NIOXIN System 4 Scalp + Hair Conditioner — 33.8 fl oz for Colored, Damaged Hair | Niacinamide & Biotin, Density-Boosting

Nioxin System 4 Scalp + Hair Conditioner is a lightweight, density-protecting conditioner formulated to moisturize and strengthen colored, damaged hair with progressed thinning to create thicker, fuller-looking hair.

Designed as the second step in Nioxin’s three-part regimen, this 33.8 fl oz professional conditioner pairs BioAmp technology with active botanicals like niacinamide and biotin to support a healthy scalp environment and reinforce fragile strands. It’s crafted for color-treated, weakened hair that shows signs of progressive thinning, helping retain moisture balance while improving hair resilience and appearance.

How does this conditioner support the scalp and hair structure?

The formula focuses on scalp health to create a supportive foundation for hair. Lightweight conditioning agents moisturize without weighing hair down, while BioAmp technology helps amplify hair structure so each strand appears fuller and stronger.

• Targets the scalp to remove residue and help maintain a healthy environment
• BioAmp tech helps strengthen and add structure to weakened fibers
• Niacinamide and biotin contribute to visibly improved strand resilience
• Non-heavy moisturizing system preserves volume for finer, colored hair

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

Visible improvements in hair thickness and fullness are commonly reported with consistent use. Nioxin clinical messaging and consumer feedback point to perceptible changes in density and texture as early as a few weeks, when used as part of the full System 4 routine.

• Per consumer feedback: many users notice thicker-looking hair and increased fullness
• Designed to strengthen hair to reduce breakage that contributes to thinning appearance
• Best results when used daily after the System 4 cleanser and followed by the treatment step

How should I use the System 4 conditioner for best effects?

Use as the second step after your Nioxin System 4 Cleanser Shampoo. Work the conditioner through wet hair and directly onto the scalp, leave it on briefly, then rinse thoroughly to maximize moisture balance and strand support without build-up.

• Apply directly after shampooing, distributing from roots to ends
• Leave on for 1–3 minutes to allow actives to work, then rinse well
• Use daily as part of the three-step System 4 protocol for consistent benefits
• Pair with the Scalp & Hair Treatment for added thickening and protection

Will this preserve my color-treated hair while addressing thinning?

The lightweight, moisture-balancing formula is specifically developed for colored hair with progressed thinning. It conditions and helps fortify strands while minimizing factors that can accelerate color fade or breakage.

• Formulated for color-treated and chemically processed hair types
• Helps strengthen fragile, damaged hair to protect against breakage
• Moisturizes without heavy residue that can dull color or flatten volume

Who is this for: Nioxin System 4 Scalp + Hair Conditioner is intended for people with color-treated, damaged hair experiencing progressed thinning who want a salon-grade, lightweight conditioner that improves strand resilience and scalp health. It’s suited for daily use as part of a targeted three-step regimen and for those seeking visible fullness while protecting hair color and minimizing breakage.

Ingredients

Aqua, Cetyl Alcohol, Stearamidopropyl Dimethylamine, Stearyl Alcohol, Quaternium-18, Phenoxyethanol, Benzyl Alcohol, Cetearyl Alcohol, Hydroxypropyl Guar, Bis-Aminopropyl Dimethicone, Glyceryl Stearate, Oleyl Alcohol, Methylparaben, Propylparaben, Polysorbate 60, Mentha Piperita Oil, Mentha Arvensis Leaf Oil, Menthol, EDTA, Hydroxyethylcellulose, Citric Acid, Propylene Glycol, Camellia Sinensis Leaf Extract, Cystine Bis-PG-Propyl Silanetriol, Biotin, Lecithin, Niacinamide, Panthenol, 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, CI 42090, Potassium Sorbate, Sodium Benzoate