Keratin is a fibrous and structural protein that makes up approximately 90% of the hair fiber, essential for giving hair strength, elasticity, protection from external agents, and shine. It is essential for hair health because it repairs structural damage, prevents breakage, reduces frizz, and protects hair from oxidation, acting as a natural shield.
Structure and Composition: It is a protein rich in amino acids, especially cysteine, which forms sulfur bonds responsible for the strength of the hair fiber. It is organized into helical filaments (alpha-keratin).
Why it's important (Features):
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Resistance and Protection: Protects hair from atmospheric agents (humidity, rain) and thermal/chemical damage (straighteners, dyes).
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Structure and Strength: Repairs damaged areas, strengthening fragile and damaged hair.
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Shine and elasticity: Keeps hair elastic, shiny and silky.
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