NIOXIN Scalp + Hair Thickening System 1 Leave-On Treatment, 3.4 fl oz — For Natural/Untreated Hair, Lightweight Volume

NIOXIN Scalp + Hair Thickening System 1 Leave-On Treatment is a salon-grade, lightweight leave-in that refreshes the scalp and increases hair strand fullness for natural or untreated hair with light thinning.

This leave-on treatment completes NIOXIN System 1 by delivering nutrients, antioxidants and plant extracts directly to the scalp to support a healthier-looking foundation for hair. Built with NIOXIN’s Transactive Delivery System 2.0, the formula aims to amplify hair texture and help reduce visible breakage while leaving hair shiny and touchable. It’s formulated for natural, untreated hair experiencing light thinning and designed to be used as the final step in a targeted three-part regimen.

How does this leave-on treatment improve hair fullness?

The treatment works at the hair shaft and scalp to make each hair feel and appear thicker. It uses delivery technology to deposit active ingredients where they support strand diameter and resilience, creating the impression of denser hair.

• Transactive Delivery System 2.0 helps transport beneficial molecules to the scalp and hair fiber
• Botanical extracts and antioxidants nourish the scalp environment
• Formulation increases strand texture for visibly fuller-looking hair

When and how should I use this product in my routine?

Use this leave-on treatment as the final step after cleansing and applying any NIOXIN conditioners from System 1. Apply to a towel-dried or dry scalp according to directions and style as usual—no rinsing required.

• Part hair and apply directly to the scalp for targeted coverage
• Use daily or as recommended to maintain results from the three-part system
• Follow with regular styling; the formula is lightweight and non-greasy

What benefits can I expect, and how quickly?

Many users notice improved hair texture and the appearance of more volume within weeks when the full system is used consistently. Outcomes vary, but the product is designed to strengthen hair resilience and reduce the visible effects of breakage that can make hair look thinner.

• Visibly thicker-looking hair with continued use
• Improved hair density and fullness reported by consumers
• Protects against breakage to help maintain strand length and body

How does this product support scalp health without harshness?

The formula contains gentle cleansers and nourishing compounds that avoid stripping the scalp of essential moisture. By removing excess oils and impurities and delivering antioxidants and botanicals, it helps create a balanced scalp environment conducive to healthier-looking hair.

• Removes sebum and residue that can weigh hair down
• Infuses the scalp with antioxidants and botanicals for nourishment
• Non-irritating, salon-formulated for daily use in System 1 routines

Who is this for: NIOXIN Scalp + Hair Thickening System 1 Leave-On Treatment is intended for people with natural or untreated hair experiencing light thinning who want a lightweight, professional-strength leave-in to enhance strand thickness and scalp condition. It is best used as the final step in NIOXIN’s three-part System 1 to maximize texture, shine and the appearance of fuller hair without heavy residue.

Ingredients

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 Leaf Extract, 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