The Ordinary Niacinamide vs. Paula’s Choice 10% Niacinamide: Which Serum is Best for Pores?
You have enlarged pores. You want them smaller. Two serums dominate the conversation: The Ordinary Niacinamide 10% + Zinc 1% and Paula’s Choice 10% Niacinamide Booster. Both contain the same active ingredient at the same concentration. So why do some people swear by one and hate the other?
Here is the short answer: The Ordinary Niacinamide 10% + Zinc 1% is the better choice for oily, non-reactive skin on a budget. Paula’s Choice 10% Niacinamide Booster wins for sensitive, dry, or acne-prone skin that cannot tolerate high-zinc formulations. But the full answer requires looking at texture, supporting ingredients, and how each serum behaves on different skin types.
Ingredient Profiles: What Each Bottle Actually Contains
Both serums list niacinamide at 10% as the active. That is where the similarity ends.
| Ingredient | The Ordinary Niacinamide 10% + Zinc 1% | Paula’s Choice 10% Niacinamide Booster |
|---|---|---|
| Niacinamide concentration | 10% | 10% |
| Zinc form | Zinc PCA (1%) | None |
| Key supporting ingredients | None | Vitamin C (ascorbyl glucoside), licorice root extract, peptides, hyaluronic acid |
| Base | Water, propanediol, thickeners | Water, glycerin, silicones (dimethicone, cyclopentasiloxane) |
| Preservative system | Phenoxyethanol, chlorphenesin | Phenoxyethanol, caprylyl glycol |
| Fragrance | None | None |
The Ordinary formula is stripped down. Niacinamide, zinc PCA, thickeners, preservatives. That is it. The zinc is there to regulate sebum and calm inflammation. But for some people, zinc PCA at 1% causes stinging, dryness, or peeling — especially when layered with other actives.
Paula’s Choice formula is a cocktail. Alongside niacinamide, it contains a vitamin C derivative (ascorbyl glucoside), licorice root extract for brightening, peptides for collagen support, and hyaluronic acid for hydration. The base uses silicones, which gives it a silky, blurring texture that physically fills pores on contact.
Key difference: The Ordinary targets oil control. Paula’s Choice targets overall skin texture and brightness, with pore-minimizing as a secondary benefit.
Texture and Application: The Silicone Factor
This is where most people make their choice. Texture determines compliance. If you hate how a serum feels, you stop using it.
The Ordinary Niacinamide 10% + Zinc 1% has a watery-gel consistency. It dries down to a slightly tacky finish. On oily skin, this is fine — it acts as a mattifying layer under moisturizer. On dry or dehydrated skin, the tackiness can feel tight and uncomfortable. Users frequently report pilling when layering it under sunscreen or makeup.
Paula’s Choice 10% Niacinamide Booster has a silicone-rich, almost primer-like texture. It spreads easily, dries to a velvety-smooth finish, and creates a barrier that blurs pores instantly. This is not just cosmetic — the silicones (dimethicone and cyclopentasiloxane) sit on top of the skin and reflect light, making pores appear smaller within seconds.
The tradeoff: silicones can trap dead skin cells and bacteria for people prone to closed comedones or fungal acne. If you break out from dimethicone-heavy products, the Paula’s Choice booster could cause congestion after 2-3 weeks of daily use.
How to test which texture works for you
Buy the smallest size available. Apply each to one side of your face for 5 days. Look for three signs: stinging (The Ordinary), pilling (The Ordinary), and new small bumps (Paula’s Choice).
Irritation and Sensitivity: The Zinc Problem
Zinc PCA at 1% is the most common irritant in The Ordinary formula. It is not the niacinamide. Many people blame niacinamide for flushing or stinging, but clinical studies show that pure niacinamide at 10% has a low irritation profile — it is the zinc or the high pH of some formulations that causes the reaction.
A 2019 study in the Journal of Cosmetic Dermatology tested 10% niacinamide on 50 participants with rosacea. 94% tolerated it well. The 6% who reacted had compromised barrier function. That is relevant: if your skin barrier is damaged (from over-exfoliation, retinoids, or harsh cleansers), The Ordinary serum will sting. Paula’s Choice booster, with its silicone barrier and added glycerin, is less likely to penetrate and irritate damaged skin.
Who should avoid The Ordinary serum:
- Anyone using prescription retinoids (tretinoin, adapalene)
- Anyone with diagnosed rosacea or eczema
- Anyone who has experienced stinging from other zinc-based products
Who should avoid Paula’s Choice Booster:
- Anyone with fungal acne (Malassezia) — silicones feed the yeast
- Anyone who breaks out from dimethicone or silicone-heavy primers
- Anyone who prefers water-based, minimalist routines
Cost Per Drop and Real-World Results Timeline
Price matters, but cost per drop matters more. You are not comparing $10 to $40. You are comparing how long each bottle lasts and how much you need per application.
The Ordinary Niacinamide 10% + Zinc 1%: $6.50 for 30ml. 3-4 drops per application. One bottle lasts roughly 3 months with daily use. That is $2.17 per month.
Paula’s Choice 10% Niacinamide Booster: $42.00 for 20ml. 2-3 drops per application because it spreads further due to the silicone base. One bottle lasts roughly 2 months with daily use. That is $21.00 per month.
Price difference: The Ordinary is 10x cheaper per month.
But results timelines differ. The Ordinary serum typically shows visible pore reduction (not closure — pores do not close) after 8-12 weeks of consistent use. The zinc is doing the heavy lifting by regulating sebum production at the gland level. Paula’s Choice booster shows visible pore blurring immediately due to silicones, but the actual structural improvement from niacinamide takes the same 8-12 weeks.
If you want immediate cosmetic results, Paula’s Choice wins. If you want long-term sebum regulation at a fraction of the cost, The Ordinary wins.
When Neither Serum Is the Right Choice
This is the section most comparison articles skip. Here is the truth: for some people, neither of these serums will meaningfully reduce pore size.
Pore size is largely genetic. Topical niacinamide can reduce the appearance of pores by 15-25% in clinical studies — that is real, but it is not a transformation. If your pores are large due to thick, clogged skin (not just oil), a chemical exfoliant like Paula’s Choice Skin Perfecting 2% BHA Liquid Exfoliant will do more for pore appearance than either niacinamide serum. BHA (salicylic acid) dissolves the debris inside the pore wall, allowing the pore to contract.
If your pores are stretched from years of picking or cystic acne, no topical will fix that. Microneedling or laser treatments performed by a dermatologist are the only options. Niacinamide serums will be a waste of money in that scenario.
Common mistake: using a niacinamide serum while over-exfoliating. If you are using a BHA toner, a retinol, and a niacinamide serum in the same routine, your barrier will break down. The pores will look larger because the skin around them is inflamed and dehydrated. Cut back to three products — cleanser, moisturizer, one active — for two weeks. See if pores shrink on their own.
Final verdict: The Ordinary Niacinamide 10% + Zinc 1% is the best serum for pores if you have oily, resilient skin and want to spend under $10. Paula’s Choice 10% Niacinamide Booster is the best serum for pores if you have sensitive, dry, or combination skin and want immediate cosmetic blurring. Neither will close your pores permanently. But used correctly, both can make them less noticeable over 8-12 weeks.