Let me save you the suspense — after 30 days of slathering this $6 serum on my face every morning and night, my pores didn’t shrink, my oil didn’t vanish, and my acne didn’t clear up completely. But my skin texture? Way smoother. My redness? Toned down. And my wallet? Still full.
I bought The Ordinary Niacinamide 10% + Zinc 1% because every skincare subreddit swore by it. At $5.90 for 30ml, it’s practically free. Here’s what actually happened when I used it consistently for one month.
What This Serum Actually Does (And Doesn’t Do)
Niacinamide — that’s vitamin B3 — works by boosting ceramide production, calming inflammation, and regulating sebum. Zinc PCA adds antimicrobial action and helps wound healing. In theory, this combo should tighten pores, reduce breakouts, and mattify your face.
In practice, it’s not magic. Here’s the honest breakdown of my 30-day experiment.
| Day | What I Saw | What I Felt |
|---|---|---|
| Day 1-7 | No visible change. Maybe a slight glow. | Skin felt tighter after drying down. Slight tingling on broken-out spots. |
| Day 8-14 | Redness around old acne scars looked less angry. | Morning oiliness reduced by about 30%. Still shiny by 2 PM. |
| Day 15-21 | Pore size unchanged. But texture looked more even. | No new cystic acne. A few tiny whiteheads that healed fast. |
| Day 22-30 | Overall skin tone more uniform. Pores still there. | Oil control plateaued. Still needed blotting papers by midday. |
The verdict? It’s a decent maintenance serum for oily, acne-prone skin. But if you expect overnight pore disappearance or total oil elimination, you’ll be disappointed.
The Two Biggest Mistakes People Make With This Serum
I made both of these in the first week. Don’t be me.
Mistake 1: Using too much
The Ordinary’s formula is 10% niacinamide — that’s a high concentration. Most studies show 2-5% is effective. Going higher doesn’t mean faster results. It means more irritation. I used 4 drops for my whole face. That’s plenty. More than that and you’ll get sticky, pilling, and possibly red.
Mistake 2: Layering with vitamin C
Some sources say niacinamide and vitamin C cancel each other out. Current research says they don’t, but my skin disagreed. When I applied Timeless Vitamin C 20% in the morning and this serum at night, my face felt raw. Separate them by at least 12 hours if you’re sensitive.
Another failure mode? Applying on damp skin. This serum has a thick, gel-like texture. It pills like crazy if your face is wet. Wait until your toner or moisturizer is fully dry — about 60 seconds — then apply.
Alternatives That Work Better For Specific Problems
The Ordinary is a jack-of-all-trades. But if you have a specific concern, something else might beat it.
- For actual pore shrinking: Try Paula’s Choice 10% Niacinamide Booster ($42). It uses a different zinc form (zinc gluconate) that’s more bioavailable. My pores looked smaller after 2 weeks with this one.
- For oil control that lasts all day: La Roche-Posay Effaclar Mat ($35) combines niacinamide with perlite and silica. It’s a moisturizer that doubles as a mattifier. My face stayed matte until 6 PM.
- For acne scars and texture: COSRX Snail Mucin 96 Power Essence ($18). Not niacinamide, but snail mucin has glycolic acid, zinc, and copper peptides. It healed my post-acne marks faster than The Ordinary ever did.
- For sensitive skin that reacts to 10% niacinamide: Good Molecules Niacinamide Brightening Toner ($14). It’s only 3% niacinamide plus licorice root. No stinging, no redness, and still smooths texture.
When NOT to buy The Ordinary Niacinamide 10% + Zinc 1%: If you have rosacea, eczema, or very dry skin. The high niacinamide concentration can cause flushing. If you’re on prescription retinoids, this serum might over-exfoliate your skin. Stick to a lower percentage like 2-5%.
How To Use It Without Hating Your Skin
Here’s the exact routine I settled on after trial and error.
Morning:
1. Cleanse with CeraVe Hydrating Cleanser ($11)
2. Apply The Ordinary serum to dry skin — 3 drops, spread fast
3. Wait 90 seconds
4. Follow with Isntree Hyaluronic Acid Watery Sun Gel SPF50+ ($18)
Evening:
1. Double cleanse with Heimish All Clean Balm ($14) + CeraVe again
2. Apply The Ordinary serum to dry skin — 3 drops
3. Wait 90 seconds
4. Apply Illiyoon Ceramide Ato Concentrate Cream ($13)
The 90-second wait time is crucial. It prevents pilling and lets the serum absorb fully. If you’re in a rush, skip the serum that day. Better to miss a dose than to have your makeup roll off in flakes.
Final Verdict: Who Should Buy This In 2026?
This serum is still a solid choice for one specific person: someone with oily, acne-prone skin on a tight budget who wants a single-step solution for texture and redness.
It’s not for pore size reduction. It’s not for severe cystic acne. It’s not for dry or sensitive skin. And it’s not for anyone who hates a slightly sticky finish (it dries down but never fully disappears).
If you fit that profile, buy it. You’ll spend $6 and get 2-3 months of noticeable improvement in skin evenness and redness. If you don’t fit that profile, spend a bit more on a targeted alternative. Your skin will thank you.