NIOXIN Scalp & Hair Thickening Serum for Color-Treated Hair — System 3 6.8 fl oz, Lightweight Leave-On

Nioxin System 3 Scalp + Hair Thickening Treatment is a leave-on serum designed to nourish the scalp and increase individual hair strand diameter for fuller-looking, color-treated hair with light thinning.

This leave-in step completes Nioxin’s three-part System 3 routine, formulated specifically for color-treated, damaged hair showing early thinning. The lightweight serum uses Nioxin’s Transactive Delivery System 2.0 to deliver nutrients, antioxidants and botanicals to the scalp and hair shaft, aiming to boost texture, reduce breakage and protect hair color while improving overall scalp condition.

How does this treatment make hair look thicker?

The formula works by increasing the effective diameter of each hair strand and improving hair texture so hair appears fuller and more substantial. It leaves a light coating that amplifies body without weighing hair down.

• Increases strand diameter to create visible fullness
• Improves texture for more lift at the root
• Lightweight, leave-on application maintains natural movement

Will this product protect color-treated hair and reduce breakage?

Yes — System 3 is formulated for colored, damaged hair with light thinning and includes ingredients to help defend against mechanical and environmental stress. The treatment helps strengthen hair resilience, which can reduce breakage and preserve color vibrancy when used as directed.

• Supports hair strength to minimize snap and split ends
• Helps shield strands from everyday wear that fades color
• Designed to be the final, non-greasy step in the Nioxin system

How do I use the Scalp + Hair Thickening Treatment in my routine?

Use this leave-on serum as the last step after cleansing and conditioning with the matching Nioxin System 3 products. Apply directly to the scalp and through lengths on damp hair, then style normally — no rinse needed.

• Apply to clean, towel-dried hair focusing on the scalp
• Use daily or as indicated to support consistent results
• Pair with System 3 cleanser and conditioner for best performance

What scalp and hair benefits can I expect to see?

The treatment aims to create a healthier environment for hair by nourishing the scalp and removing buildup that can interfere with hair condition. Many users report improvements in fullness, density appearance and shine when the full system is used consistently.

• Delivers antioxidants and botanicals to nourish the scalp
• Helps reduce residue and excess sebum that can clog follicles
• Enhances shine and overall hair manageability

Who is this for: Nioxin System 3 Scalp + Hair Thickening Treatment is made for people with color-treated, damaged hair experiencing light thinning who want a salon-grade, leave-on solution. It suits those seeking a lightweight, daily finishing serum to improve strand thickness, protect color, and support a healthier scalp without adding weight or stickiness.

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