NIOXIN Scalp + Hair Thickening System 4 Trial Kit for Color‑Treated/Damaged Hair with Niacinamide & Biotin

Nioxin Scalp + Hair Thickening System 4 is a three-step trial kit that visibly thickens color-treated, dry or damaged hair while protecting color and refreshing the scalp.

Designed for hair with progressed thinning, this compact one-month regimen uses targeted cleansing, lightweight conditioning, and a leave-in scalp treatment to strengthen strands and reduce breakage. Formulated with ingredients such as niacinamide and biotin and informed by Nioxin's scalp-centered approach, System 4 focuses on follicle environment, moisture balance and hair resilience without weighing color-treated hair down.

How does System 4 help make hair look thicker?

System 4 works by clearing build-up that can clog follicles and by supporting strand strength so hair is less prone to breakage. The combined action of the cleanser, conditioner and leave-in formula increases hair diameter appearance and helps hair sit fuller at the root.

• Step 1 shampoo removes sebum and environmental residues that flatten hair.
• Step 2 conditioner controls moisture without heavy residue for added body.
• Step 3 leave-in treatment refreshes the scalp and boosts volume at the roots.
• Clinical user feedback reports visible thickening and improved fullness within 30 days.

Will System 4 protect my color-treated hair?

This regimen is formulated specifically for colored and chemically treated hair, so it balances cleansing power with gentleness to help preserve color vibrancy. UV-protecting antioxidants and color-safe surfactants help maintain tone while addressing thinning concerns.

• Conditioner helps seal and smooth cuticles to lock in color.
• Antioxidant ingredients protect strands from environmental stressors.
• The leave-in treatment refreshes the scalp without stripping dyes.

How should I use the three-step kit for best results?

Follow the three-step sequence routinely: cleanse, condition, then apply the concentrated leave-in treatment. Consistent nightly or daily application of the leave-in product helps sustain a refreshed scalp environment and visible fullness.

• Step 1: Massage shampoo into scalp and hair, then rinse thoroughly.
• Step 2: Apply conditioner from scalp to ends, leave briefly, then rinse.
• Step 3: Shake the leave-in, apply directly to scalp, do not rinse; style as usual.
• Use daily; most users notice improved appearance within about 30 days.

What ingredients support scalp health and hair resilience?

System 4 includes scalp-targeted actives like niacinamide and biotin paired with botanicals and antioxidants to support a healthier scalp surface and stronger strands. The formula focuses on removing follicle-clogging debris while maintaining moisture balance to reduce breakage.

• Niacinamide encourages a balanced scalp environment for improved strand presentation.
• Biotin supports hair resilience and decreases snap-prone ends.
• Botanical extracts and UV filters help protect against daily environmental wear.

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 salon-grade, scalp-focused routine in a convenient one-month supply. It's suitable for anyone wanting to reduce breakage, refresh the scalp, and achieve a visibly fuller look without compromising color. For continued results, incorporate System 4 into an ongoing regimen or pair it with Nioxin Intensive Care products and subscribe for regular deliveries.

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