NIOXIN System 2 Leave-In Scalp & Hair Thickening Treatment, 6.7 fl oz — Niacinamide & Biotin for Natural Hair Density

Nioxin System 2 Scalp & Hair Thickening Leave-In Treatment is a daily leave-in formula that nourishes the scalp and reinforces natural hair to appear thicker and resist breakage.

This treatment is the finishing step of Nioxin's System 2 regimen, created for naturally textured hair showing progressed thinning. It combines a targeted delivery system with ingredients like niacinamide and biotin plus botanical antioxidants to refresh the scalp environment and strengthen hair strands. Designed to work with the System 2 Cleanser and Scalp Therapy Conditioner, the leave-in is lightweight, non-rinse, and suitable for daily use to support the look of increased density and improved scalp condition.

How does this leave-in treatment support a healthier scalp?

The formula focuses on scalp balance by delivering nutrients and antioxidants directly to the skin and hair roots. A refreshed, less congested scalp creates a better foundation for hair resilience without heavy residue.

• Scalp Access 2.0 delivery system targets nutrients at the scalp surface.
• Includes antioxidants and botanicals to help protect against environmental stressors.
• Lightweight, non-greasy texture avoids build-up that can block follicles.

What visible improvements can I expect and how quickly?

Many users notice fuller-looking hair and improved hair structure within weeks when the full System 2 routine is followed. Results depend on individual hair condition and consistent daily application.

• Clinically reported increases in perceived thickness and density in consumer testing.
• Designed to reduce breakage, helping hair appear fuller over time.
• Visible improvements are typically observed within a month with continued use.

How should I apply this treatment for best results?

Application is simple: apply directly to the entire scalp and massage gently—do not rinse out. Use every day as the final step after shampooing and conditioning with the System 2 products to maintain an optimal scalp environment.

• Apply to clean, towel-dried or dry scalp and distribute evenly by massaging.
• Leave in—no rinse required—so active ingredients remain working between washes.
• Pair with Nioxin System 2 Cleanser Shampoo and Scalp Therapy Conditioner for complementary benefits.

Are there specific ingredients that help thinning natural hair?

The treatment blends supportive molecules like niacinamide and biotin with botanical extracts and antioxidants to reinforce strand strength and scalp health. These ingredients aim to protect hair from breakage while improving the appearance of fullness without weighing hair down.

• Niacinamide helps support scalp skin condition and appearance.
• Biotin contributes to the feel of stronger hair strands.
• Botanical antioxidants and UV-protecting agents shield hair from daily stressors.

Who is this for: This leave-in is formulated for people with natural-textured hair experiencing progressed thinning who want a non-rinse, salon-grade treatment to bolster hair strength and improve the look of density. It’s intended for daily use as part of Nioxin System 2 and suits those seeking lightweight, professional scalp care without medicated actives. If you follow a routine to reduce breakage and maintain scalp health, this product can help support those goals.

Ingredients

Water/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, Propylene Glycol, Tetrasodium Edta, Methyl Nicotinate, Sodium Chloride, Parfum, Polysorbate 60, Polysorbate80, Mentha Piperita Oil, Menthol, Mentha Arvensis Leaf Oil, Peg-23m, Camellia Sinensis Leaf Extract, Limonene, Cystine Bis-Pg-Propyl Silanetriol, Biotin, Lecithin, Tocopheryl Acetate, Citrus Paradisi, Peel Extract, Humulus Lupulus Flower Extract, Urtica Dioica Leaf Extract, Silica, Faex extract, Acer Saccharum Extract, Citrus Limon Peel Extract, Saccharum Officinarum Extract, Vaccinum Myrtillus Leaf Extract, Citrus Aurantium Dulcis Fruit Extract, Potassium Sorbate