Although biotin is known to strengthen hair and nails and improve skin conditions, taking 5,000 micrograms of it every day is not necessary to achieve these benefits, Everyday Health states. The recommended daily dosage of biotin for an adult is 30 micrograms.
Biotin is a form of vitamin B that is important for hair, skin and fingernail health as well as the proper functioning of the eyes, liver and nervous system, notes Everyday Health. This supplement is especially important for pregnant women to take in order to promote normal fetal development.
Although some people take 5,000 micrograms of biotin every day with no problems, others who take the same amount daily report symptoms such as weight gain and hot flashes that they attribute to their large dosage of biotin. However, biotin is a safe and nontoxic vitamin that has not been associated with any serious side effects, even when taken in doses that greatly exceed the recommended daily amount, notes Everyday Health.
Biotin is not known to interact with any herbal supplements, but it is not clear whether it interferes with any prescribed medications, cautions Everyday Health. There are medications that lower biotin levels in the body after taking them for a long period of time, including antibiotics and anti-seizure medications such as carbamazepine, phenobarbital, phenytoin and primidone. Smoking and consuming raw egg whites can cause biotin deficiency as well.