Compare Products: The Niacinamide 15 Serum vs B3 Nice 10% Niacinamide Serum
Ingredient Analysis
COSRX The Niacinamide 15 Serum is a focused niacinamide and zinc serum with a clean, minimal formula designed for oily or blemish-prone skin. Sunday Riley B3 Nice 10% Niacinamide Serum layers niacinamide with a dense array of antioxidants and botanical extracts, targeting aging and inflammation. The better choice depends on your primary skin concern.
Sunday Riley B3 Nice 10% Niacinamide Serum stacks resveratrol, stabilized curcumin, green tea polyphenols, and gallic acid. COSRX The Niacinamide 15 Serum has only tocopherol as an antioxidant.
COSRX The Niacinamide 15 Serum is fragrance-free with a short ingredient list and minimal known sensitizers. Sunday Riley B3 Nice 10% Niacinamide Serum contains fragrance, two preservatives, and many botanical extracts that raise allergy risk.
Zinc PCA directly regulates sebum and has antimicrobial properties. Sunday Riley B3 Nice 10% Niacinamide Serum has no comparable sebum-targeting ingredient.
Asiaticoside, madecassoside, resveratrol, and tetrahydrodiferuloylmethane collectively target inflammation and collagen support. COSRX The Niacinamide 15 Serum does not address these pathways.
COSRX The Niacinamide 15 Serum has 15 ingredients with a clear functional purpose for each. Sunday Riley B3 Nice 10% Niacinamide Serum has 32 ingredients, making it harder to trace reactions and raising the odds of interactions.
- •Niacinamide appears higher in product Sunday Riley B3 Nice 10% Niacinamide Serum's list than COSRX The Niacinamide 15 Serum's, but exact concentrations are undisclosed for both. Efficacy comparison cannot be made on position alone.
- •The stabilized forms of curcumin and EGCG in product Sunday Riley B3 Nice 10% Niacinamide Serum are more bioavailable than raw extracts, but in-formula concentrations are unknown.
- •Resveratrol is notoriously unstable in some formulations. Without pH and packaging data, stability cannot be confirmed.
- •COSRX The Niacinamide 15 Serum's Acetyl Glucosamine concentration is undisclosed. Meaningful skin-brightening effects typically require higher concentrations.
- •Botanical extract activity in product Sunday Riley B3 Nice 10% Niacinamide Serum varies widely by extraction method, part used, and concentration. Claimed benefits may not translate at trace levels.
- •Dimethyl Isosorbide in product Sunday Riley B3 Nice 10% Niacinamide Serum acts as a penetration enhancer, which could increase delivery of actives and irritants alike.
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
- Those seeking an antioxidant-rich niacinamide treatment
- Users who want botanical anti-inflammatory ingredients alongside niacinamide
- People addressing post-acne dark spots and uneven tone
- Those who prefer prestige skincare with complex formulations
- Users comfortable with light synthetic fragrance
Key Ingredients
Niacinamide (15%), Acetyl Glucosamine (2%), Zinc PCA (1%), Allantoin (0.1%)
Niacinamide (10%), Brightenyl (Diglucosyl Gallic Acid), Trans-Resveratrol, EGCG (Green Tea), Centella Asiatica
Product Composition
11% similarity (5 ingredients in common)
Only in COSRX (11)▾
Only in Sunday Riley (29)▾
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 frequently praise the lightweight, watery texture that absorbs quickly without stickiness. Layers well under other products and makeup.
Consistent reports of improved radiance and brighter complexion with regular use, though dark spot fading varies by individual.
Oily skin users report reduced shine and less sebum production throughout the day.
Some users note the dropper packaging can cause product to dry and crust around the lid. Others have reported the product arriving discolored.
Mixed opinions on value. Some feel the botanical complex justifies the premium; others find it overpriced compared to budget niacinamide options.
Which Should You Buy?
COSRX The Niacinamide 15 Serum offers great value at a lower price point. Sunday Riley B3 Nice 10% Niacinamide Serum may be worth the premium if you want Niacinamide (10%).
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