hydrolyzed keratin

Is your hair feeling dry, brittle, or impossibly frizzy? The culprit might be keratin loss — and the fix is simpler than you think. This ultimate guide breaks down exactly what keratin does for your hair, which treatments actually work (from $15 masks to $400 salon services), and how to build a routine that keeps your strands strong, smooth, and protected. Whether you’re dealing with heat damage, color processing, or just years of wear, you’ll find real answers here.