*Biotin is wonderful for people wanting longer stronger hair. * *Another member of the B family, biotin has to be replenished daily, and all you need is 100% of the RDA to see results. However I take 333%- what I don't use is discharged by my kidneys.* *Biotin forces hair cells to grow. This doubles the hair growth monthly. People with longer hair might not see the results in the first few weeks, but you will feel it in the shower. Your hair will be heavy when wet. * *I have a friend, who has a friend with graves disease. She lost her hair as a result. When I met her she had been without hair for a year and a half. I told her about Biotin and what it does - she is a barber so she was skeptical on the "double the hair growth" part, but she gave it a shot.* *90 days later she had a full head of hair - and its still growing, she no longer wears her wigs. Now, when bald men come to her chair and complain, she recommends biotin. * I love Carlson brand. I'm one to test out different brands of vitamins until I find one I feel absorbs well. Carlson is reasonably priced, and I believe is one of the best absorbing brand. I could feel AND see the difference in my hair in two weeks.