Compare Products: The Niacinamide 15 Serum vs Glass Skin Refining Serum
Ingredient Analysis
COSRX The Niacinamide 15 Serum is a focused niacinamide plus zinc formula designed for oily, acne-prone, or uneven-tone skin. Peach & Lily Glass Skin Refining Serum is a richer hydration cocktail with multiple hyaluronic acid forms, peptides, and centella actives, designed for dry, aging, or barrier-compromised skin. The better pick depends entirely on your skin concern.
Zinc PCA directly regulates sebum. Peach & Lily Glass Skin Refining Serum has no sebum-targeting actives.
Four distinct hyaluronic acid forms plus Saccharide Isomerate and Beta-Glucan cover surface to deeper hydration layers.
Adenosine, a relaxing peptide, and centella derivatives give Peach & Lily Glass Skin Refining Serum a clear anti-aging edge. COSRX The Niacinamide 15 Serum lacks these.
Niacinamide appears higher in COSRX The Niacinamide 15 Serum's list and pairs with Acetyl Glucosamine, a complementary brightening ingredient.
Madecassoside, Asiaticoside, and Beta-Glucan make Peach & Lily Glass Skin Refining Serum stronger for reactive or compromised skin.
- •Niacinamide is higher in the list in COSRX The Niacinamide 15 Serum than Peach & Lily Glass Skin Refining Serum, suggesting a likely higher concentration, but neither product discloses exact percentages.
- •Acetyl Octapeptide-3 in product Peach & Lily Glass Skin Refining Serum appears late in the list; peptide efficacy depends on concentration and skin penetration, both unknown here.
- •Madecassoside and Asiaticoside are listed near the end of product Peach & Lily Glass Skin Refining Serum; centella actives need sufficient concentration to meaningfully calm skin.
- •All comparisons assume standard, market-typical concentration ranges. Formulation pH, delivery system, and preservative levels are undisclosed and affect real-world performance.
Analysis generated from both INCI lists using Claude. Ingredient order indicates relative concentration; exact percentages are usually undisclosed.
Who It's Designed For
- 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
- Sensitive or eczema-prone skin seeking gentle actives
- Those wanting the 'glass skin' luminous hydration look
- Users who prioritize fragrance-free, clean formulas
- People new to niacinamide who want a lower concentration
- K-beauty enthusiasts looking for a multi-benefit serum
Key Ingredients
Niacinamide (15%), Acetyl Glucosamine (2%), Zinc PCA (1%), Allantoin (0.1%)
Niacinamide, Hyaluronic Acid (multiple types), Madecassoside, Peach Extract, Peptides
Product Composition
28% similarity (8 ingredients in common)
Only in COSRX (8)▾
Only in Peach & Lily (13)▾
User Feedback Patterns
Users consistently report significant reduction in daytime oil and shine. Many describe it as the best niacinamide serum they have tried for sebum control.
Unlike some high-concentration serums, this absorbs quickly without tackiness or residue. Layers well under other products.
The 20ml size (vs. 30ml standard) is a common gripe, especially given the price point.
Users report visible pore improvement around the 3-4 week mark with consistent twice-daily use.
Users consistently report improved hydration and a plumper, more luminous appearance. Many describe the 'glass skin' effect as real.
Eczema-prone and reactive skin users frequently report no irritation. Popular first serum for those new to actives.
Lightweight gel texture absorbs quickly. Some note a slight initial tack that disappears once fully absorbed. Layers well.
Multiple users report gradual fading of acne scars and improved evenness over weeks of use.
High repurchase rate in reviews. Users describe it as a staple they consistently return to.
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