Syntonics® conditioners include the Botanical Rejuvenating Conditioner: a hydrating and restorative element of the relaxer system, the Repair Therapy Intensive Conditioner: a deep conditioning treatment that rebuilds and strengthens hair, the Botanical Strengthening Serum: a leave-in conditioner that imparts natural sheen and protects against the sun, and the Brightening Conditioner for Gray & Silver Hair: a conditioner designed to neutralize yellow discoloration of gray and silver hair. Syntonics® conditioners use natural botanical ingredients to enhance moisturizing effects and complete the hair repair process.