The brand suggests applying two to 3 drops with the oil to damp or dry hair, daily or as needed, and leaving it on. Besides applying it to your scalp to market hair growth, You should use it around the lengths of your hair to strengthen your strands, minimizing breakage. https://allhealthmarket.com/product/health-and-beauty-2/hair-care/2024-biotin-fast-hair-growth-oil-hair-regrowth-serum-hair-thinning-treatment-hyperplasia-hair-loss-treatment-herbal-essence-promoting-regeneration/