I have been taking 7.5 mg of biotin for a while under doctors orders to help with my diabetes control. Well while taking the 7.5 mg I was experiencing 1 to 1.5 inches of hair growth a month, which is great for me. But for the last 2 weeks I have taken 12mg of biotin again under doctors orders to help control my blood sugar and it appears to be working. Well last night I washed my hair and I had these 1 inch hairs sticking up in the middle of head that are now 2 inches. That's 1 inch of growth in two weeks. So I checked and rechecked my hair growth all over and I had indeed grown one inch in the past two weeks. I even had my husband check. I called my doctor to let him know and he said that was great, but advised me to take the 12mg for one month, then skip a week or two to keep my body from becoming accustomed to the dosage. He said I could drop it back down to 7.5mg if I wanted to or skip it entirely. I have been getting some of the side effects. The skin on one side of my face has these tiny tiny bumps on it, but I have increased my water intake and that seems to help. I am also using a facial scrub every three days. My doctor says the biotin is causing my skin to shred more (our skin is suppose to shed by the way), but it will only keep my skin younger looking longer.