Only if you are actually deficient - and a systematic review found biotin monotherapy showed no consistent benefit on objective hair growth, with no biotin-level differences between hair-loss patients and controls in telogen effluvium.
The more important warning: high-dose biotin skews lab immunoassays, including thyroid and troponin - tell your clinician before any blood draw. Real deficiency (malabsorption, certain medications, rare genetic conditions) is a lab diagnosis, not a guess. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper .
What to do
Common questions
Does biotin work for hair growth?
Only if you are actually deficient - and real deficiency is rare in anyone eating a normal diet. A systematic review of human studies found biotin monotherapy showed no consistent benefit on objective hair growth outcomes; where improvements appeared, they came in combination products that cannot credit biotin alone, and controlled studies in telogen effluvium found no biotin-level differences between hair-loss patients and controls. The review's conclusion is blunt: evidence does not support routine biotin for hair loss without documented deficiency. One warning that matters more than the hair question: high-dose biotin interferes with common lab immunoassays - it can falsely skew thyroid and troponin results, which is the kind of error that sends care in the wrong direction, so tell your clinician you take it before any blood draw. Who genuinely benefits: people with true deficiency from malabsorption, prolonged raw-egg-white diets, certain medications, or rare genetic conditions - and that is a lab test, not a guess. For everyone else, the hair-loss workup (iron, thyroid, hormones, pattern loss) finds more than the biotin bottle does.