A Beginner's Guide To Biotin: 9 Healthy Benefits, Uses & More

Functional Medicine Practitioner By William Cole, D.C., IFMCP
Functional Medicine Practitioner
Dr. Will Cole, D.C., IFMCP, is a leading functional medicine expert who specializes in clinically investigating underlying factors of chronic disease and customizing a functional medicine approach for thyroid issues, autoimmune conditions, hormonal imbalances, digestive disorders, and brain problems. Cole is also the bestselling author of Ketotarian and The Inflammation Spectrum.
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Your body is a well-oiled machine. Without proper maintenance and fuel, machines begin to slowly break down, and problems start to arise. An adequate well-rounded amount of nutrients are to your body like oil is to a machine. B vitamins, in particular, play a crucial role in helping your body function optimally. One of those is biotin.  

What is biotin? 

Biotin is a type of vitamin B. Unlike vitamin C or vitamin D, there are many types of B vitamins that each play their own important role in maintaining how your body functions. In particular, vitamin B7—biotin—stands apart from the rest with its role in keeping skin, hair, and nails healthy and looking vibrant and healthy.*

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How does biotin work in the body? 

Many delicate, intricate pathways like methylation—your body's biochemical superhighway, a process that happens more than 1 billion times every single second—are fueled by B vitamins. It is responsible for helping to decrease the body's inflammatory response and also help to aid your body in breaking down fats, proteins, and carbohydrates for energy production.

Your body cannot synthesize biotin, so it must be obtained through diet, supplementation, and intestinal bacteria.* Any protein-bound biotin from your food ends up being converted to free biotin, which is then absorbed within the small and large intestine. Once absorbed, it is then moved into the systemic circulation, picked up by the liver, to finally cross the blood-brain barrier into the central nervous system.

Biotin deficiency. 

Since biotin is found in many different kinds of food, severe deficiencies in this nutrient can be rare—however, it can happen.

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You may also be at risk for biotin deficiency if you:

Symptoms of biotin deficiency.

If you suspect a deficiency, symptoms can include:

  • Fatigue
  • Brittle hair
  • Hair loss
  • Digestive issues
  • Dry skin
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Why you should be concerned about biotin deficiency.

Biotin is considered a coenzyme for carboxylases, which are enzymes that assist in metabolizing fats, carbohydrates, and proteins for energy production and processes such as gluconeogenesis, insulin release, fatty acid synthesis, and the use of branched-chain amino acids to produce neurotransmitters.

Low levels of biotin can become a problem when your metabolism is concerned. Metabolism is your body's internal process that turns whatever food you eat into usable energy, and any food that is not used for energy is stored as fat. Because biotin is needed for the proper function of this process, you can end up with a whole slew of health problems including fatigue, weight gain, and weight loss resistance.

9 benefits of biotin.

While a lot of the buzz around biotin focuses mainly on its ability to aid in enhancing appearance, there are many more aspects of your health in which biotin plays a significant role:

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1. Supports hair health.*

Thinning hair and hair loss are very common symptoms and can be supported with the addition of biotin.* This is especially true if you have low levels of biotin—which has been shown to lead to hair loss. Additionally, biotin is believed to naturally support healthy hair growth because it is involved in the production of keratin, the main component of hair.* In one small study, women with thinning hair reported significant regrowth when supplementing with biotin as compared to those given a placebo.* Biotin supplementation has not been extensively studied for hair growth, though, and evidence is limited.

2. Supports skin health.*

Biotin is right there at the front line to fight the effects of aging with its role in fatty acid synthesis, which is crucial for healthy skin.* The cells in your skin depend heavily on fat production for added protection against damage from constant exposure to wind, sun, and other harsh everyday environmental factors.*

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3. Promotes nail strength.

Brittle, rigid nails are another common complaint, especially for those with vitamin deficiencies. Biotin has been shown to support thickness and firmness of nails.*

4. Supports immune health.*

Biotin is essential for maintaining the development of white blood cells.* These are the defense mechanisms of your immune system and work to protect your body against viruses and bacteria that make you sick. Your body actually contains two different types of white blood cells, called TH1 and TH2. Almost like a seesaw, TH1 and TH2 need to balance each other. When one becomes dominant, it can trigger an inflammatory response in your body.

