The manufacturer suggests applying two to three drops on the oil to moist or dry hair, daily or as necessary, and leaving it on. In combination with applying it to your scalp to advertise hair growth, You should utilize it over the lengths of your hair to strengthen your strands, https://allhealthmarket.com/product/health-and-beauty-2/hair-care/10-15-20pcs-biotin-fast-oil-hair-serum-baldness-hair-thinning-regrowth-treatment-liquid-anti-hair-loss-for-women/