this might be the product for you.
  • If you want to make sure your B vitamins are extra easy for your body to take in, you’ll appreciate that this product uses benfotiamine for B1.
  • Each serving size is only one capsule, which is fewer pills to swallow per serving compared to several other options on the market.

Who Shouldn’t Buy Onnit Active B Complete

  • If you’re looking to get a vitamin B complex that comes with other vitamins and minerals, you might want to turn to a multivitamin instead. 
  • Don’t like pills? You may want to avoid any capsules completely.

When you want to make sure that your vitamin B complex is high quality — and third-party tested — look no further than Onnit Active B Complete.

[Related: The Best Types Of Supplements For Performance, Weight Loss, And Health]

Best For Vitamin C

Sometimes, you don’t just need all your B vitamins in the same place — you may want vitamin C to join the party, as well. When that’s the case, Nature Made Super-B Complex Tablets give you all the B vitamins and vitamin C that you need.

Nature Made Super-B Complex Tablets

Each one-tablet serving contains over 100 percent of the recommended daily value for each of the Vitamin B compounds included. Nature Made includes a particularly strong dose of thiamin, with 10mg included. Each tablet also contains 12mcg of B12 and 5mg of B6.

In addition to the vitamin B available in these tablets, each serving contains 500 milligrams of vitamin C as ascorbic acid. The tablets also have 13.5mg of vitamin E, 100mg of niacin, and 23.9mg of zinc for when you’re looking to diversify your vitamin and mineral intake with one tablet. Just be sure to take these tablets with water and a meal.

Nature Made Super-B Complex Tablets
Nature Made Super-B Complex Tablets
Nature Made Super-B Complex Tablets

Folks looking for a straightforward source of Vitamin B with an additional kick of Vitamin C may want to check out Nature Made Super-B Complex Tablets. Available at a very reasonable price point, each bottle contains a 140 day supply of Vitamin B Complex.

Who Should Buy Nature Made Super-B Complex Tablets

  • Anyone looking for a nice boost of vitamin C will like that this product contains 556 percent of your RDI for vitamin C per serving.
  • Folks who desire to up their thiamin intake will appreciate the 10mg of thiamin in these tablets.
  • Athletes who like getting their vitamins through tablets rather than capsules or gummies might enjoy the texture this product offers.

Who Shouldn’t Buy Nature Made Super-B Complex Tablets

  • Athletes who are looking for a supplement that only contains B vitamins might choose a different option.
  • Folks looking for high label accuracy might want to choose a different supplement — this product scores low on label accuracy on Labdoor.

According to independent testing conducted by Labdoor, Nature Made Super-B Complex Tablets score high on purity, but quite low on label accuracy. However, since there isn’t much to knock this product on beyond label accuracy, it still places high in our rankings.

[Related: Nutrition For Bulking: 10 Tips For Intelligent Muscle Gain]

Best Raw Probiotic and Enzyme Blend

If you’re looking for a vitamin B complex that can offer probiotics and enzymes in addition to your typical vitamins, you’ll want to check out Garden of Life’s Vitamin B Complex.

Garden of Life’s Vitamin B Complex

Each serving of Garden of Life’s Vitamin B Complex includes strong doses of all eight vitamin B compounds, highlighted by a particularly large amount of B12. Supplementing the vitamin B in Garden of Life’s recipe is 360 milligrams of a raw and organic fruit and vegetable blend, featuring apples, beets, broccoli, and carrots, to name a few. 

In each two capsule serving, there are 60 milligrams of a probiotic and enzyme blend intended to aid in digestive support. This product also scores high for product purity on Labdoor. It is vegan-friendly and non-GMO project verified. And, if you’re following a low-carb diet, you’ll be happy to know that the fruit and veggie blend does not add any calories via carbohydrates.

Garden of Life Vitamin B Complex
Garden of Life Vitamin B Complex
Garden of Life Vitamin B Complex

In addition to a strong smattering of vitamin Bs, Garden of Life bolsters their complex with a unique blend of raw organic fruits and vegetables and a raw probiotic and enzyme blend. Intended to provide additional nutrients and digestive support, this unique recipe sets this offering apart from the competition. 

Who Should Buy Garden of Life’s Vitamin B Complex

  • Athletes interested in the nutritional value added by a strong fruit and veggie blend will appreciate getting all eight essential B vitamins with a side of fruits and veggies.
  • People with a goal of better digestive support will like that this product has 60 milligrams of a probiotic and enzyme blend.
  • If you want a vegan-friendly, non-GMO product with a high-purity score, this Vitamin B Complex might be the one for you.

Who Shouldn’t Buy Garden of Life’s Vitamin B Complex

  • Pill-averse folks might want to avoid this complex, as each serving contains two capsules.
  • If you’re looking for a bare-bones vitamin B complex, you can find simpler options.

On a per-serving basis, Garden of Life’s offering is a bit more expensive than some of the competing brands on the market, so it might price out some customers. However, those who are looking for the added nutritional value of a robust fruit and veggie blend could benefit from this product.

