When supplementing with biotin, it usually takes a few weeks to months before you see results. As with any supplement, the exact timeframe depends on individual factors such as your starting level, the dosage and how consistently you take it:
Skin, hair and nails: Improvements in hair texture or faster growth are usually noticeable after around 2–3 months of daily use. Nails can often become stronger and less brittle within 4–6 weeks, as they renew faster than hair.
Energy metabolism and vitality: A slight increase in energy levels and mental alertness may be noticeable after just 2–4 weeks, especially in people who previously had a significant deficiency.
For visible changes, particularly to skin and hair, long-term regular use over several months is ideal, as biotin works through the natural growth and renewal process of the cells.