NIOXIN System 4 Scalp + Hair Shampoo for Color‑Treated, Damaged Hair — 33.8 fl oz, Niacinamide & Biotin for Thicker‑Looking Hair

Designed as the first step in Nioxin's three-part regimen, System 4 Shampoo uses Pro-Color Shield and Activ Renewal technologies to lift sebum, fatty acids, and environmental buildup from hair and scalp while adding moisture to chemically treated strands. Clinical and dermatological testing supports its use for dry, damaged, color-treated hair that shows progressed thinning. Use daily with the matching conditioner and scalp treatment to optimize results.

How does this shampoo prepare my scalp for thicker-looking hair?

The formula focuses on derma-purifying the scalp to create an environment that supports hair resilience and visible fullness. It removes pore-clogging residue that can interfere with hair structure and the action of follow-up products in the System 4 kit.

• Pro-Color Shield tech helps protect hair dyes during cleansing
• Activ Renewal targets sebum, fatty acids, and environmental grime
• Deep but gentle cleansing to avoid stripping fragile, color-treated strands

Will this product work on dry, chemically treated hair without fading color?

System 4 is formulated specifically for color-treated, chemically processed hair: it balances moisture with a cleansing action that aims to preserve color vibrancy. While individual results vary, the Pro-Color Shield component helps minimize color loss compared with standard clarifying shampoos.

• Moisturizing agents help reduce brittleness from chemical services
• Color-safe cleansing lowers the risk of accelerated fading
• Recommended for daily or regular use as part of the System 4 regimen

How quickly can I expect to notice thicker or fuller-looking hair?

Visible changes depend on usage consistency and the overall regimen, but Nioxin reports many users see a difference in hair fullness within about 30 days when using the full System 4 kit. The shampoo itself primes the scalp and hair to respond better to the conditioner and topical treatment.

• Clinical reports show a majority of users notice thicker or fuller appearance
• Best results observed when shampooing daily and following with System 4 conditioner and treatment
• Works to reduce breakage and improve hair resilience over weeks of use

How should I use System 4 Shampoo for optimal results?

Apply to thoroughly wet hair, massage gently into scalp and hair, lather for about a minute, then rinse completely; repeat if desired. Pairing this cleanser with Nioxin System 4 Scalp Therapy Conditioner and the Scalp & Hair Treatment enhances thickness and scalp health benefits.

• Use on wet hair; massage into scalp for one minute before rinsing
• Follow with System 4 conditioner and leave-in scalp treatment for best outcome
• Daily application is recommended for consistent upkeep of scalp environment

Who is this for? Nioxin System 4 Scalp + Hair Shampoo is intended for people with dry, damaged, or color-treated hair experiencing progressed thinning who want a scientifically informed, salon-grade cleanser. It suits those seeking to protect hair color while improving scalp cleanliness and creating the basis for thicker-looking hair when used as part of Nioxin’s three-step System 4 routine.

Ingredients

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