NIOXIN Diamax Advanced Hair Thickening Serum 3.38 oz — Daily Leave-In with Caffeine & Niacinamide for Thicker, Fuller-Looking Hair

Nioxin Diamax Advanced Hair Thickening Serum is a daily leave-in treatment that visibly increases individual hair diameter for thicker, fuller-looking hair and helps protect strands from breakage.

Nioxin Diamax combines HTX technology with scalp-friendly actives such as caffeine, niacinamide and panthenol to deliver thicker-looking hair immediately and stronger hair health over time. The lightweight serum is designed to be used daily on wet or dry hair and is formulated to strengthen each strand while nourishing the scalp—making it easy to include in an existing hair routine without weighing hair down.

How quickly will I see a difference in hair thickness?

Many users notice an instant visual boost in strand thickness after application, with fuller-looking hair for hours. Continued daily use supports improved strand resilience and can make hair appear denser over time.

• Visible thickening effect lasts up to several hours per application.
• Formulation targets individual hair diameter for immediate results.
• Daily use helps protect against breakage, supporting long-term appearance.

What ingredients make Diamax effective and what do they do?

The serum pairs proven cosmetic actives with HTX delivery to support both scalp condition and strand structure. Key ingredients were selected for scalp energizing, moisture retention and strand fortification rather than cosmetic fillers.

• Caffeine: stimulates and energizes the scalp surface for a refreshed feel.
• Niacinamide: helps improve skin and scalp barrier appearance and texture.
• Panthenol (Provitamin B5): moisturizes and smooths hair cuticles for less breakage.
• HTX technology: designed to deliver these actives where they support thicker-looking strands.

How do I use Diamax in my daily routine without buildup?

Apply the lightweight serum sparingly to wet or dry hair focusing on mid-lengths to ends and any areas that need thicker appearance. It’s formulated to absorb quickly so you can style as usual without a greasy residue.

• Use daily: a few drops to palms, distribute evenly through hair.
• Concentrate on thinning-prone areas, roots to ends where needed.
• Layer with styling products—allow absorption first to avoid product piling.
• Works with all hair types and complements Nioxin cleansing systems.

Will Diamax help reduce breakage and support longer hair?

The formula is built to strengthen strands and protect against mechanical and styling stress that leads to breakage. Over time, reduced breakage can help hair appear longer and healthier because fewer strands are lost along the length.

• Strengthens the hair shaft for improved resistance to snapping.
• Protects roots and ends to preserve existing length.
• Helps maintain the appearance of fuller hair while minimizing damage from styling.

Who is this for: Nioxin Diamax Advanced Hair Thickening Serum is intended for anyone seeking immediate visible thickening and longer-term protection against breakage—ideal for thinning-looking hair, fine textures, or people who want extra strand strength without heavy conditioners. It suits all hair types and can be added to daily routines for those aiming to improve hair fullness and resilience.

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