Compare Products: The Niacinamide 15 Serum vs Niacinamide 10% + Zinc 1% Serum
Ingredient Analysis
COSRX The Niacinamide 15 Serum offers a richer support formula with acetyl glucosamine, trehalose, and allantoin alongside niacinamide and zinc PCA. The Ordinary Niacinamide 10% + Zinc 1% Serum is leaner and more penetration-focused. COSRX The Niacinamide 15 Serum suits most skin types better; The Ordinary Niacinamide 10% + Zinc 1% Serum's preservative load may irritate sensitive skin.
COSRX The Niacinamide 15 Serum adds acetyl glucosamine, allantoin, and tocopherol. The Ordinary Niacinamide 10% + Zinc 1% Serum matches only on niacinamide and zinc PCA.
The Ordinary Niacinamide 10% + Zinc 1% Serum uses phenoxyethanol, chlorphenesin, and two penetration enhancers. That combination raises sensitivity risk.
Trehalose, allantoin, and two humectant glycols give COSRX The Niacinamide 15 Serum stronger moisture support than The Ordinary Niacinamide 10% + Zinc 1% Serum.
Dimethyl Isosorbide and ethoxydiglycol in The Ordinary Niacinamide 10% + Zinc 1% Serum drive actives deeper. Useful if delivery speed is the priority.
COSRX The Niacinamide 15 Serum relies on mild ethylhexylglycerin and 1,2-hexanediol. The Ordinary Niacinamide 10% + Zinc 1% Serum uses phenoxyethanol and chlorphenesin, a stronger pairing.
- •Niacinamide concentration is undisclosed in both products. Efficacy depends heavily on whether it reaches the 2 to 5 percent threshold.
- •Zinc PCA appears early in The Ordinary Niacinamide 10% + Zinc 1% Serum's list, suggesting a higher relative concentration, but no percentage is confirmed.
- •Dimethyl Isosorbide enhances penetration of all ingredients, not just actives. This could amplify any irritants present.
- •COSRX The Niacinamide 15 Serum's acetyl glucosamine benefit depends on concentration. Below 2 percent, skin-renewal evidence is limited.
- •Chlorphenesin is generally safe at low levels but may cause contact sensitization in some individuals over time.
- •Citric Acid in COSRX The Niacinamide 15 Serum likely functions as a pH adjuster at a low level, but exact pH of neither formula is disclosed.
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
- Oily and combination skin seeking oil control
- Those who want a no-frills, high-potency niacinamide serum
- Budget-conscious skincare users
- People targeting enlarged pores and textural irregularities
- Users building ingredient-focused routines
Key Ingredients
Niacinamide (15%), Acetyl Glucosamine (2%), Zinc PCA (1%), Allantoin (0.1%)
Niacinamide (10%), Zinc PCA (1%)
Product Composition
23% similarity (5 ingredients in common)
Only in COSRX (11)▾
Only in The Ordinary (6)▾
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.
Many users with oily skin report significant oil control and fewer breakouts. High repurchase rate in this demographic.
Commonly reported issue. Users recommend applying to damp skin or mixing with a hydrating serum to improve layering.
The formula can feel sticky, especially if too much is applied. Most users adapt application technique over time.
Some users report initial breakouts. Unclear whether this is purging, sensitivity, or coincidence. Most who push through report improvement.
Almost universally praised for price-to-performance ratio. Common comment: 'can't believe this costs $6.'
Which Should You Buy?
The Ordinary Niacinamide 10% + Zinc 1% 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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