Our Strengthening Roll on Hair Essential Oil contains rosemary oil, glycerin and coconut oil. It can clean the scalp, control oil secretion, and avoid excessive oil secretion clogging hair follicles. Help hair growth and nourish hair roots, improve hair health and repair damaged hair. The way to use it is very simple: clean your hair or beard, blow dry it, squeeze out the right amount of serum, and apply it to the affected area with a rolling ball. Massage the scalp with a massage ball for 2-3 minutes until the product is absorbed (no rinsing required). Use once in the morning and once in the evening for best results. Stimulate hair follicles, strengthen hair roots, promote hair growth and smooth hair, making hair thicker and darker.