[Related: The Lifter’s Guide To Magnesium: What This Nutrient Does For Strength]

Different Types of B Vitamins

There are eight essential B vitamins that most complexes will include that can help with energy levels and cell metabolism. A little more information about each specific B vitamin follows.

B1 (Thiamin)

Thiamin typically can help your body digest food and release its energy for use. It can be found naturally in peas and nuts. (2)

B2 (Riboflavin)

Riboflavin can help your body release energy from food, while potentially helping your eyes, skin, and nervous system. Mushrooms, yogurt, milk, and eggs contain vitamin B2. (3)

B3 (Niacin)

Niacin can help the nervous system and skin while also aiding in digestion by allowing your body to release the energy obtained from food. Wheat flour, eggs, fish, and meat contain niacin. (4)

B5 (Pantothenic Acid)

Pantothenic acid can also help the body release the energy that food gives you. Avocado, mushrooms, eggs, chicken, and beef all contain pantothenic acid. (5)

B6 (Pyridoxine)

Pyridoxine may help you store energy and form the oxygen-carrying substance haemoglobin. Oats, soy beans, bananas, peanuts, pork, chicken, and turkey all contain pyridoxine. (6)

B7 (Biotin)

Biotin can help your body make fatty acids. You can find it in nuts, seeds, legumes, and liver. (7)

Folate and Folic Acid

Folic acid is the human-made form of folate, which can help form red blood cells in your body. Folate is found in broccoli, leafy greens, peas, chickpeas, and kidney beans. (8)

B12

Vitamin B12 may help release energy from food and also assist in making red blood cells. It can be found in milk, eggs, cheese, fish, meat, and nutritional yeast. (9)

Benefits of B Vitamins

In all its specific forms, vitamin B can help your body extract energy from food while also boosting your cellular functions. We get into more of the details below. 

Energy Levels

Vitamin B — especially B6, pantothenic acid, thiamin, riboflavin, and B12 — can help your body break down food. The process of digestion is about extracting energy from what you’re eating to fuel your body’s functions. By assisting with digestion and the breakdown of food, vitamin B can play a role in maintaining and boosting your body’s energy levels by helping to make more energy available to you after eating. (10)

Cellular Functions

B vitamins like folate and biotin can help in more specific cellular processes that don’t necessarily relate to digestion. Biotin may aid in the production of fatty acids while folate (or folic acid, when it comes from supplements) and B12 may help you develop red blood cells. (11) Vitamin B6, otherwise known as pyridoxine, can also help with haemoglobin production. (12) All of these cellular processes can help keep your body in the shape you need it to be to keep functioning.

When Should I Take a Vitamin B Complex?

Many vitamin B complex supplements recommend taking your capsule, tablet, or gummy with a meal. Since it can help with energy production through digestion, you might want to take your supplement with a morning meal, so that you aren’t getting an energy boost right before bedtime.

How We Chose The Best Vitamin B Complexes

With so many vitamin B complexes to choose from, we wanted to make sure we were showing you the best of the best — we weighed dosage, purity, cost — and more — when building out this list. 

Dosage

When comparing vitamin B complex options, one of the biggest differences will come down to dosage amounts. Not all brands include the same amounts of each vitamin, and it’s important to pay special attention to the nutrition facts in order to line them up with the needs of your particular diet.

There isn’t a standard combination of vitamin B dosages that any of these products follow nor is there one set for the market-at-large. Knowing what daily percentage increase you’re aiming for with each vitamin will help better isolate the best option for you. We have included options with a variety of dosages to ensure that no matter what you’re aiming for, there’s a pick on this list to match. 

Purity

When shopping for any supplement, it’s important to know what’s inside each bottle. Labdoor is a good resource for independent third-party testing and can give a sense of how accurate each nutritional label is. Additionally, it is usually a good move to check to see that there aren’t any unnecessary or artificial ingredients added to the complex’s recipe. When we included a product that’s third-party tested, we mentioned it here to eliminate some of that work for you. 

[Related: Does The Ketogenic Diet Work For Strength Training?]

Additional Features

Almost all vitamin B complex supplements will include some amount of each of the eight B vitamins. However, some will also add additional ingredients, such as vitamin C or other natural ingredients, in order to differentiate themselves from the rest of the market. Depending on dietary needs, this may be appealing. We’ve included both plain B complexes, as well as B complexes with additional ingredients on this list to meet an array of customer needs. 

Form

Vitamin B complex is commonly available in capsule or tablet form. It can also be found as a gummy, if you are someone who is really opposed to swallowing pills. Determining which form is better will ultimately come down to personal preference or lifestyle, as the nutritional value presented in these products does not necessarily change based on the form it is served in. For this reason, we included a variety of forms here, so you can pick one based on your preferences. 

Cost

To determine the cost of a product, divide the total cost of each supplement by the number of servings in that container. That will give you a specific value for each serving to directly compare products. There are a wide range of prices on this list, so you should be able to find a product that meets every budget. 

