COSRX
The Niacinamide 15 Serum
A medium holy trinity active for hyperpigmentation and acne, built around Niacinamide, with reviewed formula data, and low obvious irritation flags.
Routine step
Serums & Treatments
Category
Holy Trinity Active
When to use
Morning or night
Skin fit
Dark spots
10/10
Acne
10/10
Pores
10/10
Dehydration
4/10
Best for
Key ingredients
Niacinamide
High-dose pore tightener and spot fader
Zinc PCA
Controls oil production and reduces shine
Allantoin
Balances out the strong active with soothing
Acetyl Glucosamine
Keeps skin hydrated at high active doses
Cautions
No major red flags in Koracle's current read. Still patch-test first.
Formula checked
Koracle has a reviewed ingredient source for this product.
Checked 2026-05-01
Available
Check current price before you buy.
Koracle is skincare education, not medical or dermatology advice. Patch-test new products. Ask a licensed dermatologist about acne, rosacea, eczema, allergic reactions, pregnancy concerns, or symptoms that persist.