Glemme Laser Hair Growth Comb Brush with Biotin Hair Growth Serum for Hair Loss, Hair Regrowth Treatment Products for Men and WomenThe first laser hair growth comb that can be used with serum. Add our biotin serum to the tank to promote the absorption of the serum while using laser treatment. After many experiments, the hair comb and serum used together provided a 39 percent increase in hair growth over a period of 20 weeks. How it works Our Laser hair growth device is clinically proven to regrow thinning hair and prevent further progression of hair loss due to androgenetic