Biotin is needed in very small amounts to help the body break down fat.
The bacteria that live naturally in your bowel are able to make biotin, so it's not clear if you need any additional biotin from the diet.
Biotin is also found in a wide range of foods, but only at very low levels.
What happens if I take too much biotin?
There's not enough evidence to know what the effects might be of taking high daily doses of biotin supplements.
What does the Department of Health advise?
You should be able to get all the biotin you need by eating a varied and balanced diet. If you take biotin supplements, don't take too much as this might be harmful.
Taking 0.9mg or less a day of biotin in supplements is unlikely to cause any harm.