Across 101 first-hand reports, people mentioned a side effect 15 times (about 15 per 100 reports). The most common: acne, lab test, vivid hallucinations. User reports show what people notice — they can't tell you whether Biotin is safe for you.
“I stg I didn't have such chronic skin issues until I tried biotin. biotin seems to trigger them to go crazy.”
“I definitely stopped drinking the kind with insane biotin as it appeared to cause acne by reducing b5 uptake”
“I take biotin 1000mg (my nails suck but it hasn't done a thing for them and I'm still hopeful)”
“it just gave me expensive acne and a weird sense of betrayal”
“Too much B6 and Biotin makes my acne go crazy.”
Conclusion: This guideline should enable addressing suboptimal and deficient status of a bundle of MNs in at-risk diseases. In particular, it offers practical advice on MN provision and monitoring during nutritional support.