Quick answer
Niacinamide and vitamin C are the two most popular serums — but they do different jobs. Here is which to choose, and whether you can use both.
Want the authentic one? Every product on TheSkinProof is invoice-verified.
Shop verified serums →These are the two serums everyone asks about. Both are excellent — but they solve different problems, so the real question isn’t “which is better,” it’s “which does *your* skin need” (and can you use both?).
Quick comparison
| Niacinamide (Vit B3) | Vitamin C | |
|---|---|---|
| Best for | Oil control, pores, redness, gradual brightening | Antioxidant defence, glow, fading dark spots |
| Strength | Gentle, suits most skin | Can be active/tingly; introduce slowly |
| Best time | AM or PM | Usually AM (antioxidant protection by day) |
| Stability | Very stable | Sensitive to light/heat/air — degrades faster |
Read the deep dives: niacinamide guide · vitamin C guide.
Which should you choose?
- Oily/acne-prone, large pores, redness, sensitive → start with niacinamide (gentle, oil-control). Pair with BHA for pores.
- Dullness, dark spots, want antioxidant + glow → choose vitamin C by day, under sunscreen.
Can you use both?
Yes. The old “they cancel out” myth is outdated — modern formulas layer fine. Easiest approach: vitamin C in the AM (with sunscreen) and niacinamide in the PM, or simply layer niacinamide after vitamin C. (See layering order; terms in the glossary.)
Buy authentic serums
Vitamin C especially must be fresh and well-stored to work. At TheSkinProof, every niacinamide and vitamin C serum is invoice-verified, batch-checked and climate-stored, with a 2× money-back guarantee. Browse authentic serums.