What biotin is
Biotin is a B vitamin involved in the metabolism of fats, glucose and amino acids. It occurs in foods and is also sold in supplements, including some products marketed for hair, skin and nails.
Why tests matter
Supplemental biotin can interfere with certain laboratory tests and produce misleading results. The effect depends on the test and the amount and timing of biotin taken. A result may be falsely high or falsely low.
Tell the people doing the test
Before a blood test, tell your clinician and laboratory about every supplement you use. Bring the packaging or a photograph that shows the ingredient amount and directions. Check combination products as well as any supplement labelled “biotin.”
Do not choose your own stop period from an online article. The appropriate advice depends on the test and your circumstances, so ask the professional arranging it.
Keep claims in perspective
A deficiency and a desire for healthier-looking hair are different situations. Evidence supporting supplements for people without a deficiency is limited. Seek advice about persistent hair, skin or nail changes instead of assuming one nutrient is the explanation.
Our label guide can help you locate the amount and units on your bottle.
General education. For advice about your health or medicines, speak with a qualified healthcare professional.
