NIOXIN System 4 Scalp + Hair Shampoo for Color-Treated, Damaged Hair — 16.9 fl oz, Niacinamide & Biotin for Thicker-Looking Hair

NIOXIN System 4 Scalp + Hair Shampoo is a professional-strength cleanser formulated to gently remove buildup and help improve the look of thickness for dry, color-treated hair with progressed thinning.

This sulfate-free style shampoo is the first step in NIOXIN’s three-part scalp and hair regimen. It targets residues that can weigh hair down—like sebum, environmental grime and styling buildup—while helping preserve color and moisture balance. The formula includes niacinamide and biotin to support hair body and scalp comfort without stripping treated hair.

How does this shampoo prepare hair for thicker-looking results?

The cleanser clears pore‑clogging oils and debris so subsequent treatments can penetrate more effectively. By lifting residue from the scalp and hair shaft, it helps create a cleaner foundation for conditioners and leave‑in formulas to strengthen and add density.

• Removes sebum and environmental buildup that flattens strands
• Improves absorption of follow-up scalp and hair treatments
• Prepares color-treated hair without excessive dryness

Will it protect hair color while cleansing?

The System 4 formula is made to be gentle on dyed hair while removing impurities that can fade vibrancy. Its Pro-Color Shield technology and conditioning agents help minimize color loss caused by everyday residue and washing.

• Formulated for color-treated hair preservation
• Balances cleansing with moisture to reduce color leaching
• Compatible with a color-care routine and salon follow-ups

How should I use this shampoo for best results?

Use daily on wet hair, massaging the shampoo into the scalp and through the strands to activate the lather. Rinse thoroughly and follow with NIOXIN System 4 Scalp Therapy Conditioner and the Scalp and Hair Treatment for the full program.

• Apply to wet hair, massage into scalp for about one minute
• Rinse completely and repeat only if needed
• Follow with System 4 conditioner and leave-in treatment for optimal thickening effects

What improvements can I realistically expect, and when?

Visible improvements in hair fullness and texture commonly appear with consistent use over weeks rather than days. Clinical consumer feedback shows many users notice increased fullness and density when the complete three-step regimen is used as directed.

• Helps hair look fuller and feel stronger with continued use
• Targets the scalp environment that influences strand appearance
• Best results seen when used together with System 4 conditioner and treatment

Who is this for: NIOXIN System 4 Shampoo is designed for people with dry, chemically or color‑treated hair experiencing progressed thinning who want a salon-grade cleanser that readies the scalp for targeted thickening treatments. It suits those seeking to protect color while improving the appearance of density and manageability without harsh stripping agents.

Ingredients

Aqua, Sodium Laureth Sulfate, Sodium Lauryl Sulfate, Citric Acid, Sodium Chloride, PPG-2 Hydroxyethyl Coco/Isostearamide, Sodium Citrate, Sodium Xylenesulfonate, Sodium Benzoate, Salicylic Acid, Sodium Hydroxide, Tetrasodium EDTA, Mentha Piperita Oil, Mentha Arvensis Leaf Oil, Menthol, Trisodium Ethylenediamine Disuccinate, Methylparaben, Polyquaternium-10, Propylene Glycol, Camellia Sinensis Leaf Extract, Cystine Bis-PG-Propyl Silanetriol, Biotin, Lecithin, Niacinamide, Panthenol, Tocopheryl Acetate, Foeniculum Vulgare Fruit Extract, Sodium Acetate, Isopropyl Alcohol, CI 19140, Faex Extract, Acer Saccharum Extract, Citrus Limon Peel Extract, Saccharum Officinarum Extract, Vaccinium Myrtillus Leaf Extract, CI 42090, Citrus Aurantium Dulcis Fruit Extract, CI 17200, Potassium Sorbate