Biotin: A Science-Based Guide
What is biotin?
Biotin is a water-soluble B vitamin, also known as vitamin B7 or vitamin H. The name "H" comes from the German words "Haar und Haut" (hair and skin), referencing its historical association with these tissues.
Biotin is an essential coenzyme involved in several metabolic processes. The body requires biotin in small amounts, but it is indispensable for normal metabolism. Biotin is obtained both from food and from dietary supplements.
As a supplement, biotin is available in tablets, capsules, and gummies, and is often included in beauty and hair complexes. In the European Union, only EFSA-approved health claims may be used in the marketing of biotin supplements.
How does it work?
Biotin functions as a coenzyme in carboxylase reactions — these are enzymatic processes that add a carboxyl group (-COOH) to substrates. This is an essential role in several metabolic pathways.
Specifically, biotin is involved in:
- Fatty acid synthesis — acetyl-CoA carboxylase requires biotin
- Gluconeogenesis — pyruvate carboxylase uses biotin to produce glucose
- Amino acid catabolism — propionyl-CoA carboxylase requires biotin
- Macronutrient metabolism — biotin is necessary for the normal processing of carbohydrates, fats, and proteins
Because biotin is water-soluble, the body does not store it in large quantities. Excess biotin is excreted in urine.
Supported benefits (EFSA-approved claims only)
The following benefits are based on health claims authorised under Commission Regulation (EU) No 432/2012. All claims are valid when the supplement provides at least 7.5 micrograms (15% of the Nutrient Reference Value) of biotin per 100 g, 100 ml, or per serving:
Hair
- Biotin contributes to the maintenance of normal hair — this is an EFSA-approved claim. Note that it is not permitted to say "prevents hair loss" or "makes hair grow faster".
Skin
- Biotin contributes to the maintenance of normal skin — related to biotin's role in normal cell function. It is not permitted to say "cures skin problems" or "anti-aging".
Energy metabolism
- Biotin contributes to normal energy-yielding metabolism — biotin participates in enzymatic processes that convert nutrients into energy.
Nervous system
- Biotin contributes to normal functioning of the nervous system — related to biotin's role in neurological processes.
Macronutrient metabolism
- Biotin contributes to normal macronutrient metabolism — biotin is a coenzyme in the metabolism of carbohydrates, fats, and proteins.
Important note: Claims such as "prevents hair loss", "makes hair grow faster", "anti-aging", or "cures skin problems" are not permitted. These are either oversimplified or medical claims that may not be used for food supplements.
Natural sources
Biotin is found in many foods:
- Eggs (especially egg yolk) — one of the richest sources of biotin
- Nuts — especially almonds and peanuts
- Seeds — sunflower seeds, sesame seeds
- Liver — beef and chicken liver
- Fish — salmon, sardines
- Sweet potato
- Spinach and broccoli
- Whole grains
- Dairy products
It is important to note that raw egg white contains avidin, which binds biotin and prevents its absorption. Heat treatment (boiling, frying) inactivates avidin.
Available forms
Biotin supplements are available in several forms:
- Tablets — the most common and often the most affordable form
- Capsules — easy to swallow, often with good bioavailability
- Gummies — flavoured, popular among those who do not like swallowing tablets
- Beauty and hair complexes — biotin combined with other vitamins and minerals (zinc, vitamin C, etc.)
The form is a matter of personal preference. Always check the biotin content per serving on the label.
How to take it
- Always follow the recommended daily serving stated on the label — do not exceed it
- Biotin can be taken at any time of day, with or without food
- Because biotin is water-soluble, excess amounts are excreted in urine — the body does not store it
- Take biotin tablets or capsules with a glass of water
- Biotin can generally be combined with other supplements
- If you take medications, consult a doctor — some medications may affect biotin absorption
Note about laboratory tests: Taking biotin in high doses may affect certain laboratory test results (especially thyroid and hormone tests). Inform your doctor about biotin supplementation before blood tests.
Who uses biotin supplements?
Biotin supplements may be relevant for:
- Adults who want to support the maintenance of normal hair and skin (EFSA-approved)
- People who wish to add vitamin B7 to their nutrition plan
- People with restricted diets (e.g., strict diets, food groups excluded due to allergies)
- Fitness enthusiasts who want to support normal energy-yielding metabolism
Biotin is generally well tolerated and side effects are rare, as excess amounts are excreted in urine.
Frequently Asked Questions
Does biotin help with hair growth?
EFSA has confirmed that biotin contributes to the maintenance of normal hair (provided the product contains at least 7.5 ug per serving). Claims such as "makes hair grow faster" or "prevents hair loss" are not approved.
How much biotin should I take?
Always follow the recommended dosage on the product label. The Nutrient Reference Value (NRV) for biotin is 50 ug per day. Supplements often contain higher amounts, but the recommended serving is stated on the product.
Can I take too much biotin?
Because biotin is water-soluble, excess amounts are excreted from the body in urine. However, you should follow the recommended dosage. High biotin intake may affect certain laboratory test results — inform your doctor about biotin use.
When will I see results from a biotin supplement?
Biotin contributes to the maintenance of normal hair and skin on a daily basis. A specific time frame has not been evaluated or approved by EFSA. Supplements are not intended for rapid visible changes.
Is biotin suitable for vegans?
Many biotin supplements are suitable for vegans, but always check the product label. Capsule shells may contain gelatin (animal origin). Look for products labelled as vegan-friendly.
Can I take biotin with other vitamins?
Yes, biotin can generally be combined with other supplements. Many beauty and hair complexes already contain biotin alongside other vitamins and minerals. Check your total vitamin B7 intake to avoid double-dosing from multiple sources.
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See also:
- Multivitamins: A Complete Guide to Vitamin and Mineral Supplements
- Supplements for Hair Loss and Thinning
- Best Supplements for Women Over 40
Important information
Toidulisand ei asenda mitmekesist ja tasakaalustatud toitumist ega tervislikku eluviisi.
A food supplement is not a substitute for a varied and balanced diet and a healthy lifestyle.
Биологически активная добавка не является заменой разнообразного и сбалансированного питания и здорового образа жизни.
