Key Features Strengthens nails Pro Keratin formula Easy brush application 5ml bottle Active Ingredients: Formaldehyde (Hardening Agent, typically low concentration), Water, Alcohol, Hydrolyzed Keratin.Mavala is a Swiss brand specializing in nail and hand care. This is an intensive treatment designed to harden the free edge of soft nails.Apply to the free edge of the nail only. Leave on for 1 minute, then massage any overflow into the cuticle and wipe hands clean. Use 2-3 times per week until nails are strong.WARNING: DANGER. Flammable. Contains formaldehyde. Avoid contact with skin and cuticles. If product leaks, wipe off immediately and rinse with water.