What To Consider Before Buying Vitamin B Complexes

Vitamin B complex supplements are typically made up of eight types of B vitamins, all of which play unique roles in regulating many bodily functions. While many get enough of these vitamins by eating a well-balanced diet, folks in certain populations may benefit from supplementation. This includes pregnant people and those following a strict vegan diet (especially if they don’t like nutritional yeast). Before deciding if a B complex is the right move, consider some of these key elements. 

Life Circumstances

Since energy levels can be difficult to regulate when a person is pregnant — and because folate and folic acid can help reduce the risk of certain birth irregularities — you might want to chat with your doctor about taking a vitamin B complex if you’re pregnant. 

Current Diet

There are plenty of vegan and vegetarian sources of most essential forms of vitamin B. But if you’re a vegan who doesn’t like nutritional yeast — which is generally supplemented with B12 — you may have difficulty getting all of the essential B vitamins into your diet. In that case, you might opt for a supplement.

Even if you aren’t vegan, and you feel you may not be getting enough B vitamins in your diet, or you feel low in energy, you may speak to a physician to see if a B complex is the right move for you. 

Form and Flavor

Some folks absolutely cannot stand swallowing capsules. For others, tablets are unbearable. Still others don’t want the extra calories or sugar that might be associated with gummies. Whichever camp you fall into, there are a few options out there for you to choose between. With vitamin B complexes, most of those options are capsules, but there are a few gummy and tablet options as well. Sometimes you can even find a greens powder with B vitamins. Pick your priorities in form/flavor before digging into your options. 

[Related: Best Macros Calculator For Tracking Muscle Gain And Fat Loss]

Final Word

When considering turning to supplementation, always consult a medical professional first. Many folks receive enough vitamin B if they eat a diversified diet. But if you’re pregnant or tend to stick to a vegan diet, you may not be getting the proper amount of B vitamins. 

Be sure to weigh your diet, lifestyle, and flavor/form preferences before diving into this list. But once you’ve chosen your path, this list should be able to guide you to the right B complex for you. Just remember: Try to be consistent when taking vitamin B complex, as it can be more difficult to ascertain the effectiveness of any vitamin if it’s not taken at the same time every day.

FAQs

What is vitamin B complex good for?

All B vitamins play key roles in maintaining overall health, functioning in everything from cell health to energy storage. While many receive enough B vitamins from a well-balanced diet, some benefit from vitamin B supplementation. 

Do B vitamins keep you up at night?

While some B vitamins may help produce energy, other B vitamins help maintain overall cellular health. When combined with a healthy diet and exercise, B vitamins may even aid some folks in falling asleep. 

Is vitamin B good for skin?

There are several different types of vitamin B, some of which may have positive effects on skin. If you’re struggling with skin health, it may be wise to consult a dermatologist of a medical professional. 

References

  1. Xie F, Cheng Z, Li S, Liu X, Guo X, Yu P, Gu Z. Pharmacokinetic study of benfotiamine and the bioavailability assessment compared to thiamine hydrochloride. Journal of Clinical Pharmacology. 2014 Jun;54(6):688-95.
  2. Martel JL, Kerndt CC, Doshi H, Franklin DS. Vitamin B1 (Thiamine). 2021 Sep 7. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2021 Jan.
  3. Suwannasom N, Kao I, Pruß A, Georgieva R, Bäumler H. Riboflavin: The Health Benefits of a Forgotten Natural Vitamin. Int J Mol Sci. 2020 Jan 31;21(3):950.
  4. Peechakara BV, Gupta M. Vitamin B3. [Updated 2021 Jun 15]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2021 Jan.
  5. Sanvictores T, Chauhan S. Vitamin B5 (Pantothenic Acid) [Updated 2021 Aug 3]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2021 Jan.
  6. Spinneker A, Sola R, Lemmen V, Castillo MJ, Pietrzik K, González-Gross M. Vitamin B6 status, deficiency and its consequences–an overview. Nutr Hosp. 2007 Jan-Feb;22(1):7-24.
  7. Zempleni J, Wijeratne SS, Hassan YI. Biotin. Biofactors. 2009 Jan-Feb;35(1):36-46.
  8. Ebara S. Nutritional role of folate. Congenit Anom (Kyoto). 2017 Sep;57(5):138-141.
  9. Ankar A, Kumar A. Vitamin B12 Deficiency. 2021 Jun 7. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2021 Jan.
  10. Tardy AL, Pouteau E, Marquez D, Yilmaz C, Scholey A. Vitamins and Minerals for Energy, Fatigue and Cognition: A Narrative Review of the Biochemical and Clinical Evidence. Nutrients. 2020 Jan 16;12(1):228.
  11. Koury MJ, Ponka P. New insights into erythropoiesis: the roles of folate, vitamin B12, and iron. Annu Rev Nutr. 2004;24:105-31.
  12. Brown MJ, Ameer MA, Beier K. Vitamin B6 Deficiency. [Updated 2021 Jul 25]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2021 Jan.