NIOXIN Scalp + Hair Thickening System 2 Leave-In Treatment 3.4 fl oz — for Natural/Untreated Hair, Reduces Breakage and Boosts Ful

Built as the finishing step in Nioxin System 2, this 3.4 fl oz leave-in treatment targets natural or untreated hair showing advanced thinning. The formulation combines antioxidants, botanicals, and scalp-conditioning ingredients to refresh the scalp environment, help reduce breakage, and support hair that appears fuller. It’s intended for daily use after cleansing and conditioning with the matching System 2 products to strengthen strand structure and boost density appearance.

How does this treatment help hair that’s thinning from breakage?

The leave-on formula focuses on strengthening hair resilience to reduce snapping and split ends that contribute to visible thinning. Rather than masking problems, it targets the scalp and mid-lengths to improve the environment around follicles and reinforce weakened strands.

• Contains Scalp Access 2.0 technology to condition scalp and hair fiber.
• Nourishing botanicals and antioxidants to protect against environmental stressors.
• Leave-in application keeps actives on the scalp to continuously condition.
• Works with System 2 shampoo and conditioner for best results.

What results can I expect and how quickly will I see them?

Visible changes in thickness and fullness have been reported by many users within a month when used consistently as part of the three-step System 2 routine. Individual results vary based on hair condition and adherence to the program.

• Clinically observed improvements in thickness and fullness in as little as 30 days for some users.
• Helps reduce breakage, contributing to increased density over time.
• Daily leave-on use supports ongoing scalp nourishment and protection.

How should I apply the leave-in treatment for best effect?

Apply the treatment to a clean, towel-dried scalp after using the System 2 shampoo and conditioner. Work the product into the scalp and through the hair, then style as usual; do not rinse out. Consistent daily application gives the best chance for sustained improvement.

• Use after cleansing with Nioxin System 2 shampoo and conditioner.
• Part hair and apply directly to the scalp along sections for even coverage.
• Massage gently to distribute active ingredients, then leave in—no rinse needed.
• Follow with styling products as desired; safe for daily use.

Is this appropriate for my hair type and scalp sensitivity?

This product is formulated specifically for natural or untreated hair with progressed thinning and is part of a targeted system. If you have an unusually sensitive scalp or known allergies, check the ingredient list and perform a patch test before regular use.

• Designed for natural, untreated hair experiencing progressed thinning.
• Supports scalp balance without heavy residue when used as directed.
• Consult a dermatologist or trichologist if you have severe scalp conditions.
• Patch test recommended for allergy-prone users.

Who is this for? Nioxin Scalp + Hair Thickening System 2 Leave-On Treatment is aimed at people with natural or untreated hair showing signs of progressed thinning who want a salon-level, daily leave-in solution to nourish the scalp, strengthen strands, and create the appearance of thicker, fuller hair. It’s best used as the final step in the System 2 three-part routine and is appropriate for those seeking non-styling, treatment-focused support rather than temporary cosmetic coverage.

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