NIOXIN Scalp & Hair Thickening System 4 — For Color-Treated Hair, 3-Month Kit with Biotin

Nioxin System 4 is a three-step professional hair-thickening kit formulated to restore moisture balance and create fuller-looking density in dry, color-treated hair with progressed thinning.

This full-size, three-month supply combines a cleanser shampoo, a lightweight scalp therapy conditioner, and a leave-in scalp & hair treatment that work together to remove build-up, strengthen fragile strands, and refresh the scalp. The formulas include biotin and niacinamide and are designed to protect color while improving hair resilience and visible thickness. System 4 follows a skin-care-inspired approach to scalp health to create a healthier environment for hair to look fuller.

How does System 4 make color-treated, damaged hair look thicker?

Nioxin System 4 targets follicle-clogging sebum and environmental residues that blunt hair’s natural volume. By cleansing away impurities, protecting color, and reinforcing each strand, the system helps hair appear denser and more resilient to breakage.

• Step 1 cleanser removes sebum and residues that can weigh hair down.
• Step 2 conditioner restores moisture without heavy-weight buildup.
• Step 3 leave-in treatment refreshes the scalp and boosts strand body.
• Contains biotin and niacinamide known to support hair tensile strength and scalp comfort.

Will this protect my hair color while improving thickness?

Yes—System 4 is formulated for color-treated hair, balancing gentle cleansing and conditioning with ingredients that help maintain color vibrancy. The lightweight conditioner and rinse-free treatment minimize fading while delivering visible fullness.

• Color-safe surfactants that lift dirt without stripping pigments.
• Lightweight moisture control to prevent over-conditioning and dulling.
• UV-protecting antioxidants help reduce color fade from environmental exposure.

How is the three-step routine used for best results?

Follow the kit sequence: cleanse, condition, then apply the leave-in treatment to the scalp. Regular use as directed helps reduce hair loss from breakage and supports a refreshed scalp environment that promotes the appearance of thicker hair.

• Step 1: Massage cleanser into scalp and hair, then rinse thoroughly.
• Step 2: Apply conditioner from scalp to ends, leave briefly, then rinse.
• Step 3: Shake the treatment bottle, apply to the scalp, and do not rinse.
• Use consistently; visible improvement reported in as little as 30 days.

What measurable benefits can I expect from System 4?

Clinical and consumer testing of Nioxin systems show a high rate of visible improvement in thickness, density, and fullness. System 4 specifically helps reduce breakage while delivering manageability and shine for damaged, color-treated hair.

• Reported increases in perceived thickness and fullness among users.
• Strengthens hairs to reduce breakage-related shedding.
• Refreshes and nourishes the scalp with targeted botanicals and antioxidants.

Who is this for: Nioxin System 4 is built for people with color-treated, dry or damaged hair experiencing progressed thinning who want to restore visible density without compromising color. It’s suitable for those seeking a salon-grade, three-step protocol to improve scalp health, reduce breakage, and achieve fuller-looking hair over continued use.

Ingredients

NIOXIN® SHAMPOO: 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 CONDITIONER: Aqua, Cetyl Alcohol, Stearamidopropyl Dimethylamine, Stearyl Alcohol, Quaternium-18, Phenoxyethanol, Benzyl Alcohol, Cetearyl Alcohol, Hydroxypropyl Guar, Bis-Aminopropyl Dimethicone, Glyceryl Stearate, Oleyl Alcohol, Methylparaben, Propylparaben, Polysorbate 60, Mentha Piperita Oil, Mentha Arvensis Leaf Oil, Menthol, EDTA, Hydroxyethylcellulose, Citric Acid, Propylene Glycol, Camellia Sinensis Leaf Extract, Cystine Bis-PG-Propyl Silanetriol, Biotin, Lecithin, Niacinamide, Panthenol, Tocopheryl Acetate, Foeniculum Vulgare Fruit Extract, Faex Extract, Acer Saccharum Extract, Citrus Limon Peel Extract, Saccharum Officinarum Extract, Vaccinium Myrtillus Leaf Extract, Citrus Aurantium Dulcis Fruit Extract, CI 42090, Potassium Sorbate, Sodium Benzoate TREATMENT: Aqua, Phenylbenzimidazole Sulfonic Acid, Niacinamide, Benzophenone-4, Caffeine, Polysorbate 20, Sodium Hydroxide, Benzyl Alcohol, Sodium Benzoate, Phenoxyethanol, PEG-12 Dimethicone, Citric Acid, Cocamidopropyl Betaine, Acetamide MEA, Isopropyl C12-15-Pareth-9 Carboxylate, Tetrasodium EDTA, Propylene Glycol, Methyl Nicotinate, Sodium Chloride, Parfum, Polysorbate 60, Polysorbate 80, Mentha Piperita Oil, Mentha Arvensis Leaf Oil, Menthol, PEG-23M, Camellia Sinensis Leaf Extract, Limonene, Cystine Bis-PG-Propyl Silanetriol, Biotin, Lecithin, Tocopheryl Acetate, Foeniculum Vulgare Fruit Extract, Silica, Faex Extract, Acer Saccharum Extract, Citrus Limon Peel Extract, Saccharum Officinarum Extract, Vaccinium Myrtillus Leaf Extract, Citrus Aurantium Dulcis Fruit Extract, Potassium Sorbate