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

Nioxin Scalp + Hair Thickening System 1 Shampoo is a detoxifying cleanser formulated to gently remove buildup and support the appearance of thicker, fuller natural hair with light thinning.

Nioxin System 1 is created for natural or untreated hair showing mild thinning. The formula uses targeted botanicals, niacinamide and biotin alongside humectants to clear residue from the scalp, maintain essential oils, and create a cleaner environment at the follicle level. Designed for daily use, this 33.8 fl oz professional-size cleanser focuses on scalp clarity, hair resilience and visible body without harsh stripping.

How does this shampoo improve the scalp environment?

This shampoo clears excess oils, styling residues and environmental pollutants that can congest the scalp, helping nutrients reach follicle sites more effectively. It’s formulated to cleanse while preserving the scalp’s natural moisture balance.

• Detoxifies buildup from styling products and minerals
• Removes pollutants and debris that can settle on the scalp
• Maintains essential oils so hair doesn’t become overly dry
• Contains botanical extracts and humectants to support scalp moisture

Will it add visible thickness and body to my hair?

System 1 is clinically designed to enhance the look of density and add noticeable body to fine, natural hair within weeks of regular use. It works by strengthening hair fibers and reducing the appearance of thinness through improved scalp health and resilience.

• Targets fine, non-chemically treated hair with light thinning
• Clinically shown to improve perceived thickness and fullness in consumer studies
• Supports hair strength to minimize breakage during styling
• Best results seen when used with the matching System 1 conditioner and treatment

How should I use Nioxin System 1 for best results?

Apply to wet hair, gently massage into the scalp and lengths for about one minute, then rinse thoroughly. For a complete regimen, follow with System 1 Scalp Therapy Conditioner and the Scalp & Hair Treatment to maximize scalp nourishment and visible thickness.

• Use daily or as recommended by your stylist
• Massage into the scalp to lift residue and stimulate circulation
• Rinse completely and follow with System 1 conditioner
• Consistent use improves results over time

What key ingredients are included and what do they do?

The formula blends niacinamide and biotin with botanical actives and humectants to cleanse gently while supporting hair strength and moisture balance. These components aim to improve scalp clarity and help hair appear fuller without aggressive surfactants.

• Niacinamide: supports scalp conditioning and barrier balance
• Biotin: contributes to the appearance of stronger hair fibers
• Botanical extracts: calm and nourish the scalp surface
• Humectants: retain scalp and hair moisture for healthy-looking shine

Who is this for: Nioxin System 1 Shampoo is intended for people with natural, non-chemically treated hair experiencing light thinning who want a salon-grade daily cleanser that focuses on scalp health and visible body. It’s a good fit for those seeking a non-stripping, clinically backed approach to reduce the look of thinning, and for anyone pairing shampoo with targeted scalp and hair treatments for a full routine.

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