Step 2 Booster of a two-step process of Bosley Pro Bos Renew Scalp Micro Dermabrasion Works with Professional Strength Bos Renew Scalp Micro-Dermabrasion Base Treats hair & scalp at a cellular level Improves the health of follicles & reduces hair loss Provides a healthier environment for new hair growth Perfect for all hair types For professional salon use only To use: Mix 1.6 base with suggested ration in bowl & apply with color brush to dry hair. Leave on for 5-15 minutes & shampoo