Vitamin guide
Biotin
Biotin is a B vitamin involved in normal metabolism. It is heavily marketed for hair and nails, but it tends to be most relevant when intake or status is low. It should not be treated as the answer to every hair-fall concern.
Context-dependentNormal macronutrient metabolismHair and nail routines when deficiency is presentSkin health as part of overall nutrition
Supports
- Normal macronutrient metabolism
- Hair and nail routines when deficiency is present
- Skin health as part of overall nutrition
Best for
- People with low intake risk
- Hair and nail formulas where biotin is not over-positioned
- Users who understand hair growth timelines
Cautions
- Biotin can interfere with certain lab tests, including some thyroid and cardiac-marker tests.
- High-dose biotin is often unnecessary for people without deficiency.
- Tell a clinician or lab before testing.
Food Sources
Egg yolk
Salmon
Liver
Sunflower seeds
Sweet potato
Almonds
Supplement Forms
D-biotin
Biotin in B-complex formulas
Hair, skin, and nail blends
Timing
Can usually be taken with or without food; consistency matters more than timing.
Interactions To Check
Laboratory immunoassays
Some anticonvulsant medicines may affect biotin status
FAQs
Does biotin stop hair fall?
Biotin may help when deficiency is part of the problem, but hair fall can also involve iron, vitamin D, thyroid status, stress, postpartum changes, genetics, and scalp conditions.
Should I stop biotin before blood tests?
Ask the ordering clinician or lab. Biotin can interfere with some test methods, so disclosure is important.