Whats the pros and cons of biotin?

Vitamin H/B7: Biotin vitamin b7 or vitamin h is an essential vitamin daily requirement is 30microgram of biotin, which is readily available in well balanced diet containing egg yolk, cheddar cheese, pork, liver, salmon, whole wheat bread.And normal bacteria in the small bowell also synthesise biotin deficiency of biotin can cause hair loss and brittle nails and may require supplements 2to10mgm daily.