There is some preliminary evidence that biotin supplements may help to strengthen brittle nails, but there is no medical evidence for the use of biotin supplements for treating hair loss or other hair-related conditions, advises WebMD. Most people do not need biotin supplements since biotin is readily available in food, including salmon, chicken, nuts, dairy products, eggs and whole wheat breads and cereals. Most adults age 19 and older need just 30 micrograms daily, while breastfeeding mothers need 35 micrograms per day.
Biotin supports the health of the skin, metabolism, digestive tract, cells and nerves, according to WebMD. It may be useful in treating some conditions that result from diabetes or kidney failure, including peripheral neuropathy. Although more research needs to be done, biotin has also shown some positive results in the treatment of Type 2 diabetes. On its own, it may decrease nerve symptoms and insulin resistance, or when combined with chromium, it may help to improve blood sugar.
The maximum safe dose of biotin is unknown, but it appears to be safe and tolerated well even at high levels, according to WebMD. Women who are pregnant or nursing or anyone who has a medical condition should discuss biotin supplementation with their doctors prior to adding supplements to their daily routines.