NIOXIN Scalp + Hair Thickening Leave-In Treatment — 6.8 fl oz, Lightweight Daily Formula for Natural Hair with Light Thinning

This leave-in step completes Nioxin's three-part System 1 routine, formulated to refresh the scalp, increase strand diameter, and help hair look fuller without weighing it down. Built on Nioxin's Transactive Delivery System 2.0 technology and enriched with antioxidants and botanicals, the treatment aims to create a healthier scalp environment while adding texture and shine to natural hair types experiencing mild thinning.

How does this treatment make hair look thicker?

The formula targets each individual strand to increase its apparent thickness, giving a fuller look to the hair overall. It leaves a light coating that enhances texture and body, helping hair appear denser from root to tip.

• Transactive Delivery System 2.0 increases strand diameter for visibly fuller hair.
• Lightweight leave-on application builds texture without heaviness.
• Improves shine and manageability for a polished, thicker-looking finish.

Will this help my scalp's condition and daily styling routine?

The treatment is designed to refresh and balance the scalp while supplying nutrients and antioxidants that support scalp health. It can be used daily as a leave-in step, integrating easily with styling habits to improve texture and reduce breakage during combing or heat styling.

• Gently nourishes the scalp with botanicals and antioxidants.
• Helps remove surface impurities when used as part of the System 1 regimen.
• Adds lightweight texture that supports styling and reduces friction-related breakage.

How soon will I notice results, and what kind of changes are typical?

Results vary by individual, but many users report visible improvements in thickness and fullness within weeks when the complete System 1 is used as directed. Typical changes include increased strand fullness, enhanced texture, and improved scalp comfort rather than immediate hair growth.

• Clinical feedback: high percentages of users observed thicker-looking hair and increased fullness.
• Improved resilience and reduced breakage with regular use.
• Enhanced overall hair appearance—more body, more shine—over time.

How do I use the Scalp + Hair Thickening Treatment?

Apply the product as the final step in the System 1 protocol to clean, towel-dried or dry hair. Dispense an appropriate amount, distribute evenly through the scalp and hair focusing on areas with light thinning, and style as usual; it is formulated to remain on the hair as a leave-in treatment.

• Use after cleansing and conditioning with System 1 Shampoo and Conditioner for best results.
• Apply directly to the scalp and through lengths; do not rinse out.
• Suitable for daily use or as directed by a hair professional.

Who is this for: This Nioxin System 1 Scalp + Hair Thickening Leave-In Treatment is intended for people with natural or chemically untreated hair who notice light thinning and want a non-greasy, salon-strength option to improve scalp condition and create the appearance of fuller hair. It suits those seeking a daily leave-in product that layers well under styling products and complements a complete scalp-care regimen without altering hair color or texture dramatically.

Ingredients

WATER/EAU, NIACINAMIDE, CAFFEINE, PHENOXYETHANOL, SODIUM BENZOATE, BENZYL ALCOHOL, ACRYLATES/C10-30 ALKYL ACRYLATE CROSSPOLYMER, POLYSORBATE 60, POLYSORBATE 80, ACETAMIDE MEA, TRIETHANOLAMINE, PROPYLENE GLYCOL, PEG-23M, TETRASODIUM EDTA, METHYL NICOTINATE, FRAGRANCE/PARFUM, PEG-30 DIPOLYHYDROXYSTEARATE, MENTHA PIPERITA (PEPPERMINT) OIL, MENTHA ARVENSIS LEAF OIL, MENTHOL, TRIDECETH-6, CAMELLIA SINENSIS LEAF EXTRACT, LIMONENE, SILICA, CYSTINE BIS-PG-PROPYL SILANETRIOL, BIOTIN, LECITHIN, TOCOPHERYL ACETATE, CITRUS PARADISI (GRAPEFRUIT) PEEL EXTRACT, HUMULUS LUPULUS (HOPS) FLOWER EXTRACT, URTICA DIOICA (NETTLE) LEAF EXTRACT, YEAST EXTRACT/EXTRAIT DE LEVURE, ACER SACCHARUM (SUGAR MAPLE) EXTRACT, CITRUS LIMON (LEMON) PEEL EXTRACT, SACCHARUM OFFICINARUM EXTRACT, VACCINIUM MYRTILLUS LEAF EXTRACT, CITRUS AURANTIUM DULCIS (ORANGE) FRUIT EXTRACT, POTASSIUM SORBATE.