Does biotin cause acne?

Biotin (vitamin B7) is widely taken for hair and nails, and high-dose biotin supplements are anecdotally linked to breakouts. The proposed mechanism is that large amounts of biotin may compete with pantothenic acid (B5) for absorption, and B5 is involved in skin health. The evidence is limited and mostly anecdotal.

Biotin from food is not a concern; this is about mega-dose supplements (often 5,000–10,000 mcg).

What the research says

There are no clinical trials linking biotin to acne; the connection is anecdotal. The commonly repeated mechanism — that high-dose biotin competes with vitamin B5 (pantothenic acid) for absorption — is a hypothesis, not an established finding.

What's clearer is that you rarely need mega-dose biotin (5,000–10,000 mcg) unless a doctor advised it, and biotin from food is not a concern.

What you can do

• If you started a biotin supplement and then broke out, trial stopping it.
• You rarely need high-dose biotin unless a doctor advised it.
• Reassess all new supplements when troubleshooting acne.

Bottom line

The biotin–acne link is anecdotal and tied to high-dose supplements. If you started one and then broke out, trialling stopping it is harmless and worth doing.

Vet your skincare too

Diet is only one piece. Many breakouts are driven by what you put on your skin. Paste your products into our comedogenic ingredient checker to rule out pore-clogging ingredients, and check for fungal-acne triggers if your bumps are small and itchy.

Sources & further reading

• No controlled studies establish this link; the evidence is anecdotal or theoretical and is described as such above.
• American Academy of Dermatology — acne resources

By Mitchell Zandwijken · Last updated July 2026. See our sources & methodology.