Nioxin System 1 Scalp + Hair Thickening Treatment is a leave-in scalp treatment for natural, untreated hair with light thinning. Formulated with niacinamide, caffeine, and wild mint oil, it's designed to nourish the hair root and support the appearance of thicker, fuller hair with consistent use.

The lightweight, no-rinse formula is applied directly to the scalp rather than through the lengths of the hair, and it's intended to be used alongside Nioxin's System 1 shampoo and conditioner, which are formulated for the same natural-hair, light-thinning concern. In Nioxin's own consumer testing, 85% of users reported a thickening effect and 80% reported increased hair density and fullness after 30 days of regular use.

• Formulated specifically for natural, non-color-treated hair
• Leave-in — not rinsed out after application
• Best used as part of the full System 1 routine (shampoo, conditioner, treatment)

Water, Niacinamide, Caffeine, Phenoxyethanol, Sodium Benzoate, Benzyl Alcohol, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Polysorbate 60, Polysorbate 80, Acetamide MEA, Triethanolamine, PEG-23M, Propylene Glycol, Tetrasodium EDTA, Methyl Nicotinate, Fragrance, Mentha Arvensis Leaf Oil, Mentha Piperita (Peppermint) Oil, PEG-30 Dipolyhydroxystearate, Trideceth-6, Limonene, Camellia Sinensis Leaf Extract, Silica, Cystine Bis-PG-Propyl Silanetriol, Biotin, Lecithin, Tocopheryl Acetate, Humulus Lupulus (Hops) Flower Extract, Citrus Paradisi (Grapefruit) Peel Extract, Urtica Dioica (Nettle) Leaf Extract, Acer Saccharum (Sugar Maple) Extract, Citrus Limon (Lemon) Peel Extract, Saccharum Officinarum (Sugar Cane) Extract, Vaccinium Myrtillus Leaf Extract, Yeast Extract, Propylparaben, Citrus Aurantium Dulcis (Orange) Fruit Extract, BHT, Potassium Sorbate, Maltodextrin, Methylparaben, Ethylparaben, Butylparaben