Biotin is familiar from hair and beauty supplements. A high number on a bottle can look impressive, but choosing a supplement starts with understanding what that number means and whether you need it. Hair concerns also deserve attention beyond a supplement label.
Biotin is a nutrient, not a guaranteed hair treatment
Biotin is a B vitamin involved in using carbohydrates, fats and proteins from food. It occurs in foods including eggs, fish, nuts and seeds. Evidence supporting biotin supplements for improved hair, skin or nails is limited; the presence of a nutrient in normal body processes does not establish that extra amounts improve appearance. The NIH Office of Dietary Supplements reviews the evidence.
Understand micrograms and milligrams
The supplied Greenlife bottle image displays 10,000 μg and 30 tablets. Micrograms may be written as μg or mcg. There are 1,000 micrograms in one milligram, so 10,000 μg equals 10 mg. That is a unit conversion, not advice about an appropriate daily amount.
Compare products using the same unit and serving basis. Do not compare a per-tablet number on one label with a daily-serving number on another. Keep a record of any multivitamin or beauty blend you also use so that a pharmacist can see the complete picture.
Tell your blood-test team
Biotin supplements can interfere with some laboratory tests and cause misleading results, including certain hormone tests. Tell the clinician arranging a test and the team taking your sample about the product, amount and last time you took it. Follow their instructions rather than choosing your own pause period. See NIH guidance on biotin and laboratory tests.
A useful checklist for your appointment
- Bring the full supplement label, not only the product name.
- Describe what has changed and when you first noticed it.
- Mention other medicines, supplements and planned tests.
- Ask whether supplementation is appropriate for your situation.
The product image is useful for identifying the bottle, but it cannot answer every question about suitability. Check the current full label and ask for missing information before purchase. Persistent or sudden hair changes are a reason to seek professional advice rather than repeatedly increasing supplement strength.
General information, not individual medical advice. Product details reflect supplied catalogue material; check the current pack and ask a pharmacist about suitability.
Sources and further reading
Sources checked 3 November 2026. Product formulations can change; check the pack supplied with your order. These sources do not endorse this shop or its products.