COSRX Niacinamide Serum vs The INKEY List Niacinamide

Pros

• ✓High 15% niacinamide concentration delivers measurable results for pores, sebum control, and hyperpigmentation — consistently reported by reviewers across skin types
• ✓Lightweight, fast-absorbing texture with no sticky residue; universally praised application experience
• ✓Zinc PCA synergises with niacinamide for enhanced oil regulation — a well-documented combination for acne-prone and oily skin
• ✓Clean, minimal formula: fragrance-free, paraben-free, sulfate-free, with soothing panthenol and allantoin to buffer irritation potential

Cons

• ✗20ml bottle is unusually small — with twice-daily use it lasts roughly 6–8 weeks, making cost-per-ml high relative to comparable serums
• ✗Initial stinging or tingling is frequently reported in the first 1–2 weeks; at 15% this is expected but rules out very reactive or compromised skin barriers
• ✗Daily use without moisturiser can cause mild tightness or dryness, particularly in drier climates or for those not layering hydration on top
• ✗A small number of users report itching or irritation that did not resolve — likely due to barrier sensitivity rather than a formulation defect, but indicates the concentration is not universally tolerated

Best For

Pros

• ✓10% niacinamide is a clinically validated concentration for sebum regulation, pore appearance, and mild brightening
• ✓Fragrance-free and well tolerated — no irritation reported even in sensitive or reactive skin users
• ✓Lightweight, fast-absorbing formula layers easily under moisturiser and makeup
• ✓1% hyaluronic acid (sodium hyaluronate) supports hydration without greasiness

Cons

• ✗Carbomer-heavy gel base can leave a white cast and pilling sensation if more than a pea-sized amount is used
• ✗Mild tackiness noted immediately post-application, especially with heavier-handed application
• ✗Tube packaging makes precise dosing difficult and can dispense excess product
• ✗Photosensitivity anecdotally reported by one reviewer when used in the morning — general sun protection advice applies

Best For