NIOXIN Scalp + Hair Thickening Treatment serum for color-treated hair, 3.4 fl oz — lightweight, strand-thickening formula

Nioxin System 3 Scalp + Hair Thickening Treatment is a leave-on serum that helps increase hair strand diameter and supports a healthier scalp for color-treated, damaged hair with light thinning.

This professional-strength finishing treatment is the third step in Nioxin's System 3 regimen, formulated to improve the look of fullness and amplify texture while protecting color-treated hair from breakage. Using a targeted Transactive Delivery System 2.0, the serum deposits nutrients, antioxidants, and botanicals to the scalp and hair shaft to create a more resilient foundation for hair that appears thicker and more manageable.

How does this treatment add visible thickness to hair?

The formula works at the strand level to increase diameter and improve texture so hair appears fuller without weighing it down. Many users see measurable changes in fullness and density within a month when used as directed with the System 3 regimen.

• Transactive Delivery System 2.0 targets scalp and hair for strand-thickening effects.
• Lightweight leave-on serum that adds body without residue.
• Visibly amplifies texture to make existing hair look denser.

What scalp and hair concerns is System 3 intended to address?

System 3 is designed specifically for color-treated, damaged hair showing light thinning. It focuses on creating a balanced scalp environment and reinforcing hair resilience to reduce breakage and improve overall appearance.

• Removes buildup and excess sebum that can stress follicles.
• Nourishes the scalp with antioxidants and botanicals for improved condition.
• Protects color-treated strands while reducing visible thinning.

How should I use the Scalp + Hair Thickening Treatment for best results?

Apply as the final, leave-in step of Nioxin System 3 after cleansing and conditioning with the kit's steps. Focus application on the scalp and roots, then style as usual; consistent use yields the best visible improvements.

• Use daily or as directed after System 3 shampoo and conditioner.
• Dispense to the scalp in sections for even coverage at the roots.
• Do not rinse out — leave the serum to work throughout the day.

What results can I reasonably expect and when?

Individual results vary, but clinical feedback shows many users notice thicker-looking hair, increased fullness, and reduced breakage within about 30 days of regular use. The product is intended to improve cosmetic appearance rather than change hair growth patterns.

• Many users report visible fullness and density improvements in 30 days.
• Helps minimize breakage to preserve length and volume over time.
• Works best when used consistently with the full System 3 regimen.

Who is this for: Nioxin System 3 Scalp + Hair Thickening Treatment is aimed at people with color-treated, dry or damaged hair experiencing light thinning who want a salon-grade, leave-in option to boost strand diameter and improve scalp condition. It suits those seeking a non-greasy, daily finishing treatment to enhance fullness while protecting color and reducing breakage.

Ingredients

Aqua, Niacinamide, Caffeine, Phenoxyethanol, Sodium Benzoate, Benzyl Alcohol, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Polysorbate 60, Polysorbate 80, Acetamide MEA, Triethanolamine, PEG-23M, Tetrasodium EDTA, Propylene Glycol, 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, Foeniculum Vulgare Fruit Extract, Faex Extract, Acer Saccharum Extract, Citrus Limon Peel Extract, Saccharum Officinarum Extract, Vaccinium Myrtillus Leaf Extract, Citrus Aurantium Dulcis Fruit Extract, Potassium Sorbate