Hair growing tip: I used to grow a few inches of hair a year. After taking biotin my hair grows over foot each year. It's been two years since I stopped taking biotin. Hair growth remains the same.

My body must be carrying leftover deposits of biotin or something for my hair to be growing at the same rate.

For nearly two years, I took 3 gummies daily of Nature's Bounty Optimal Solutions Advanced Hair, Skin, Nails, 2X Biotin.

Pros: It didn't make my head hurt or make me naseuous. It's didn't make me constipated either like many supplements can. (A pharmacist once told me that calcium supplements constipates everyone, so it was important to me that there was no calcium in it.) There were no downsides for me other than needing haircuts sooner in the year.

Good luck on if you're trying to grow your hair! :)