I never heard anything negative towards hair at any dose of HGH. HGH not anti-aging... well, build lean muscle mass, improve bone density, improve skin as well as cognitive function. Sounds like turning back the clock to me. The one negative thing a agree with is it aids in growth whether good or bad, meaning you may have a small growth or tumor and this can fuel it to grow faster or bring out cancer. This is what is not known for sure. From what I know through the years around body building as well as guys looking for anti-aging, it really helps your body and sense of well being IMO