NIOXIN System 3 Scalp + Hair Thickening Treatment for Color-Treated Hair — 3.4 fl oz, Lightweight Leave-In Serum for Fuller Body

Designed as the final step in Nioxin's three-part System 3, this lightweight 3.4 fl oz treatment delivers antioxidants, botanicals, and nutrients directly to the scalp to help improve texture and protect against breakage. The Transactive Delivery System 2.0 targets each strand to boost diameter and create a fuller look while preserving color-treated hair's shine. Use it regularly after cleansing and conditioning for a refreshed scalp and amplified hair body.

How does this treatment make hair look thicker?

The formula works by increasing the apparent diameter and body of individual hair shafts, which produces a visibly fuller effect. It’s a leave-in serum so the results build with consistent use as the product coats and supports each strand.

• Transactive Delivery System 2.0 helps amplify strand diameter.
• Lightweight polymers add lift without weighing hair down.
• Daily leave-on application layers fullness over time.

Will it be safe for colored or damaged hair?

Nioxin System 3 is specifically formulated for color-treated, dry or damaged hair with light thinning. The treatment protects color and helps reduce breakage by improving scalp condition and hair resilience, so it integrates into a color-care routine without stripping or dulling tones.

• Color-safe formulation preserves vibrancy.
• Antioxidants and botanicals help nourish compromised hair.
• Non-greasy, lightweight finish avoids flattening styled hair.

How do I use this as part of the System 3 routine?

Apply the Scalp + Hair Thickening Treatment after shampooing and conditioning with Nioxin System 3 products. Section hair and massage the product into the scalp, then style as usual — no rinsing required. Consistent application maximizes visible fullness over weeks.

• Use on clean, towel-dried hair after System 3 shampoo and conditioner.
• Dispense and massage into the scalp across targeted zones.
• Leave in; style normally. Use daily or as recommended by your stylist.

What tangible benefits can I expect and when?

Many users report noticeable improvements in texture, fullness, and scalp condition within weeks. While individual results vary, the product is designed to support thicker-looking hair by increasing strand diameter and reducing breakage that can make hair appear sparse.

• Visible texture and fullness improvement with consistent use.
• Supports scalp health by removing impurities and nourishing follicles.
• Helps protect hair integrity, minimizing breakage and color fading.

Who is this for: Nioxin System 3 Scalp + Hair Thickening Treatment is made for people with color-treated, dry or damaged hair experiencing light thinning who want a salon-grade leave-in solution to boost fullness and scalp health. It suits those seeking a non-greasy, professional-strength treatment that fits into a regular wash-and-style routine and who want to maintain hair color while improving texture and manageability.

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