Compare Products: The Niacinamide 15 Serum vs Clinical Niacinamide 20% Treatment
Ingredient Analysis
Paula's Choice Clinical Niacinamide 20% Treatment is the more active-rich formula, adding vitamin C, multiple plant antioxidants, panthenol, and glycerin. COSRX The Niacinamide 15 Serum is simpler and includes zinc PCA for sebum control and tocopherol for antioxidant support. Choose based on your skin goals.
Paula's Choice Clinical Niacinamide 20% Treatment adds vitamin C, multiple plant antioxidants, and panthenol. COSRX The Niacinamide 15 Serum covers fewer active categories.
COSRX The Niacinamide 15 Serum includes zinc PCA, a well-established sebum regulator. Paula's Choice Clinical Niacinamide 20% Treatment does not.
Paula's Choice Clinical Niacinamide 20% Treatment layers ascorbyl glucoside, licorice extract, and niacinamide for broader brightening coverage.
Paula's Choice Clinical Niacinamide 20% Treatment adds glycerin and panthenol alongside pentylene glycol. COSRX The Niacinamide 15 Serum relies on fewer humectants.
COSRX The Niacinamide 15 Serum has a shorter formula with no phenoxyethanol. It may suit sensitive skin better.
- •Niacinamide concentration is undisclosed in both products. Efficacy depends heavily on percentage used.
- •Ascorbyl glucoside stability varies by formulation pH. Paula's Choice Clinical Niacinamide 20% Treatment's vitamin C benefit is not guaranteed.
- •Plant extract concentrations are unknown in Paula's Choice Clinical Niacinamide 20% Treatment. Antioxidant benefit may be cosmetic rather than therapeutic.
- •Zinc PCA position in COSRX The Niacinamide 15 Serum's list suggests a low concentration. Sebum-control effect may be modest.
- •Epigallocatechin gallate is prone to oxidation. Its real-world stability in Paula's Choice Clinical Niacinamide 20% Treatment is unclear.
- •Both lists omit pH values. Actives like ascorbyl glucoside and acetyl glucosamine are pH-sensitive.
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
- Stubborn enlarged or sagging pores that haven't responded to 10% niacinamide
- Orange-peel texture and rough, bumpy skin
- Sebaceous hyperplasia
- Advanced pore concerns related to aging or sun damage
- Post-acne marks and uneven texture
Key Ingredients
Niacinamide (15%), Acetyl Glucosamine (2%), Zinc PCA (1%), Allantoin (0.1%)
Niacinamide (20%), Ascorbyl Glucoside (Vitamin C), Meadowsweet Extract
Product Composition
33% similarity (10 ingredients in common)
Only in COSRX (6)▾
Only in Paula's Choice (14)▾
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 who found the 10% booster insufficient often report better results with this formula, particularly for aging-related pore concerns and textural issues.
The gel texture feels slightly oily to some users before it dries down. Some report a tacky feel or that it takes time to absorb. Most find it works well under moisturizer.
Some users report sensitivity, flushing, or irritation — especially if used daily from the start. Several reviewers recommend using every other day initially or finding 10% sufficient.
Like the 10% booster, results are typically seen over weeks of consistent use rather than immediately. Some users report noticeable improvement within 1-2 weeks; others need longer.
View Full Product Details
Comparing something else?
Paste any two ingredient lists, or photograph the labels, and get the same side-by-side breakdown for products we do not carry.
Open the comparison tool