I've been taking the PP Biotin for about 2 months now, 10mg, and I don't notice any difference in my hair growth. How long does it take for this stuff to kick in? On the up side, I have been taking Iron for about a month, 325mg, and my temples are noticably growing back. But I know that was the Iron for sure, since I was anemic and the growth coincided with my starting the iron. Anyone else here slow to respond to the Biotin?