NIOXIN Scalp + Hair Thickening System 4 — Full-Size 3-Month Kit for Color-Treated Hair with Niacinamide & Biotin

Nioxin System 4 is a three-step salon-strength kit that cleanses, conditions, and treats color-treated, damaged hair to create the appearance of thicker, fuller hair while supporting scalp health.

Designed for color-treated hair with progressed thinning, this full-size, 3-month supply uses a layered approach—shampoo, lightweight conditioner, and leave-in scalp treatment—formulated with niacinamide and biotin to strengthen hair, reduce breakage, and refresh the scalp. The system follows a skin-care-inspired philosophy, removing build-up that can clog follicles, balancing moisture, and adding vibrancy to colored hair without weighing strands down.

How does this kit reduce breakage and create thicker-looking hair?

The System 4 regimen focuses on improving hair resilience and reducing loss from breakage through targeted cleansing and fortifying actives. By removing sebum and environmental residues, strands can appear denser and healthier over time.

• Step 1: Cleansing shampoo lifts oil and debris to clear follicle-clogging build-up.
• Step 2: Lightweight conditioner restores moisture balance without heavy residue.
• Step 3: Leave-in scalp and hair treatment boosts volume and reinforces strand strength.
• Key ingredients like niacinamide and biotin support surface strength and manageability.

Will System 4 protect my color-treated hair while thickening?

Yes — this kit is formulated specifically for colored, damaged hair and includes gentle surfactants and protective botanicals to help preserve shade and shine. It balances cleansing power with nourishment so color vibrancy is maintained as the scalp environment improves.

• Color-safe cleanser that removes impurities without stripping dye.
• Conditioner balances moisture to prevent dryness and color fade.
• Antioxidants and UV-protecting ingredients help protect color from environmental stressors.

How do I use the three steps for best results?

Follow the simple, salon-style sequence: shampoo to cleanse, conditioner to hydrate, then a leave-in treatment to refresh the scalp and expand hair appearance. Consistent use delivers the intended thickening and scalp-support benefits.

• Step 1: Massage cleanser into wet hair and scalp, then rinse thoroughly.
• Step 2: Apply from scalp to ends, leave briefly if desired, then rinse.
• Step 3: Shake the treatment and apply directly to the scalp; do not rinse.
• For steady results, use as your regular shampoo/conditioner routine and pair with targeted Nioxin Intensive Care products if needed.

What results can I expect and how soon?

Users typically notice improvements in look and feel within weeks, with more visible density and reduced breakage over consistent months of use. Outcomes vary by individual, hair condition, and adherence to the regimen.

• Many users report fuller-looking hair in about 30 days.
• Noticeable reduction in hair breakage and improved manageability with continued use.
• Clinically informed formula developed by a brand with salon and trichology expertise.

Who is this for: Nioxin System 4 is intended for people with color-treated, dry or damaged hair experiencing progressed thinning who want a targeted, salon-grade routine to improve scalp condition, reduce breakage, and enhance the appearance of thickness. It suits those seeking a three-step, professional-strength program that keeps color integrity while supporting fuller-looking hair.

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