NIOXIN Scalp + Hair Thickening Treatment for Color-Treated Hair — System 3, 6.8 fl oz lightweight leave-in to boost strand diamete

Nioxin System 3 Scalp + Hair Thickening Treatment is a leave-in serum designed to refresh the scalp and increase the visible thickness and fullness of color-treated, lightly thinning hair.

Built as the final step in Nioxin’s three-part System 3, this 6.8 fl oz treatment uses a targeted delivery system and a blend of antioxidants, botanicals, and nourishing ingredients to improve scalp condition and boost the diameter and resilience of individual strands. It’s formulated for color-treated, dry, or chemically processed hair with signs of light thinning to help create a fuller-looking finish without weighing hair down.

How does this treatment make hair look thicker?

The formula increases strand diameter and amplifies hair texture so each hair appears fuller from root to tip. Its Transactive Delivery System 2.0 helps active ingredients reach the scalp and hair shaft to support thickness and manageability.

• Boosts individual strand diameter to create fuller visual volume
• Leaves a lightweight finish that won’t flatten style
• Helps reduce breakage for improved hair resilience

What benefits does it provide for color-treated or damaged hair?

System 3 is formulated specifically for color-treated, dry, or chemically processed hair showing light thinning. The treatment protects and supports hair structure while helping maintain color vibrancy and polish.

• Designed for color-treated hair to preserve tone and shine
• Nourishes and helps fortify weakened lengths against breakage
• Delivers antioxidants and botanical extracts to refresh the scalp

How do I use the Nioxin Scalp + Hair Thickening Treatment?

Use as the final step in the System 3 routine on clean, towel-dried hair. Apply directly to the scalp across sections, then style as usual; this is a leave-in treatment—do not rinse out.

• Apply to scalp and roots after shampoo and conditioner in the System 3 kit
• Use daily or as directed for consistent results
• Works with other styling products and heat tools

What results can I reasonably expect and when?

Clinical user feedback reports improved thickness, density, and fullness with regular use; many users notice visible changes within about 30 days when used as directed as part of the System 3 regimen. Individual outcomes vary based on hair condition and consistency of use.

• Users reported increased fullness and hair density with routine use
• Helps minimize visible thinning by strengthening and protecting strands
• Provides a healthier scalp environment that supports styling and manageability

Who is this for: Nioxin System 3 Scalp + Hair Thickening Treatment is best for people with color-treated, chemically processed, or dry hair showing signs of light thinning who want a salon-originated, leave-in product to boost strand diameter, improve texture, and refresh scalp condition. It’s not a medical treatment; rather, it’s a targeted cosmetic step to enhance appearance, resilience, and manageability when used consistently as part of the System 3 routine.

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