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

Nioxin System 1 Scalp + Hair Thickening Shampoo is a salon-grade cleansing formula made to detoxify and add body to natural, untreated hair with light thinning.

This concentrated cleanser removes buildup, minerals and environmental impurities while preserving essential oils to create a cleaner scalp environment and fuller-looking hair. Formulated with botanical extracts, humectants, niacinamide and biotin, the shampoo is intended to support scalp clarity and hair resilience when used as part of the System 1 routine.

How does this shampoo help with fine, naturally thin hair?

The formula focuses on clearing residue and blockages at the scalp to improve nutrient access to follicle sites and create visible lift and body. Daily use supports smoother hair cuticles and reduced breakage for a thicker appearance over time.

• Detoxifies scalp by removing product buildup, minerals and pollutants
• Preserves natural oils so hair isn’t over-dried
• Contains biotin and niacinamide to support hair surface strength
• Promotes fuller-looking strands when paired with the System 1 conditioner and treatment

What results can I expect and how soon?

Users typically report improved fullness and body with continued use; visible changes are commonly noticed within weeks when the full three-step system is followed. The shampoo alone cleanses and primes the scalp, while combined products aim to reduce breakage and enhance density perception.

• Designed to add volume and shine to fine hair
• Helps reduce visible thinning by increasing hair resilience
• Clinical and consumer feedback supports an improved appearance of thickness
• Best results achieved with daily use and System 1 conditioner/treatment

How should I use this product in my routine?

Apply to thoroughly wet hair, massage gently into the scalp and hair to create a lather for about one minute, then rinse. For a complete regimen, follow with Nioxin System 1 Scalp Therapy Conditioner and the Scalp & Hair Treatment to support density protection and scalp nourishment.

• Use daily on fine, untreated hair with light thinning
• Massage into scalp to clear follicles and stimulate circulation
• Rinse thoroughly and follow with System 1 conditioner
• Combine with topical treatments for targeted scalp care

Is this shampoo safe for color-treated or chemically processed hair?

Nioxin System 1 is formulated specifically for natural, non-chemically treated hair, so those with color or chemical services should choose the system tailored to their hair type. Using the system matched to your hair’s condition helps ensure optimal cleansing without unintended effects on treated strands.

• Recommended for natural, untreated hair with light thinning
• Not formulated for chemically treated or color-altered hair
• Other Nioxin systems address colored or permed hair concerns
• Consult product labeling or a stylist for the best system match

Who is this for: Nioxin System 1 Scalp + Hair Thickening Shampoo is intended for people with fine, natural or untreated hair experiencing light thinning who want a salon-tested cleanser that removes scalp buildup, supports hair resilience and helps create fuller-looking hair when used as part of the full Nioxin System 1 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