NIOXIN System 4 Shampoo & Conditioner 2-Liter Duo with Pumps — Color-Safe, Density-Boosting

NIOXIN System 4 liter shampoo and conditioner duo with pumps is a professional-strength cleansing and moisturizing regimen formulated to fortify color-treated, dry or damaged hair with progressed thinning for fuller-looking strands.

NIOXIN brings three decades of scalp science to this two-step pairing: a clarifying cleanser and a lightweight, density-protecting conditioner packaged in convenient one-liter bottles with pumps. The duo targets scalp buildup and fragile strands so hair appears thicker and more resilient while helping preserve color. These sets are arranged by systems (1–4) to match different stages of thinning and hair types; System 4 is specifically designed for colored, dry, and damaged hair with progressed thinning.

How does the NIOXIN duo improve hair thickness and manage thinning?

The system works by removing scalp impurities that can inhibit follicle performance and by reinforcing the hair fiber to reduce breakage. Over time, this creates the impression of increased density and fuller hair movement without weighing strands down.

• Clarifying shampoo removes excess sebum and residue from styling products.
• Conditioner delivers lightweight moisture and strengthens weakened hair shafts.
• Formulation helps reduce breakage, which preserves existing length and density.
• Visible improvements reported within about 30 days for many users.

Will this set protect color-treated hair while treating thinning?

Yes — System 4 is formulated to be safe for colored hair and includes technologies that help preserve color vibrancy while addressing progressive thinning. The ingredients are balanced to cleanse without stripping dye and to support hair resilience.

• Pro-Color Shield technology minimizes color fade during cleansing.
• Conditioner helps seal the cuticle for smoother, shinier color reflection.
• UV-protecting antioxidants assist in reducing environmental color damage.
• Gentle, dermatologically tested formulas suited to color-treated scalps.

How should I use the liter shampoo and conditioner for best results?

For an effective routine, apply the cleanser to wet hair and massage into the scalp to lift oils and residue, then rinse thoroughly. Follow with the conditioner applied from mid-lengths to ends and leave in briefly before rinsing to build moisture and strength.

• Use the pump to dispense a controlled amount — start with a quarter-sized portion and adjust by hair length.
• Massage shampoo into the scalp for 60–90 seconds to maximize cleansing action.
• Apply conditioner mainly to lengths and ends; avoid excess at the roots if prone to oiliness.
• For a full regimen, pair with NIOXIN's scalp treatments from the same system.

How quickly will I notice changes and what results can I expect?

Individual results vary, but many users report improved hair fullness and reduced breakage within several weeks. The product is intended to improve the appearance of density by strengthening strands and maintaining a healthier scalp environment.

• Some users see visible thickening in about 30 days with consistent use.
• Reduced breakage leads to retained length and a fuller look over time.
• Enhanced manageability and smoother texture for colored, dry hair.
• Clinical use and consumer feedback support increased density and fullness metrics.

Who is this for: These liter duo sets are designed for anyone with dry, damaged, or color-treated hair experiencing progressed thinning who wants a salon-grade, pump-dispensed daily regimen. Choose the system number that matches your scalp condition and hair type — System 4 is specially formulated for color-treated hair with noticeable thinning and damage. The large one-liter format is ideal for households, frequent users, or professionals seeking value and consistent, science-based performance.

Ingredients

Shampoo: WATER/EAU, 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 (PEPPERMINT) 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 (FENNEL) FRUIT EXTRACT, SODIUM ACETATE, ISOPROPYL ALCOHOL, YELLOW 5, YEAST EXTRACT/ EXTRAIT DE LEVURE, ACER SACCHARUM (SUGAR MAPLE) EXTRACT, CITRUS LIMON (LEMON) PEEL EXTRACT, SACCHARUM OFFICINARUM EXTRACT, VACCINIUM MYRTILLUS LEAF EXTRACT, BLUE 1, CITRUS AURANTIUM DULCIS (ORANGE) FRUIT EXTRACT, RED 33, POTASSIUM SORBATE. Conditioner: Aqua/Water/Eau, Cetyl Alcohol, Stearamidopropyl Dimethylamine, Stearyl Alcohol, Quaternium-18, Phenoxyethanol, Benzyl Alcohol, Cetearyl Alcohol, Hydroxypropyl Guar, Glyceryl Stearate, Oleyl Alcohol, Propylparaben, Polysorbate 60, Mentha Piperita (Peppermint) Oil, Mentha Arvensis Leaf Oil, Menthol, Propylene Glycol, Methylparaben, EDTA, Hydroxyethylcellulose, Citric Acid, Camellia Sinensis Leaf Extract, Quaternium-80, Cystine Bis-PG-Propyl Silanetriol, Biotin, Lecithin, Niacinamide, Panthenol, Tocopheryl Acetate, Foeniculum Vulgare (Fennel) Fruit Extract, Acer Saccharum (Sugar Maple) Extract, Citrus Limon (Lemon) Peel Extract, Saccharum Officinarum/Sugar Cane Extract/Extrait de canne à sucre, Vaccinium Myrtillus Leaf Extract, Faex Extract/Yeast Extract/Extrait de levure, Citrus Aurantium Dulcis (Orange) Fruit Extract, Maltodextrin, Blue 1 (CI 42090), Potassium Sorbate, Sodium Benzoate, Ethylparaben, Butylparaben