YouthLock hair care products, formulated with collagen, help lock in shine and hydration while bringing back youthful body and bounce to brittle, dry, unmanageable hair. - Joico Youth Lock Shampoo 300ml. YouthLock Shampoo provides a prime opportunity to gently cleanse tired tresses, bringing back the joi of lush, lively, lustrous-looking hair. - Joico Youth Lock Conditioner 250ml. The solution for mature hair that’s dry, brittle, and falling short these days. Delivering that telltale body, bounce, shine, and softness, this moisturizing caretaker reinvents hair with a lustrous new outlook.