Biotin is a water-soluble B vitamin that can have a beneficial effect on a number of structures and functions in the body.* In a clinical trial, 45 patients with brittle fingernails received oral supplementation of 2.5 mg biotin for 1.5-7 months. Ninety-one percent showed "definite improvement," exhibiting firmer, harder fingernails after an average of two months of supplementation.*

Biotin in a higher amount, such as is present in Thorne's Biotin-8, supports glucose metabolism by stimulating glucose-induced insulin secretion in pancreatic beta cells and by accelerating glucose metabolism in the liver.* Biotin also enhances muscle insulin sensitivity by increasing uptake of glucose by the muscle cells.*