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ingestible · for hair loss & scalp health

Biotin (Vitamin B7)

Reviewed by the Nimbera editorial team · Last updated May 2026

Patel et al. 2017 Skin Appendage Disord (PMID 28879195) - Review of 18 reported cases of biotin supplementation for hair and nail changes found all cases showed clinical improvement; however, all cases also had an underlying cause of biotin deficiency or a condition affecting biotin metabolism, and the authors concluded there is a lack of sufficient evidence for supplementation in individuals without confirmed deficiency.$8-15/month

How to use

If biotin supplementation is chosen, typical doses range from 2,500-5,000 mcg (2.5-5 mg) daily, taken with food. Have serum biotin levels or biotinidase activity tested first if possible. Allow 3-6 months of consistent supplementation before evaluating effects on hair. Note that RDA for biotin is only 30 mcg/day - supplemental doses are many times higher.

How it works

Biotin is a water-soluble B vitamin essential for keratin synthesis, the structural protein that makes up hair, skin, and nails. It serves as a coenzyme for carboxylases involved in fatty acid synthesis and amino acid metabolism. Deficiency causes alopecia, but most people eating a varied diet are not deficient; supplementation in non-deficient individuals likely provides no measurable benefit.

Where to buy

Nature's Bounty Biotin 10,000 mcg (~$12 / 120 softgels), Natrol Biotin 5,000 mcg (~$10 / 100 tablets), Sports Research Biotin 5,000 mcg with coconut oil (~$15 / 120 softgels). Also widely available as generic store-brand options for under $8 / 60 tablets.

Typical cost: $8-15/month

Safety notes

High-dose biotin (>5,000 mcg/day) can cause falsely abnormal thyroid, troponin, and hormone lab results - inform all healthcare providers of supplementation before bloodwork. Does not appear to cause toxicity but can mask true lab values, potentially delaying diagnosis. Not effective for hair loss unrelated to biotin deficiency. Rare side effects include acne and GI upset at high doses.

Drug & supplement interactions

  • Always tell your doctor or pharmacist about any supplements you take.
  • Interactions can occur with prescription medications, blood thinners, and immunosuppressants.
  • Herbal remedies can affect how the body absorbs or metabolises drugs.
  • Check drugs.com interactions checker before starting.

Clinical source

Patel 2017 - Skin Appendage Disord (PMID 28879195)

This information is compiled from primary clinical literature and is for informational purposes only. It is not a substitute for professional medical advice. Read our full disclaimer.