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Olaplex No. 6 strengthens, hydrates, moisturises and smoothes hair. Defines and smoothes natural curls. Made without sulphates, parabens or gluten. Vegan. Colour-safe. What It Is Olaplex No. 6 is a leave-in reparative styling crème which eliminates frizz, hydrates and protects all hair types. Formulation Concentrated leave-in smoothing cream is excellent for all hair types including all coloured and chemically treated hair. OLAPLEX products are thoroughly tested in-house and by independent third-party laboratories for safety and efficacy. This product testing includes the industry standard Human Repeat Insult Patch Test (HRIPT), which tests for skin irritation or sensitivity. All of OLAPLEX products passed the HRIPT.