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Unisex appeal: Perfect for both men and women
bouncy curls—especially beneficial when you want curl definition to pop after washing
and refining hard-to-reach areas without disturbing the rest of your makeup
helping skin look more luminous over time
layer in thin passes rather than a single heavy swipe
nioxin diameter system 4 scalp hair treatment colored hair progressed thinning color safe 200ml best-seller Unisex appeal: Perfect for bothNioxin Diameter System 4 Scalp & Hair Treatment is engineered for colored hair with progressed thinning, delivering targeted scalp care while helping hair appear thicker and fuller. As Step 3 in the 3D Care System Kit 4, this leave in treatment is formulated to protect treated hair while you address thinning concerns, giving you a breathable, manageable routine without sacrificing color integrity. Why this matters for color treated haira specialized
