The Ordinary Niacinamide vs. Paula’s Choice 10% Niacinamide: Which Serum is Best for Pores?
You want smaller pores. I get it. Two serums dominate the conversation: The Ordinary Niacinamide 10% + Zinc 1% ($6.50) and Paula’s Choice 10% Niacinamide Booster ($44). Both deliver the same active percentage. One costs seven times more. Which one actually shrinks pores?
I’ve tested both on combination, oily, and acne-prone skin for six weeks. Here’s the honest breakdown.
How Niacinamide Actually Shrinks Pores
Pores don’t have muscles. They can’t open and close like a door. What you see as a “large pore” is a follicle stretched out by excess sebum, dead skin, or collagen breakdown around the opening.
Niacinamide (vitamin B3) works at the cellular level. It tells your sebaceous glands to produce less oil. Less oil means less stretching. Over 8-12 weeks, the pore wall tightens back up.
Studies show 4-5% niacinamide reduces sebum production by up to 30% after 8 weeks. Both these serums use 10% — double the effective dose. That extra 5% doesn’t necessarily work faster, but it ensures enough active penetrates even if some is lost to formulation.
The real question isn’t percentage. It’s delivery. Does the formula actually get niacinamide into the skin without irritation?
The Ordinary Niacinamide 10% + Zinc 1%
Price: $6.50 for 30ml
Texture: Light gel-water. Dries slightly tacky.
Key extra ingredient: Zinc PCA (regulates oil, calms redness)
This serum works. I saw a visible reduction in mid-day shine after three weeks. Pores around my nose looked less defined by week six.
But there’s a catch. The texture is finicky. It pills under sunscreen or moisturizer if you don’t wait a full 90 seconds between layers. Some users report a temporary foaming sensation on application — that’s the zinc reacting with the pH of your skin. It’s normal but feels weird.
For oily skin types, this is a solid choice. The zinc adds extra oil control that the Paula’s Choice version lacks.
Who should NOT buy this
If you have dry or sensitive skin, skip it. The 10% concentration plus zinc can sting. I’ve had three readers report red patches after three days of use. Start slow — every other night — and buffer with a moisturizer underneath.
Paula’s Choice 10% Niacinamide Booster
Price: $44 for 20ml
Texture: Thin, watery, sinks in instantly
Key extra ingredients: Vitamin C (ascorbyl glucoside), licorice root, peptides
This isn’t a standalone serum. It’s a booster — you mix 2-3 drops into your moisturizer or another serum. That flexibility is its biggest strength.
The texture is elegant. No pilling. No tackiness. It layers under makeup without issue. The added vitamin C and licorice root target hyperpigmentation alongside pore control. If you have post-acne marks and large pores, this hits both at once.
But the pore-shrinking effect? About the same as The Ordinary. The booster format dilutes the niacinamide to roughly 3-5% when mixed, which is still effective but no stronger than the cheaper option.
Who should buy this
If your skin is sensitive or dry, the Paula’s Choice formula is gentler. The vitamin C derivative is less irritating than L-ascorbic acid. You also get peptide support for collagen — helpful if you’re over 30.
Head-to-Head Comparison: Pore Results
| Category | The Ordinary Niacinamide | Paula’s Choice Booster |
|---|---|---|
| Price per ml | $0.22 | $2.20 |
| Pore reduction (6 weeks) | Moderate — visible | Moderate — visible |
| Oil control | Strong (zinc helps) | Moderate |
| Irritation risk | Higher — stinging possible | Lower — gentler base |
| Layering ease | Can pill | Seamless |
| Extra benefits | Zinc for acne | Vitamin C + peptides |
Both reduce pores at the same rate. The difference is user experience and skin type match.
Common Mistakes That Ruin Results
I see three errors constantly.
Mistake 1: Using too much. Niacinamide is dose-dependent up to about 5%. More isn’t better. Two drops of The Ordinary, or three drops of the booster mixed into moisturizer, is enough. Slathering on a full dropper just wastes product and increases irritation.
Mistake 2: Expecting overnight results. Pores shrink over weeks, not days. If you don’t see change in two weeks, keep going. Cell turnover takes 28 days. Give it two full cycles.
Mistake 3: Layering with strong acids. Don’t use niacinamide in the same routine as a high-pH vitamin C serum (L-ascorbic acid) or strong AHAs. The pH conflict can cause flushing and reduce effectiveness. Use niacinamide in the morning, acids at night.
When Neither Serum Is the Right Choice
Niacinamide doesn’t fix every pore problem.
If your pores look like small craters or have a dimpled appearance, that’s not oil. That’s loss of collagen and elastin — often from sun damage or aging. Niacinamide helps a little, but retinoids (tretinoin, adapalene, or retinaldehyde) rebuild collagen far more effectively. Try La Roche-Posay Adapalene Gel ($30) or Geek & Gorgeous A-Game 5 Retinal ($16) instead.
If your pores are clogged with black plugs (blackheads), niacinamide won’t extract them. You need a salicylic acid cleanser or toner. Paula’s Choice 2% BHA Liquid Exfoliant ($34) is the gold standard here. Use it twice a week, then follow with a niacinamide serum to keep pores tight.
If your skin is extremely oily and you’ve tried everything, consider a prescription azelaic acid gel (15-20%) or oral spironolactone. Topical niacinamide can only do so much against hormonal oil production.
Final Verdict
For most people with oily or combination skin, The Ordinary Niacinamide 10% + Zinc 1% is the better buy. It costs $6.50, controls oil aggressively, and shrinks pores at the same rate as the expensive option.
Buy Paula’s Choice 10% Niacinamide Booster only if you have sensitive or dry skin, want extra brightening from vitamin C, or need a formula that layers flawlessly under makeup. The price premium is for elegance and gentleness, not better pore results.
Both work. Pick based on your skin’s tolerance, not the price tag.