Our Hair Growth Serum contains Glycerin, Biotin, and Ricinus Communis (Castor) Seed Oil. It nourishes and protects hair, improves the health of hair follicles, and promotes hair growth. Castor oil helps keep hair hydrated. To apply, wash your hair and scalp before use. Apply 2-3 drops of serum directly to the scalp in the area to be treated and gently massage for 1-2 minutes until fully absorbed. This serum may help support the health of hair follicles and promote the appearance of thicker, healthier-looking hair.