NIOXIN Scalp + Hair Thickening Leave-In Treatment System 2, 3.4 fl oz — Lightweight, Strengthening for Natural Thinning Hair

NIOXIN Scalp + Hair Thickening System 2 Leave-In Treatment is a lightweight, leave-on formula designed to nourish the scalp and visibly boost the appearance of thickness for natural or untreated hair with progressed thinning.

Based on NIOXIN’s decades of research into thinning hair, this final step in the System 2 regimen supplies antioxidants, botanicals and protective ingredients to fortify hair strands and refresh the scalp environment. The non-greasy solution targets breakage and helps hair look fuller without weighing it down, making it a practical addition to a daily grooming routine for those seeking more resilient-looking natural hair.

How does this leave-in treatment improve the look of thinning hair?

The formula works by reinforcing the hair shaft and improving the scalp’s surface condition, which together create a fuller visual effect. Rather than adding temporary fibers, it addresses hair strength and scalp clarity so hair appears thicker over time.

• Delivers botanicals and antioxidants to nourish follicles and strands
• Strengthens against breakage to preserve existing hair density
• Leaves a non-sticky finish that keeps volume without residue

How should I use the NIOXIN System 2 treatment in my routine?

Apply the leave-on treatment after cleansing and conditioning with the corresponding System 2 products for best results. Massage a measured amount into the scalp and distribute through mid-lengths, then style as usual; no rinse required.

• Use daily or as directed after shampoo and conditioner
• Focus application on areas with noticeable thinning or breakage
• Compatible with styling products and color-treated hair

What visible benefits can I expect and when might I see them?

Users often report improved hair fullness, density, and thicker-feeling strands within weeks when used consistently as part of System 2. Results depend on individual hair condition and adherence to the full routine, with some users noticing changes in as little as 30 days.

• Improved fullness and body in targeted areas
• Reduced appearance of breakage and frayed ends
• Scalp feels cleaner and better balanced for healthier-looking hair

Are there ingredients or features that protect hair from daily damage?

The blend includes antioxidants and UV-protecting components that help shield hair from environmental stressors, while nourishing extracts help soothe and maintain scalp health. The lightweight vehicle ensures protection without heaviness, preserving natural movement.

• Antioxidants combat oxidative stress on hair and scalp
• UV-protecting agents help reduce sun-related fading and weakening
• Botanical extracts hydrate and help maintain a balanced scalp

Who is this for: NIOXIN Scalp + Hair Thickening System 2 Leave-In Treatment is formulated for people with natural or untreated hair experiencing progressed thinning who want a salon-grade, leave-in product to strengthen hair, reduce breakage, and improve the appearance of fullness. It’s suitable for daily use as the finishing step in the System 2 regimen and for anyone seeking a non-greasy option that supports scalp health while preserving style and movement.

Ingredients

Water/Aqua, Phenylbenzimidazole Sulfonic Acid, Niacinamide, Benzophenone-4, Caffeine, Polysorbate 20, Sodium Hydroxide, Benzyl Alcohol, Sodium Benzoate, Phenoxyethanol, Peg-12 Dimethicone, Citric Acid, Cocamidopropyl Betaine, Acetamide Mea, Isopropyl C12-15-Pareth-9 Carboxylate, Propylene Glycol, Tetrasodium Edta, Methyl Nicotinate, Sodium Chloride, Parfum, Polysorbate 60, Polysorbate80, Mentha Piperita Oil, Menthol, Mentha Arvensis Leaf Oil, Peg-23m, Camellia Sinensis Leaf Extract, Limonene, Cystine Bis-Pg-Propyl Silanetriol, Biotin, Lecithin, Tocopheryl Acetate, Citrus Paradisi, Peel Extract, Humulus Lupulus Flower Extract, Urtica Dioica Leaf Extract, Silica, Faex extract, Acer Saccharum Extract, Citrus Limon Peel Extract, Saccharum Officinarum Extract, Vaccinum Myrtillus Leaf Extract, Citrus Aurantium Dulcis Fruit Extract, Potassium Sorbate