Being an oil-based product, it is always best to start by applying only a small amount of our natural hair serum, then gradually apply more if needed. For fine or thin hair types, we recommend applying 2 to 3 drops to damp or dry hair before styling, and 4 to 5 drops for thicker, frizzier hair. Each and every person will apply a unique amount of our hair serum depending on specific hair types and conditions. When applying as a pre-wash scalp and hair oil treatment, you can apply more generously to cover all sections of your scalp, as well as your ends. Leave in for at least 30 minutes or up to about 2 hours.