How does the science behind keratin and protein treatments actually strengthen human hair, and are there any long-term side effects of frequent use?
Answer (1)
Human hair is made mostly of keratin, a natural protein that gives it structure and strength. When hair is damaged by heat, chemicals, or coloring, the keratin bonds break down. Treatments fill in these gaps with protein, making hair smoother, shinier, and temporarily stronger.Possible long-term side effects of frequent useProtein overload that makes hair stiff, dry, and brittleScalp irritation from strong chemicals in some treatmentsHair thinning or breakage if overusedHealth risks from exposure to formaldehyde in certain salon keratin treatments
