NIOXIN System 4 Scalp + Hair Shampoo for Color‑Treated, Damaged Hair — 33.8 fl oz, Thickening & Color‑Protecting

Designed as the first step in Nioxin’s three-part thinning hair regimen, System 4 targets dry, chemically treated hair with progressed thinning. Its Activ Renewal and Pro-Color Shield technologies lift sebum, fatty acids and environmental buildup from the scalp and hair without stripping color. Clinically and dermatologically tested, this shampoo prepares the scalp and fiber for subsequent thickening treatments and is sized for salon-style at-home use at 33.8 fl oz.

How does this shampoo cleanse without fading my color?

System 4 combines gentle surfactants with Pro-Color Shield to remove impurities while protecting dyed hair. The formula clears residue that can dull color, yet preserves pigments so treatments last longer between salon visits.

• Pro-Color Shield supports color retention during cleansing
• Removes sebum and environmental residues that dull hair
• Balanced cleansing action suited for chemically treated strands

What visible changes can I expect and how soon?

Users reported improvements in thickness, density and fullness with consistent daily use; many notice changes within about 30 days. System 4 focuses on scalp clarity and fiber integrity, which helps hair look fuller and reduces the appearance of thinning over time.

• Clinically observed increase in hair fullness and density
• Reduces visible thinning by strengthening hair resilience
• Visible results with routine use as directed (daily application recommended)

How should I use System 4 for best results?

Apply to wet hair, massage into the scalp for about one minute to allow the active system to lift impurities, then rinse thoroughly. For a complete program, follow with Nioxin System 4 Scalp Therapy Conditioner and the Scalp and Hair Treatment to amplify thickening effects.

• Use on wet hair; lather and massage scalp for one minute
• Rinse thoroughly and pair with System 4 conditioner and treatment
• Daily use yields the most consistent improvements

Which scalp and hair concerns does System 4 address?

This shampoo is formulated for dry, damaged, color-treated hair with progressed thinning. It helps clear follicle-clogging substances, moisturizes chemically treated hair, and primes hair fibers for products that add structure and volume.

• Targets dry, chemically treated hair with visible thinning
• Removes sebum, fatty acids and environmental buildup
• Moisturizes to reduce breakage and support hair strength

Who is this for? Nioxin System 4 is aimed at people with color-treated, dry or damaged hair who are experiencing progressed thinning and want a salon-grade shampoo to cleanse, hydrate and prepare the scalp for thickening treatments. It’s suitable for daily at-home use and for those who prefer a targeted, multi-step regimen to improve the look of hair density without compromising color. For optimal outcomes, use the full System 4 kit—cleanser, conditioner, and scalp treatment—consistent with product directions.

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