The only patented system to noticeably repair extreme damage—turn dry, brittle hair into soft, shiny, and more resilient hair.
No. 4 Shampoo repairs and protects hair from everyday stresses — including damaged hair, split ends, and frizz — by re-linking broken bonds.
A single molecule, free of silicones and oils, dramatically improves the hair strength, protects from within, and provides immediate results.
From curly hair to stick straight, Olaplex is suitable & beneficial for all hair types.
How much No. 4 should you use per wash?
We recommend starting with a pea sized amount, adding more as needed for the length and thickness of your hair.
Is Olaplex No. 4 Sulfate Free?
As with the rest of our line, Olaplex No. 4 and No. 5 are completely non-toxic as well as sulfate-free, paraben-free, vegan, gluten-free, nut-free, and color-safe.
How often can you use Olaplex No. 4?
Olaplex No. 4 is formulated for daily or every wash use.