NIOXIN Scalp + Hair Thickening System 1 — For Natural/Untreated Hair, 3‑Month Kit with Niacinamide & Biotin

Nioxin System 1 is a three-step scalp and hair thickening kit formulated to strengthen natural, untreated hair with light thinning and boost visible fullness in about 30 days.

Designed by a salon brand with decades of experience in thinning hair, this full-size 3-month supply combines a clarifying cleanser, a lightweight conditioner, and a leave-in scalp treatment to reduce breakage, refresh the scalp, and amplify strand texture. The formulation features ingredients such as niacinamide and biotin and follows a skin-care-inspired approach to scalp health that helps create conditions for hair to appear denser.

How does System 1 reduce breakage and make hair look thicker?

System 1 targets the causes of mechanical and environmental breakage by cleansing residue that can clog follicles and by strengthening each strand's resilience. Regular use improves texture so individual hairs sit fuller and reflect more light, creating the impression of thicker hair.

• Step 1 cleanser removes sebum, fatty acids, and environmental residues.
• Step 2 lightweight conditioner restores moisture balance without weighing hair down.
• Step 3 leave-in treatment refreshes the scalp and increases volume at the roots.

What should I expect when using the kit daily?

Within weeks most users notice improved density and stronger hair against breakage; clinical testing reports visible changes in about 30 days. For best results, follow the three-step routine: shampoo, condition, and finish with the leave-in treatment applied to the scalp.

• Massage cleanser into scalp and rinse thoroughly to clear buildup.
• Apply conditioner from scalp to ends, then rinse to maintain lightweight control.
• Shake and apply the leave-in scalp treatment; do not rinse to allow active ingredients to work.

Which hair types and concerns is System 1 intended for?

System 1 is formulated specifically for natural or untreated hair experiencing light thinning. It’s not intended to alter chemical textures (e.g., colored or chemically treated hair) but rather to restore fuller-looking body and improve scalp condition for naturally textured hair.

• Best for natural, untreated hair with mild thinning.
• Not formulated for chemically processed or textured-treated hair systems.
• Compatible with other Nioxin Intensive Care supplements for added support.

Which ingredients help scalp health and how do they work?

The kit combines scalp-focused actives and botanicals that cleanse, condition, and invigorate the scalp environment. Niacinamide and biotin-related components support strand thickness and scalp vitality while antioxidants and clarifying agents reduce follicle-clogging buildup.

• Niacinamide helps improve scalp surface condition and appearance.
• Biotin-related components support hair’s natural structure and thickness perception.
• Clarifying agents remove sebum and environmental residue to free follicles.

Who is this for: Nioxin System 1 is for anyone with natural, untreated hair who is noticing light thinning and wants a salon-developed, scalp-focused routine to strengthen hair, reduce breakage, and create fuller-looking strands. If you use chemical treatments or have moderate to advanced thinning, consider checking Nioxin’s other system options tailored to those needs.

Ingredients

CLEANSER: 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 CONDITIONER: Aqua, Cetyl Alcohol, Stearamidopropyl Dimethylamine, Quaternium-18, Stearyl Alcohol, Bis-Aminopropyl Dimethicone, Hydroxyethylcellulose, Phenoxyethanol, Benzyl Alcohol, Cetearyl Alcohol, Mentha Piperita Oil,Mentha Arvensis Leaf Oil, Menthol, Glyceryl Stearate, Oleyl Alcohol,Methylparaben, PEG-2M, Propylparaben, Polysorbate 60, EDTA, Propylene Glycol, Citric Acid, Limonene, Camellia Sinensis Leaf Extract, Silica, Cystine Bis-PG-Propyl Silanetriol, Biotin, Lecithin, Niacinamide, Panthenol, Tocopheryl Acetate, Citrus Paradisi Peel Extract, Humulus Lupulus Flower Extract, Urtica Dioica Leaf Extract, Faex Extract, BHT, Acer Saccharum Extract, Citrus Limon Peel Extract, Saccharum Officinarum Extract, Vaccinium Myrtillus Leaf Extract, Citrus Aurantium Dulcis Fruit Extract, CI 42090, Potassium Sorbate, Sodium Benzoate HAIR & SCALP TREATMENT: Aqua, Niacinamide, Caffeine, Phenoxyethanol, Sodium Benzoate, Benzyl Alcohol, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Polysorbate 60, Polysorbate 80, Acetamide MEA, Triethanolamine, Propylene Glycol, PEG-23M, Tetrasodium EDTA, Methyl Nicotinate, Parfum, PEG-30 Dipolyhydroxystearate, Mentha Piperita Oil, Mentha Arvensis Leaf Oil, Menthol, Trideceth-6, Camellia Sinensis LeafExtract, Limonene, Silica, Cystine Bis-PG-Propyl Silanetriol, Biotin, Lecithin, Tocopheryl Acetate, Citrus Paradisi Peel Extract, Humulus Lupulus Flower Extract, Urtica Dioica Leaf Extract, Faex Extract, Acer Saccharum Extract, Citrus Limon Peel Extract, Saccharum Officinarum Extract, Vaccinium Myrtillus Leaf Extract, Citrus Aurantium Dulcis Fruit Extract, Potassium Sorbate