NIOXIN System 4 Shampoo & Conditioner Liter Duo — Pumps Included, Color-Protecting Density Formula

Nioxin System 4 liter duo (shampoo + conditioner) is a salon-grade cleansing and density-protecting pair formulated to strengthen, thicken, and protect colored hair with progressed thinning.

Nioxin draws on three decades of thinning-hair research to deliver a targeted regimen: a deep-cleansing Cleanser that removes sebum, environmental residue and buildup, followed by a lightweight Scalp Therapy Conditioner that restores moisture balance and reinforces hair resilience. This liter duo comes with pumps for easy dispensing and is part of a stepped Nioxin System that supports scalp health while helping hair look fuller and more manageable.

How does this shampoo and conditioner help hair that’s color-treated and thinning?

The formulas are created specifically for colored, dry, and damaged hair with signs of progressed thinning. The Cleanser removes pore-clogging oils and residues that can weigh hair down, while the Conditioner uses Amp technology to lock in moisture without flattening the hair shaft. Together they help hair appear denser and reduce visible breakage over time.

• Pro-Color Shield technology helps protect color vibrancy while cleansing.
• Deep-purifying action removes sebum, fatty acids and styling residue.
• Lightweight conditioning preserves lift and volume at the roots.
• Designed to complement Nioxin’s three-part scalp treatment system.

What results can I expect and how soon might I see changes?

Clinical testing and consumer studies report improvements in thickness, density and fullness when the system is used as directed. Many users notice enhanced body and reduced breakage within weeks, with more visible density changes when the complete routine is maintained consistently. Results vary by individual hair condition and regimen adherence.

• Visible fuller-looking hair reported by a majority of consumers in trials.
• Supports reduction in hair breakage to preserve existing hair length.
• Color protection to maintain salon-treated tones during use.
• Best results when paired with Nioxin scalp treatments in the System protocol.

How should I use the liter duo for best effect?

Use the Cleanser first to thoroughly remove oils and buildup; follow with the Scalp Therapy Conditioner to hydrate and reinforce hair fibers. Massage scalp gently during cleansing to lift impurities, then distribute conditioner from mid-lengths to ends, rinsing after the recommended contact time. Regular, repeated use yields the most consistent improvements in texture and appearance.

• Dispense using the included pumps to control product amount and waste.
• Apply Cleanser to wet hair, lather and rinse; repeat if needed.
• Work Conditioner through lengths, leave briefly, then rinse thoroughly.
• Follow with Nioxin scalp and topical steps for a full regimen.

Is this duo safe for daily use and sensitive scalps?

The system was dermatologically tested and formulated to be scalp-friendly while offering clarifying action; however, individual sensitivities vary. If your scalp is reactive or you have a known allergy to ingredients listed on the label, perform a patch test or consult a dermatologist before daily use. The lightweight conditioner is designed to avoid buildup, making routine use more practical for many users.

• Dermatologically tested formulas suitable for many users.
• Light conditioning minimizes residue that can weigh hair down.
• Patch-test recommended for sensitive scalps or ingredient concerns.
• Compatible with color-treated hair when used as directed.

Who is this for: This liter shampoo and conditioner duo is intended for people with color-treated, dry or damaged hair exhibiting progressed thinning who want a regimen-grade solution to cleanse the scalp, protect color, and increase hair resilience. It’s suited for salon users, at-home maintenance routines, and anyone seeking larger-format bottles with pumps for convenience and economy. For best outcomes, use as part of the matching Nioxin System and consult haircare professionals if you have specific scalp conditions.

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