biotin is for general health not specifically for growing hair?
with so many peanuts and peanut products being eaten these days its hard to imagine anyone isn't getting a surplus of biotin.
try eating more green veg, eggs and cow/pig/lamb liver to give your intestinal bacteria something to synthesize biotin from?
if biotin did grow facial hair then all the women of Georgia would be so hairyfaced as to be perfect extras for Planet of the Apes sequels.