COSRX Niacinamide Serum vs Beauty of Joseon Glow Serum

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

• ✓Exceptionally high propolis concentration (59.94%) delivering genuine antibacterial, anti-inflammatory, and wound-healing activity
• ✓Broad user consensus on glow, brightness, and smoother skin texture after consistent use
• ✓Betaine salicylate is a gentler BHA variant effective at a wider pH range — suitable for sensitised skin that cannot tolerate regular salicylic acid
• ✓Free from artificial fragrance, essential oils, colorants, and mineral oil — well-suited to reactive and sensitive skin types

Cons

• ✗2% niacinamide is below the 5–10% range where clinical evidence for pigmentation reduction and sebum control is strongest
• ✗Honey-viscosity texture can feel tacky on application, particularly on humid or acne-prone skin where occlusion is unwanted
• ✗Propolis poses an allergy risk for individuals sensitive to bee products or pollen — patch-test required before full-face use
• ✗Minimal evidence of meaningful hyperpigmentation correction at these active concentrations; users seeking dark spot treatment will likely need a dedicated brightening serum

Best For