Plex 4 Bond Plex Shampoo. Plex 5, the Bond Plex Conditioner Is used before you apply your shampoo and conditioner. Leave on for a few minutes, then rinse and towel dry. The protein system is made up of three types of plant protein that target different parts of the hair fibre – phytantriol and provitamin B5 work together to keep the hair nice and hydrated and healthy, whilst a blend of conditioning agents help soften and smooth the hair.
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