A22 BIOTIN BOOST HAIR + SCALP SERUM Biotin + Niacinamide + Rosemary Oil 1.7 50 24625 Reviews Increase the appearance of thicker, fuller, healthier hair with this innovative blend of 100+ vitamins, minerals, amino acids & essential oils that has been shown to support your natural healthy hair cycle and to combat signs of thinning & shedding. Made of natural ingredients.