Biotin deficiency is a relatively uncommon condition, and the vast majority of people can get enough biotin (also known as vitamin B7) just from eating a well-rounded, balanced diet, per Healthline.

Do you need to take them? "Biotin supplementation is unnecessary unless you have a diagnosed deficiency or are advised to supplement by your physician," says Dr. Castilla. "And since the vitamin ...

It’s water soluble, so an excess amount would get excreted in the urine.” However, a biotin deficiency is possible. Both Morrow and Di Vincenzo describe some of the warning signs as ...