I. Montaño, F. Wandrey.
Hair weathering is the deterioration of the hair shaft from root to tip and is the result of a series of cosmetic and environmentalHair weathering is the deterioration of the hair shaft from root to tip and is the result of a series of cosmetic and environmentalfactors. Cosmetic practices such as brushing, combing, dyeing, straightening, perming, etc., as well as environmentalfactors such as exposure to UV light and polluted air can induce structural damage to the F-layer and the hair fiber. The cuticlebecomes raised and porous, which exposes the cortex to further damage. A decrease in hair shine, color, elasticity and strengthis observed, which eventually leads to hair damage. In different studies measured utilizing state-of-the-art technologies, a haircare ingredient that combines tara tannins derived from Caesalpinia spinosa pods and organic sunflower sprout extract (tradename KeraGuard), revealed a capacity to protect hair against free radicals and physical stresses. It was also shown to protectdyed hair from color fading and heat damage as well as to repair chemically treated hair.