One reason this can happen is a lack of T-regulatory cells, which work to maintain balance.* Biotin deficiency is associated with T-cell decay.*

5. Supports brain function.*

Biotin, along with other B vitamins, plays a role in neurotransmitter activity and protects against neurodegenerative disorders like age-related cognitive decline and overall aids in supporting cognitive function.* It also helps to maintain mood due to their role in synthesizing hormones responsible for a positive mood.* Deficiency in biotin can lead to neurological problems, which has biotin supplementation has been shown to support.*

6. Maintains healthy levels of blood sugar.* 

Since biotin supports insulin production and stimulates glucokinase—an enzyme in the liver that promotes glycogen synthesis—it helps to maintain blood sugar levels.*

7. It can act as an anti-inflammatory.*

Studies have shown that biotin deficiency can increase pro-inflammatory cytokines and contribute to inflammation. It works by activating the inflammatory nuclear factor kappa B (NF-kB for short), which binds to your DNA and triggers a number of inflammatory cascades throughout the body. Research has shown that supplementing with biotin can maintain healthy levels of these pro-inflammatory cytokines.*

8. Supports heart health.*

Biotin is needed for fat metabolism, which is important for thriving heart health. It can also work in conjunction with chromium to reduce LDL levels and increase HDL since inverse levels of each are markers for increased risk of heart disease. Research has shown that a dose of 15,000 mcg a day of biotin can also maintain healthy blood triglyceride levels.*

9. Supports nutrient breakdown in the body.*

In every cell of your body, biotin helps break down the nutrients (protein amino acids, carbohydrates, and fatty acids) from your food for fuel. B7 is also über-important whenever we are doing different forms of fasting (such as intermittent fasting) or if you are in a ketogenic state (nutritional ketosis or fat burning). During these metabolic states, biotin is needed to support new glucose for fuel through gluconeogenesis.*

Are there any side effects of taking biotin?

Overall, biotin is a safe vitamin that has relatively few, if any, side effects. It is typically very difficult to even overdose due to the fact that it is water-soluble, and any excess amounts are released through your urine. But with any type of supplementation, we recommend regular monitoring with diagnostic labs. For some people, extremely high doses of biotin can throw off thyroid test results and mimic Graves' disease in lab work. So it's important to know where you stand in regards to your health so you and your doctor are aware of any potential implications. Knowledge is power. Especially when it comes to your health!

How to include biotin in your everyday life:

The National Institutes of Health recommends an adequate intake (AI) for each age group of:

  • Birth to 6 months: 5 mcg
  • 7 to 12 months: 6 mcg
  • 1 to 3 years: 8 mcg
  • 4 to 8 years: 12 mcg
  • 9 to 13 years: 20 mcg
  • 14 to 18 years: 25 mcg (30 to 35 mcg if pregnant and lactating)
  • 19+ years: 30 mcg


You can support healthy biotin levels through your diet with these foods:

  • Beef liver: 30 mg to 3 oz.
  • Eggs: 13 mg to 1 whole
  • Salmon: 5 mg to 3 oz.
  • Avocado: 2-6 mg to 1 whole
  • Cheese: 0.4-2 mg to 1 oz.
  • Brewer's or Nutritional Yeast: 1.4-14 mcg to 7 grams

Spirulina is also another rich food source of a variety of B vitamins that is also plant-based. Found in both fresh and saltwater lakes throughout the world, it has been used as a highly revered food and remedy in ancient civilizations such as Mexico and Africa. When it comes to vitamin B content, it is second to none. It also contains all nine essential amino acids—the ones your body can't make and you have to get from food. 


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The ultimate trifecta: Gut-healer, protein booster & beauty enhancer, featuring biotin.*

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If you are interested in taking a supplement, biotin is usually part of all B-complex vitamins that contain all types of B vitamins such as B12, B6, niacin, and riboflavin since B vitamins all work together to support methylation, brain function, and more.* It's also often paired with collagen to further support the skin and hair benefits.* Since high doses of biotin are eliminated from circulation through urine, it is best to maintain a lower supplemental dose.

Beef-Liver Mexican Egg Scramble

Here is an easy recipe to get in some of the highest biotin foods all on one plate!


  • 1 cup ground beef liver
  • 4 eggs
  • ½ red onion, chopped
  • 1 jalapeño, seeded and chopped (optional)
  • Sea salt and pepper to taste
  • 1 teaspoon garlic powder
  • 1 teaspoon ghee
  • 1 small handful fresh cilantro, chopped
  • 1 whole avocado, pitted and sliced
  • Favorite salsa


  1. Heat ghee in skillet over medium heat.
  2. Add onions and jalapeño, and cook until soft.
  3. Add ground beef liver with sea salt, pepper, and garlic, and cook until done.
  4. Beat eggs in a separate bowl, add to skillet, and cook until done.
  5. Place egg scramble on plate and top with salsa, cilantro, and sliced avocado.
William Cole, D.C., IFMCP
William Cole, D.C., IFMCP
Will Cole, D.C., IFMCP, is a leading functional-medicine expert and a Doctor of Chiropractic. He...
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William Cole, D.C., IFMCP
William Cole, D.C., IFMCP
Will Cole, D.C., IFMCP, is a leading functional-medicine expert and a...
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