Compare Products: The Niacinamide 15 Serum vs SuperSolutions 20% Niacinamide Serum

COSRX

The Niacinamide 15 Serum

Mid-range15%
$25 / 20ml — $1.25/ml
The Inkey List

SuperSolutions 20% Niacinamide Serum

Budget20%
$17.99 / 30ml — $0.60/ml

Who It's Designed For

COSRX
  • Oily and acne-prone skin seeking serious oil control
  • Post-acne marks and hyperpigmentation
  • Enlarged pores and textured skin
  • Users ready to step up from 10% to higher-strength niacinamide
  • Those who prefer minimal-ingredient formulas
The Inkey List
  • Very oily skin seeking maximum oil control
  • Stubborn enlarged pores unresponsive to lower niacinamide concentrations
  • Users who have tolerated 10-15% niacinamide and want to increase strength
  • Budget-conscious users wanting clinical-strength actives
  • Those seeking exfoliating effects (20% niacinamide has mild exfoliating properties)

Key Ingredients

COSRX

Niacinamide (15%), Acetyl Glucosamine (2%), Zinc PCA (1%), Allantoin (0.1%)

The Inkey List

Niacinamide (20%), Zinc PCA (0.5%), Squalane (3%)

Product Composition

26% similarity (6 ingredients in common)

Shared Ingredients
waterniacinamidebutylene glycolzinc pcaethylhexylglycerinsodium phytate
Only in COSRX (10)
pentylene glycolacetyl glucosamine12-hexanedioltrehalosexanthan gumpullulanallantoincitric acidtocopherol
Only in The Inkey List (7)
squalanephenoxyethanolbenzyl alcoholammonium acryloyldimethyltaurate/vp copolymerpolysorbate 60dehydroacetic acidsorbitan isostearate

User Feedback Patterns

COSRX
Oil control standout

Users consistently report significant reduction in daytime oil and shine. Many describe it as the best niacinamide serum they have tried for sebum control.

Lightweight texture praised

Unlike some high-concentration serums, this absorbs quickly without tackiness or residue. Layers well under other products.

Small bottle concern

The 20ml size (vs. 30ml standard) is a common gripe, especially given the price point.

Pore improvement takes time

Users report visible pore improvement around the 3-4 week mark with consistent twice-daily use.

The Inkey List
Serious oil control

Users with very oily skin consistently report this as one of the most effective oil-control products they have tried. Many note all-day mattifying effect.

Strong but not irritating

Despite the 20% concentration, most users report no irritation. However, patch testing is frequently mentioned as important for first-time users.

Better than The Ordinary

Users who found The Ordinary's 10% niacinamide too weak or pilling-prone often prefer this. The gel texture absorbs cleanly.

Can leave white cast if overused

Some users report a white film if they apply too much. The brand addresses this: use less product and follow immediately with moisturizer.

Which Should You Buy?

The Inkey List SuperSolutions 20% Niacinamide Serum offers great value at a lower price point. COSRX The Niacinamide 15 Serum may be worth the premium if you want Niacinamide (15%).

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