NIOXIN Diamax Advanced Hair Thickening Serum 3.38 fl oz — Instant Strand-Boost with Caffeine & Niacinamide

Nioxin Diamax Advanced Hair Thickening Serum is a daily leave-in treatment that visibly increases individual hair strand diameter for thicker, fuller-looking hair.

Built on Nioxin's salon expertise, Diamax Advanced uses HTX technology with caffeine, niacinamide and panthenol to reinforce hair fibers and help reduce breakage from styling and daily wear. The lightweight serum is formulated to deliver immediate visual thickness while nourishing the scalp and strengthening strands when used regularly.

How quickly will I see thicker-looking hair?

Many users notice an immediate difference in the appearance of strand diameter after application, with visible thickening that can last through the day. Continued daily use helps maintain that fuller look and supports hair resilience over time.

• Instant visual boost to individual strand thickness.
• Visible effect lasts up to several hours after application.
• Best results when incorporated into a consistent daily routine.

What key ingredients deliver the benefit?

Diamax Advanced combines proven cosmetic actives—caffeine to invigorate the scalp environment, niacinamide for barrier support, and panthenol for moisture retention—alongside Nioxin’s HTX technology designed to thicken the feel of each strand. Together they target both the hair fiber and the scalp surface.

• Caffeine to energize the scalp area and support a healthy feeling.
• Niacinamide to help improve hair surface texture and appearance.
• Panthenol to add moisture and reduce the look of dryness and fragility.

How do I use this serum in my daily routine?

Apply Diamax Advanced to clean, towel-dried or dry hair focusing on roots and lengths where you want more thickness. Style as usual—this lightweight formula layers easily under styling products and does not weigh hair down.

• Use daily on clean or dry hair for best visual results.
• Dispense a small amount; distribute through roots to ends as needed.
• Follow with styling products; no rinse required.

Will this help prevent breakage and support longer hair?

While not a medical treatment, the serum is formulated to strengthen hair fibers and reduce mechanical damage from brushing and styling. Over repeated use, users commonly report reduced breakage and improved hair resilience, which can help hair appear longer and healthier.

• Strengthens strands to resist daily wear and styling stress.
• Helps protect ends and roots from breakage when used consistently.
• Complements other Nioxin products for a complete system approach.

Who is this for: Nioxin Diamax Advanced is designed for anyone seeking a non-greasy, salon-grade option to make hair look thicker and fuller—suitable for all hair types and for people concerned about breakage or wanting a stronger-looking finish. It pairs well with Nioxin cleansers and conditioners for a full thinning-hair regimen, and is ideal for daily use when you want immediate cosmetic thickening plus supportive care for hair fiber strength.

Ingredients

ALCOHOL DENAT., AQUA/WATER/EAU, NIACINAMIDE, PEG/PPG-20/23 DIMETHICONE, CAFFEINE, ACRYLATES/C10-30 ALKYL ACRYLATE CROSSPOLYMER, PARFUM/FRAGRANCE, GLYCERIN, TETRAHYDROXYPROPYL ETHYLENEDIAMINE, MENTHA PIPERITA (PEPPERMINT) OIL, MENTHA ARVENSIS LEAF OIL, MENTHOL, PEG-30 DIPOLYHYDROXYSTEARATE, BENZYL SALICYLATE, HEXYL CINNAMAL, TRIDECETH-6, ALPHA-ISOMETHYL IONONE, LINALOOL, LIMONENE, CITRONELLOL