Our Men Hair Thickening Foam contains water, biotin, and castor oil. It helps the serum penetrate into the follicles to awaken them from sleep, promoting new hair growth and making hair longer and thicker. Its usage method is very simple:1.Clean and dry hair and scalp. 2. Apply 1-2 pumps of foam evenly and massage gently on the scalp with a brush for 1-2 minutes until it dries naturally. After use, my scalp was awakened and gradually more and more black hair grew out, which is very healthy.