NIOXIN Diamax Advanced Hair Thickening Serum 3.38 fl oz — Caffeine & Niacinamide for Instant Strand Thickness

NIOXIN Diamax Advanced Hair Thickening Serum is a daily leave-in treatment formulated to visibly increase individual hair strand diameter and reduce breakage for a fuller-looking mane.

Designed by a salon brand with over 25 years focused on thinning hair, this lightweight serum combines HTX technology with caffeine, niacinamide, and panthenol to support stronger-feeling hair and a nourished scalp. Use after cleansing or between styling sessions to deliver temporary thickness to each fiber while helping protect against mechanical damage and environmental stressors that can shorten hair length over time.

How quickly will I notice thicker-looking hair?

Many users see immediate visual thickening after application because the formula expands each strand for increased diameter. The effect is cosmetic and lasts through styling and for several hours, giving hair a denser appearance right away.

• Visible thickening reported for up to 8 hours after use
• Instant strand-by-strand diameter boost on application
• Works on wet or dry hair for fast styling routines

What key ingredients are in the serum and what do they do?

Diamax Advanced uses targeted actives known from skin and scalp care to support hair resilience and surface health. Caffeine energizes the scalp sensation, niacinamide helps improve scalp barrier appearance, and panthenol smooths and conditions strands for a fuller feel.

• Caffeine: invigorates the scalp and contributes to a fresh-feeling routine
• Niacinamide: supports scalp skin tone and surface health
• Panthenol (pro-vitamin B5): moisturizes and smooths hair cuticles

Will this protect my hair from breakage and help it grow longer?

The formula is designed to reduce the visible signs of breakage by strengthening the hair fiber and improving elasticity, so strands are less prone to snap from brushing and styling. Regular daily use helps maintain healthier-looking hair, which can contribute to retaining length over time compared with untreated hair.

• Strengthens fiber to resist splitting and mechanical damage
• Helps hair retain moisture for improved pliability
• Recommended as part of a daily routine for best long-term results

How should I incorporate Diamax into my hair routine?

Apply a few pumps to towel-dried or dry hair, focusing on mid-lengths and ends where breakage often appears. Style as usual—air-dry or use heat tools—and reapply on non-wash days to refresh volume and protection.

• Use daily after cleansing for consistent results
• Works with all hair types and styling methods
• Layer under styling products or use alone for lightweight density

Who is this for? NIOXIN Diamax Advanced Hair Thickening Serum suits anyone seeking visibly thicker, fuller-looking hair without heavy build-up—especially people noticing decreased strand diameter, breakage, or slower length retention. It’s compatible with color-treated hair and is useful for those who want an instant cosmetic boost plus ongoing protection when used as part of a daily routine. For scalp-first care from a brand with decades of research into thinning hair, Diamax offers a salon-grade option to support a denser-looking appearance and stronger-feeling strands.

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