Nioxin Diameter System 4 Scalp & Hair Treatment is a color-safe, leave-on solution designed for colored hair with progressed thinning. As Step 3 in the 3D Care System Kit 4, this treatment targets thinning areas while preserving color-treated strands, helping you achieve a thicker, more confident look without rinsing.

Powered by Scalp Access Delivery 2.0 with UV-protection ingredients, it nourishes the scalp, supports hair resilience, and helps balance moisture to keep hair comfortable and reduce dryness. This targeted formula works in harmony with System 4 to maximize fullness and color longevity, so your dyed hair stays vibrant as thinning concerns improve.

Application is simple: shake well, apply evenly to the entire scalp, and do not rinse. The convenient, no-rinse design makes it easy to integrate into your daily routine and ongoing color maintenance, delivering ongoing support between shampoos.

• Step 3 of 3D Care System Kit 4
• Specially designed for colored hair with progressed thinning
• Scalp Access Delivery 2.0 with UV-protection ingredients
• Color-safe formula respects treated hair
• Supports moisture balance and hair resilience
• Unveils thicker, fuller-looking hair

Add Nioxin Diameter System 4 to your routine today and enjoy thicker, fuller-looking hair.