NIOXIN Scalp + Hair Thickening Shampoo System 1 — 16.9 fl oz for Natural Light Thinning, Niacinamide & Biotin

Nioxin System 1 Scalp + Hair Thickening Cleanser is a salon-grade shampoo formulated to gently remove buildup and support fuller-looking, stronger natural hair with light thinning.

This concentrated cleanser is built for natural, untreated hair that shows early signs of thinning. It blends targeted actives like niacinamide and biotin with botanical humectants to lift impurities, clear blocked follicle pathways, and leave hair with improved body and shine — without stripping essential oils. Use as the first step in the System 1 routine alongside the matching conditioner and scalp treatment for a complete at-home regimen that supports scalp health and hair resilience.

How does this shampoo make hair appear thicker?

The formula focuses on clearing residue and environmental deposits that can flatten strands and hide natural volume. By removing barriers around follicles and gently cleansing the hair fiber, the shampoo helps strands sit with more lift and definition.

• Detoxifies scalp and hair from product buildup, minerals, and pollutants
• Niacinamide supports a healthier scalp environment for visibly fuller hair
• Humectant botanicals add body and surface shine to individual strands

Will it damage color or strip natural oils?

System 1 is designed for natural, non-chemically treated hair and cleanses without aggressive stripping. It aims to preserve the scalp’s essential oils while removing unwanted deposits, so hair retains moisture and elasticity after rinsing.

• Formulated to cleanse without harsh sulfation targeted at untreated hair
• Rinses clear to maintain natural shine and manageability
• Recommended frequency: daily use as part of a complete System 1 routine

How should I use Nioxin System 1 for best results?

For optimal performance follow a three-step approach: cleanse with the System 1 Cleanser, follow with the System 1 Scalp Therapy Conditioner, and finish with the Scalp & Hair Treatment. Consistent daily use helps maintain a clearer scalp surface and supports visible improvements over time.

• Apply to wet hair, massage into scalp and hair, lather for about one minute, then rinse
• Pair with the matching conditioner and topical treatment for the full protocol
• Visible improvements reported with regular use within weeks; results vary by individual

What active ingredients are in the formula and what do they do?

The shampoo combines targeted actives and botanicals to cleanse and fortify. Ingredients like niacinamide and biotin are included to support scalp condition and hair strength, while plant-derived humectants restore body and moisture balance.

• Niacinamide: helps maintain a balanced scalp environment
• Biotin: supports resilient hair structure and reduced breakage
• Botanical humectants: retain moisture and boost hair surface texture

Who this is for: Nioxin System 1 Cleanser is aimed at people with natural, non-chemically treated hair experiencing light thinning who want a salon-quality, daily-use shampoo. It’s suitable for those who prioritize scalp health, seek fuller-looking hair without heavy residues, and intend to use a coordinated three-step regimen for best outcomes.

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