Wella SP Balance Scalp Energy Serum strengthens thinning hair. The patented formula can reduce hair loss by up to 50%. It stimulates the blood flow and improves the anchoring of the hairs in the scalp. Use: Gently massage into the scalp. Do not rinse out. Use three times a week or daily for acute hair loss. For best results, prepare the scalp with SP Balance Scalp Shampoo before use.