NIOXIN Scalp + Hair Thickening System 1 Shampoo 33.8 fl oz — For Natural Light Thinning with Niacinamide & Biotin

Nioxin System 1 Scalp + Hair Thickening Cleanser Shampoo is a salon-grade formula designed to gently remove buildup and support fuller-looking natural, untreated hair experiencing light thinning.

This concentrated cleanser combines botanicals, humectants, niacinamide and biotin to clear pores and product residues from the scalp while preserving moisture. The formula targets the scalp environment—removing minerals, pollutants and excess oils—so hair fibers sit cleaner and appear thicker, with added body and shine. Use daily as part of the System 1 trio (cleanser, conditioner and treatment) for best results.

How does this shampoo improve the look of fine, thinning hair?

The cleanser removes the layer of product, sebum and environmental debris that can make individual strands lie flat and look sparse. By clearing those barriers at the follicle site and adding moisture-retaining humectants, hair gains lift at the roots and a fuller visual profile. The result is hair that appears denser without heavy styling products.

• Detoxifies scalp to reduce residue that weighs hair down
• Humectants maintain softness and manageability
• Niacinamide and biotin support visible hair thickness aesthetics
• Non-stripping formula keeps natural oils intact

What ingredients make System 1 suitable for natural or untreated hair?

System 1 is formulated specifically for hair that hasn’t been chemically treated, focusing on gentle cleansers and nutrient-rich botanicals. The blend removes pollutants and minerals without harsh surfactants that can over-dry delicate fine hair. Key actives help maintain scalp comfort while improving the appearance of density.

• Bionutrient Actives and botanicals to clear debris
• Niacinamide to support scalp condition and texture
• Biotin to complement routine for fuller-looking strands
• pH-balanced surfactants that avoid excessive oil removal

How should I use this cleanser for best results?

Apply System 1 to thoroughly wet hair, gently massage into the scalp and hair for about one minute to lift buildup, then rinse completely. Daily use is recommended to maintain a clear scalp environment; follow with the System 1 Scalp Therapy Conditioner and Scalp & Hair Treatment to complete the protocol. Consistent use delivers the most noticeable visual improvements within weeks.

• Use on wet hair, massage into scalp for 60 seconds
• Rinse and follow with System 1 conditioner and treatment
• For daily maintenance to keep follicles free of residue
• Suitable for morning or evening wash routines

Will this shampoo weigh my hair down or change its texture?

No — System 1 is engineered to add body and lift rather than weight. Its detoxifying action removes substances that flatten hair, while humectants preserve natural softness and manageability. The formula aims to improve visual density without leaving a heavy residue.

• Lightweight formulation avoids buildup
• Leaves hair manageable and soft to the touch
• Promotes smoother surface for improved light reflection and shine
• Compatible with styling products when needed

Who is this for: Nioxin System 1 Scalp + Hair Thickening Cleanser is best suited for people with natural, untreated hair who notice light thinning and want a non-invasive way to improve the appearance of density and body. It’s ideal for users seeking a daily salon-grade shampoo that clears scalp impurities, preserves essential oils, and pairs with complementary conditioner and treatment steps in a targeted thinning-hair regimen.

Ingredients

Aqua, Sodium Laureth Sulfate, Sodium Lauryl Sulfate, Cocamidopropyl Betaine, Sodium Citrate, Sodium Xylenesulfonate, Sodium Chloride, Cocamide MEA, Sodium Benzoate, Citric Acid, Salicylic Acid, Mentha Piperita Oil, Mentha Arvensis Leaf Oil, Menthol, Tetrasodium EDTA, Sodium Hydroxide, Methylparaben, Propylene Glycol, Camellia Sinensis Leaf Extract, Cystine Bis-PG-Propyl Silanetriol, Biotin, Lecithin, Niacinamide, Panthenol, Tocopheryl Acetate, Citrus Paradisi Peel Extract, Humulus Lupulus Flower Extract, Urtica Dioica Leaf Extract, CI 42090, Faex Extract, Acer Saccharum Extract, Citrus Limon Peel Extract, Saccharum Officinarum Extract, Vaccinium Myrtillus Leaf Extract, Citrus Aurantium Dulcis Fruit Extract, Potassium Sorbate