Truth about Biotin

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   While I was researching products ingredients I cam across this:
BIOTIN (Vitamin H) 
MYTH: An exotic ingredient promoted as being necessary and beneficial for skin and hair care. 
FACT: A deficiency of this vitamin has been associated with greasy scalps and baldness in rats and other experimental animals. Fur-bearing animals, however, have a very different hair growth from human beings. Biotin deficiency in man is extremely rare. Biotin is considered a worthless additive in cosmetic products (Chase). The molecular size of Biotin is too large to penetrate the skin. 