Biotin and a bunch of other supplements, eating a clean diet most of the time, getting a good amount of exercise, lots of water, and good sleep have all come together to bring back some of the hair I've lost due to thyroid and age. It has also helped my fingernails get healthier and start growing again, and has helped with my thinning eyelashes too.

Good luck!
--I'm located in Western PA.
--I found NC in late 2004, CG since February 2005, started going grey in late 2005.
--My hair is 3B with some 3A, texture-medium/fine, porosity-normal except for the ends which are porous, elasticity-normal.
--My long time favorite products are Suave & VO5 conditioners, LA Looks Sport Gel, oils, honey, vinegar.
--My CG and grey hair progress --