NIOXIN Scalp + Hair Thickening System 4 — Trial Size for Color-Treated, Damaged Hair with Niacinamide & Biotin

Nioxin System 4 is a three-step salon-grade kit that helps visibly thicken colored, dry, and damaged hair with progressed thinning while refreshing the scalp.

This trial-size System 4 from Nioxin combines a cleanser shampoo, lightweight conditioner, and leave-in scalp treatment formulated for color-treated hair with advanced thinning. The regimen is built on a scalp-first approach—removing sebum and residue that can clog follicles, supporting moisture balance and strengthening strands to reduce breakage. Key actives include niacinamide and biotin, supported by botanicals and UV-protecting ingredients to maintain color vibrancy as you work toward fuller-looking hair.

How does the three-step system work to make hair appear thicker?

The System 4 regimen uses a sequence: cleanse, condition, and treat. The shampoo clears excess oils and environmental buildup; the conditioner detangles while restoring resilience; the leave-in formula boosts scalp health and lifts roots for added volume.

• Step 1: Cleanser shampoo removes sebum, debris, and styling residues.
• Step 2: Scalp therapy conditioner balances moisture without weighing hair down.
• Step 3: Scalp & Hair Treatment is a leave-in that refreshes the scalp and increases visible volume.
• Clinical observations report improved thickness, density, and fullness within 30 days for many users.

Will System 4 protect my color-treated hair while addressing thinning?

Yes—System 4 is formulated specifically for colored, damaged hair with progressed thinning. It cleans gently and conditions to preserve color integrity while strengthening hair to help reduce breakage that contributes to thinning.

• Ingredients selected to maintain color vibrancy and reduce fading.
• Lightweight conditioning avoids flattening color-treated strands.
• Antioxidant and UV-protecting components help shield hair from environmental stressors.

How quickly will I notice results and how should I use the trial kit?

Many users see visible improvement in thickness and fullness in about 30 days when the three-step routine is followed consistently. For best results, use the products in order: massage the cleanser into scalp and rinse, apply conditioner from scalp to ends then rinse, and finish with the leave-in treatment applied directly to the scalp (do not rinse).

• Use regularly—follow the three-step sequence every wash.
• The trial-size supplies approximately one month of daily or regular use depending on hair length.
• Complement with Nioxin Intensive Care products for targeted support.

What does the formula do for scalp health and breakage prevention?

System 4 focuses on the scalp as the foundation for healthier-looking hair, reducing follicle-clogging sebum and residues that interfere with hair appearance. Strengthening agents in the formulas help improve strand resilience to minimize breakage, which supports the appearance of increased density over time.

• Removes buildup that can hinder healthy hair growth environment.
• Strengthens hair fibers to reduce breakage-related thinning.
• Supports moisture balance to prevent further damage and brittleness.

Who is this for? Nioxin System 4 Trial Kit is intended for people with color-treated, dry or damaged hair experiencing progressed thinning who want a concentrated, salon-originated regimen to improve visible thickness and scalp condition. It’s suitable for anyone seeking a gentle, three-step approach to remove residue, restore moisture balance without weight, and refresh the scalp while protecting color. Consider this trial size if you want to evaluate the system for about a month before committing to larger sizes or pairing with specialized Nioxin Intensive Care treatments.

Ingredients

NIOXIN® SHAMPOO: Aqua, Sodium Laureth Sulfate, Sodium Lauryl Sulfate, Citric Acid, Sodium Chloride, PPG-2 Hydroxyethyl Coco/Isostearamide, Sodium Citrate, Sodium Xylenesulfonate, Sodium Benzoate, Salicylic Acid, Sodium Hydroxide, Tetrasodium EDTA, Mentha Piperita Oil, Mentha Arvensis Leaf Oil, Menthol, Trisodium Ethylenediamine Disuccinate, Methylparaben, Polyquaternium-10, Propylene Glycol, Camellia Sinensis Leaf Extract, Cystine Bis-PG-Propyl Silanetriol, Biotin, Lecithin, Niacinamide, Panthenol, Tocopheryl Acetate, Foeniculum Vulgare Fruit Extract, Sodium Acetate, Isopropyl Alcohol, CI 19140, Faex Extract, Acer Saccharum Extract, Citrus Limon Peel Extract, Saccharum Officinarum Extract, Vaccinium Myrtillus Leaf Extract, CI 42090, Citrus Aurantium Dulcis Fruit Extract, CI 17200, Potassium Sorbate CONDITIONER: 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 TREATMENT: Aqua, Phenylbenzimidazole Sulfonic Acid, Niacinamide, Benzophenone-4, Caffeine, Polysorbate 20, Sodium Hydroxide, Benzyl Alcohol, Sodium Benzoate, Phenoxyethanol, PEG-12 Dimethicone, Citric Acid, Cocamidopropyl Betaine, Acetamide MEA, Isopropyl C12-15-Pareth-9 Carboxylate, Tetrasodium EDTA, Propylene Glycol, Methyl Nicotinate, Sodium Chloride, Parfum, Polysorbate 60, Polysorbate 80, Mentha Piperita Oil, Mentha Arvensis Leaf Oil, Menthol, PEG-23M, Camellia Sinensis Leaf Extract, Limonene, Cystine Bis-PG-Propyl Silanetriol, Biotin, Lecithin, Tocopheryl Acetate, Foeniculum Vulgare Fruit Extract, Silica, Faex Extract, Acer Saccharum Extract, Citrus Limon Peel Extract, Saccharum Officinarum Extract, Vaccinium Myrtillus Leaf Extract, Citrus Aurantium Dulcis Fruit Extract, Potassium Sorbate