The Nioxin System 4 Shampoo & Conditioner Duo pairs a 1 L Scalp + Hair Shampoo with a 1 L Scalp + Hair Conditioner, the first two steps of Nioxin's System 4 hair-thickening regimen for coloured or chemically treated hair with progressed thinning. Both formulas are clinically and dermatologically tested.

The shampoo is a derma-purifying cleanser. It removes dirt, excess oil and environmental residue from the scalp and hair, helping prevent the follicle-clogging sebum that can weigh thinning hair down, while preparing the scalp for the rest of the system.

The lightweight conditioner follows by hydrating scalp and hair from root to tip. It helps maintain moisture balance and resilience, strengthens hair against damage and breakage, and leaves hair looking fuller without weighing it down.

• Amplifies hair texture and strengthens resilience for thicker, fuller-looking hair
• Helps minimize breakage while protecting colour
• Wild mint and peppermint oils for a refreshing scalp feel
• Gluten free, cruelty free and colour safe

For the full System 4 regimen, follow with the System 4 Scalp + Hair Thickening Leave-In Treatment (sold separately) and use all three steps at least three times a week. Nioxin reports visible results in 30 days with the complete system.

Not sure which system fits? Systems 1 and 2 are for natural, untreated hair, and System 3 is for coloured hair with light thinning. System 4 replaces the former System 6.

Shampoo: Aqua/Water/Eau, Sodium Laureth Sulfate, Sodium Lauryl Sulfate, Sodium Chloride, PPG-2 Hydroxyethyl Coco/Isostearamide, Sodium Benzoate, Citric Acid, Salicylic Acid, Mentha Arvensis Leaf Oil, Mentha Piperita (Peppermint) Oil, Tetrasodium EDTA, Trisodium Ethylenediamine Disuccinate, Methylparaben, Polyquaternium-10, Propylene Glycol, Sodium Hydroxide, Limonene, Camellia Sinensis Leaf Extract, Cystine Bis-PG-Propyl Silanetriol, Niacinamide, Panthenol, Biotin, Lecithin, Tocopheryl Acetate, Foeniculum Vulgare (Fennel) Fruit Extract, Yellow 5 (CI 19140), 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, Propylparaben, Blue 1 (CI 42090), Phenoxyethanol, Citrus Aurantium Dulcis (Orange) Fruit Extract, Red 33 (CI 17200), Maltodextrin, Potassium Sorbate, Sodium Citrate, Ethylparaben, Butylparaben, Sodium Xylenesulfonate. Conditioner: Aqua/Water/Eau, Cetyl Alcohol, Stearamidopropyl Dimethylamine, Stearyl Alcohol, Distearyldimonium Chloride, Phenoxyethanol, Benzyl Alcohol, Cetearyl Alcohol, Hydroxypropyl Guar, Glyceryl Stearate, Oleyl Alcohol, Mentha Piperita (Peppermint) Oil, Mentha Arvensis Leaf Oil, Propylparaben, Polysorbate 60, Propylene Glycol, Methylparaben, EDTA, Hydroxyethylcellulose, Citric Acid, Quaternium-80, Limonene, Camellia Sinensis Leaf Extract, Cystine Bis-PG-Propyl Silanetriol, Tocopheryl Acetate, Lecithin, Biotin, Panthenol, Niacinamide, Foeniculum Vulgare (Fennel) Fruit Extract, Disodium Phosphate, Acer Saccharum (Sugar Maple) Extract, Vaccinium Myrtillus Leaf Extract, Citrus Limon (Lemon) Peel Extract, Saccharum Officinarum/Sugar Cane Extract/Extrait de canne à sucre, Faex Extract/Yeast Extract/Extrait de levure, Sodium Phosphate, Citrus Aurantium Dulcis (Orange) Fruit Extract, Maltodextrin, Blue 1 (CI 42090), Potassium Sorbate, Sodium Benzoate, Ethylparaben, Butylparaben.