Compare Products: The Niacinamide 15 Serum vs Niacinamide Oil Control Serum
Ingredient Analysis
COSRX The Niacinamide 15 Serum targets oily or acne-prone skin with zinc, acetyl glucosamine, and a clean, minimal preservative system. The Inkey List Niacinamide Oil Control Serum is richer, layering multiple lipids, phospholipids, and humectants for a more nourishing, barrier-repair focus. The better pick depends on whether your priority is pore and oil control or barrier support and hydration.
Zinc PCA directly targets sebum production. The Inkey List Niacinamide Oil Control Serum has no dedicated sebum-control ingredient.
Phospholipids, squalane, soybean sterols, glycolipids, and hyaluronic acid together build a strong barrier-support profile. COSRX The Niacinamide 15 Serum relies mainly on humectants.
Acetyl glucosamine and niacinamide together are a well-studied brightening duo. The Inkey List Niacinamide Oil Control Serum has niacinamide alone in this role.
COSRX The Niacinamide 15 Serum uses a simpler, preservative-light system. The Inkey List Niacinamide Oil Control Serum includes phenoxyethanol, two emulsifiers, and soy oil, raising the chance of sensitivity in reactive skin.
Multiple lipid ingredients in The Inkey List Niacinamide Oil Control Serum closely mimic the skin's own barrier composition. COSRX The Niacinamide 15 Serum is designed for lighter hydration needs.
- •Niacinamide concentration is undisclosed in both products. Efficacy varies significantly between 2% and 10%.
- •Hyaluronic acid appears late in product The Inkey List Niacinamide Oil Control Serum's list, suggesting a low concentration. Humectant benefit may be modest.
- •Soybean oil contains linoleic and oleic acids; oleic acid may worsen acne in some individuals. Exact ratio is unknown.
- •Pullulan in product COSRX The Niacinamide 15 Serum provides a temporary tightening effect, not a lasting structural benefit.
- •Acetyl glucosamine brightening evidence is promising but less robust than niacinamide alone. Most studies use both together at specific ratios.
- •Phospholipid and glycolipid concentrations in product The Inkey List Niacinamide Oil Control Serum are undisclosed. Barrier benefit depends on sufficient levels.
- •pH of both formulas is unknown. Niacinamide and actives like citric acid work best within specific pH ranges.
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
- Acne-prone skin wanting to reduce blemishes
- Enlarged pores and uneven texture
- Those sensitive to zinc who want a niacinamide serum
- Niacinamide beginners looking for a gentle entry point
Key Ingredients
Niacinamide (15%), Acetyl Glucosamine (2%), Zinc PCA (1%), Allantoin (0.1%)
Niacinamide (10%), Hyaluronic Acid (1%)
Product Composition
28% similarity (8 ingredients in common)
Only in COSRX (8)▾
Only in The Inkey List (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.
Multiple users note this formula does not ball up under other products or makeup, unlike some competing niacinamide serums.
Users with dry or combination skin report this feels more hydrating than pure niacinamide serums with zinc, likely due to the squalane, HA, and lack of zinc.
The squeeze bottle with press-down cap makes it difficult to control how much product dispenses. Some users report buildup around the opening.
Consistent feedback about reduced pore appearance within 2-4 weeks of daily use.
Which Should You Buy?
The Inkey List Niacinamide Oil Control 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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