COSRX Niacinamide 15 vs Alpha-Arbutin 2 Serum
Should I choose COSRX The Niacinamide 15 Serum or The Alpha-Arbutin 2 Discoloration Care Serum?
Short answer
Choose The Niacinamide 15 Serum if your main concerns are excess oil, visible pores and uneven texture; it has 15% niacinamide with zinc PCA in a short formula. Choose The Alpha-Arbutin 2 Discoloration Care Serum if dark spots or post-blemish marks bother you most; it combines 2% alpha-arbutin with niacinamide and tranexamic acid. Both are sold as fragrance free.
What this means for you
Start with what you notice
Name your biggest annoyance: shine and pores, or dark marks that linger. Each serum is aimed at one of those.
The ingredient names, translated
Niacinamide is vitamin B3; it's widely used for oil, pores and uneven tone. Alpha-arbutin and tranexamic acid are ingredients used for the look of dark spots. The Alpha-Arbutin serum includes niacinamide too, so it covers some overlap, but its niacinamide percentage isn't stated.
How to decide
- Oily skin, visible pores or rough texture? The Niacinamide 15 Serum.
- Dark spots or marks left after breakouts? The Alpha-Arbutin 2 Discoloration Care Serum.
- Using both? Layer one at a time and introduce them a few weeks apart.
What to expect
Fading dark spots usually takes months and depends on daily sunscreen. A high niacinamide percentage isn't automatically better and can irritate some skin at first. We haven't tested either product.
General guidance, not a test of these products: AAD: how to fade dark spots; DermNet: postinflammatory hyperpigmentation. Each product's label source is linked on its product page.
| Product | Price | Size | Key ingredients | Skin type (brand) | Fragrance | Worth knowing | Source |
|---|---|---|---|---|---|---|---|
$20.00 at Stylevana | 20 ml | Niacinamide 15% | Brand doesn't say | Marketed as fragrance free | No flags recorded; not a safety guarantee | Brand's page Checked | |
$20.00 at Stylevana | 50 ml | Alpha-Arbutin 2% | Brand doesn't say | Marketed as fragrance free | Alcohol | Brand's page Checked |
Oil and pores vs dark spots
COSRX The Niacinamide 15 Serum has 15% niacinamide, with acetyl glucosamine, zinc PCA, trehalose and allantoin. It’s a 20 mL serum with 15 listed ingredients. COSRX positions it for the look of enlarged pores, excess oil, uneven texture and post-blemish marks.
COSRX The Alpha-Arbutin 2 Discoloration Care Serum has 2% alpha-arbutin. Niacinamide and tranexamic acid appear above it on the list, with ferulic acid, glutathione and licorice root further down. It’s a 50 mL serum with a longer, 38-ingredient formula.
Skin Realist check: two serums that both say “brightening” aren’t twins. One leans oil and pores, the other leans dark spots.
Label differences worth knowing
The Alpha-Arbutin serum lists alcohol and sodium metabisulfite; the Niacinamide serum lists neither. For a broader look, see our dark spot corrector guide and acne marks guide.
Manufacturer sources
Sources and label-check dates are recorded on the product pages.
Which is best for you?
COSRX The Niacinamide 15 Serum
Best if excess oil, visible pores or uneven texture are your main concern.
Also consider it when
- You want a short, 15-ingredient formula
COSRX The Alpha-Arbutin 2 Discoloration Care Serum
Best if dark spots or post-blemish marks are your main concern.
Also consider it when
- You want alpha-arbutin, tranexamic acid and niacinamide together
Common questions
Can I use them together?
There's no listed conflict between them. Both include niacinamide, so start one at a time and add the second once your skin is comfortable.
Which is bigger?
COSRX lists The Niacinamide 15 Serum at 20 mL and The Alpha-Arbutin 2 serum at 50 mL.
Do I need sunscreen with them?
COSRX says to follow the niacinamide serum with SPF 30 or higher in the morning. Daily sunscreen matters for any dark-spot routine.