The Ordinary Niacinamide 10% + Zinc 1% Review: Best-Value Niacinamide Serum on Amazon

If you’re looking for a niacinamide serum on Amazon, this is very likely the one you should buy. The Ordinary Niacinamide 10% + Zinc 1% has been a top-selling skincare item for years, and it’s earned that spot the hard way — by delivering a genuine active ingredient at a genuinely effective concentration for under $8. There are more expensive niacinamide serums on the market. Some of them are excellent. Very few of them are meaningfully better than this one.

We’ve reviewed dozens of niacinamide-forward products over the last two years. This one keeps showing up in our editorial picks not because it’s fashionable, but because the numbers on the label match the formulation quality inside the bottle. Here’s what to know before you buy.

What it is

Niacinamide is vitamin B3 in a topical form. In skincare, it’s one of the most well-studied active ingredients — with peer-reviewed research supporting its use for improving the appearance of enlarged pores, uneven skin tone, and post-inflammatory marks left after acne heals. It also supports the skin barrier and helps regulate the production of sebum (the oil your skin makes on its own).

This particular product from The Ordinary combines 10% niacinamide with 1% zinc PCA — a salt of the amino acid PCA (pyrrolidone carboxylic acid) chelated with zinc. Zinc PCA has less clinical research than niacinamide, but the working theory (backed by cell studies and dermatology consensus) is that it helps calm inflammation and moderate oil production. That makes the pairing especially useful for anyone dealing with oily or combination skin.

The formulation is water-based. There’s no fragrance, no essential oils, no silicones, no alcohol, no animal-derived ingredients. The ingredient list is short by design — The Ordinary’s whole approach is to strip skincare down to a single well-formulated active without the padding of trendy botanicals or expensive marketing extras.

Who this is for

This serum is a legitimately good choice for a wide range of users:

Oily or combination skin, especially with enlarged pores. This is the classic use case. Niacinamide reduces the appearance of pores over 8-12 weeks of consistent use. Zinc PCA supports oil regulation. If your T-zone gets shiny by lunchtime, this is a reasonable place to start.

People with post-acne dark marks (PIH). Post-inflammatory hyperpigmentation — the brown spots left behind after a pimple has healed — responds well to niacinamide. Improvement is gradual (visible at 8-12 weeks; substantial at 4-6 months), but it’s real.

Sensitive skin and rosacea-prone types who want a gentle active. Niacinamide is one of the most well-tolerated active ingredients. Most sensitive users can use this without issue.

Anyone building an evidence-based routine on a budget. Under $8 for a 30ml bottle of well-formulated 10% niacinamide is a genuine value.

Who this isn’t the best pick for:

• Anyone with dry or dehydrated skin looking for a moisturizing serum. Niacinamide isn’t drying, but this water-based product doesn’t add meaningful hydration. Pair with a hyaluronic acid serum underneath (The Ordinary’s HA 2% + B5 is a compatible partner) if dryness is your primary concern.
• Anyone whose skin has previously reacted poorly to high-strength niacinamide. A small minority of users find that 10% is too much and see flushing or bumps. If that’s your experience, look for a 5% formulation instead.
• People needing a moisturizer or a sunscreen. This is a serum. It goes underneath both.

Key ingredients

Niacinamide (10%). Vitamin B3. In studies at 2-10% concentrations, it improves the appearance of enlarged pores, evens skin tone, and supports the skin barrier by encouraging the production of ceramides (the lipids that keep the barrier intact). The 10% concentration in this product is at the upper end of what’s typically formulated in leave-on products.

Zinc PCA (1%). Zinc bound to the amino acid PCA. The role in this formulation is oil regulation and anti-inflammatory support. The evidence base is thinner than for niacinamide but the pairing has held up in real-world use for years.

Pentylene glycol. A humectant that also improves the feel and stability of the formulation. Not an active in itself, but a well-chosen supporting ingredient.

Sodium hyaluronate crosspolymer, tamarind seed extract, xanthan gum. Water-binding and texture-building ingredients that give the serum its light, slightly slippery consistency.

No fragrance, no essential oils, no silicones, no alcohol. This matters if you have sensitive skin.

How it performs

We evaluated this serum through daily use across multiple staff members with different skin types over three months, and cross-referenced against long-form user reports from Reddit, MakeupAlley, and Sephora. The consistent findings:

Oil control shows up in about two weeks. T-zone shine reduces noticeably. Skin doesn’t feel dry — the serum doesn’t reduce oil by stripping the skin, it just supports the skin’s own regulatory mechanism.

Pore appearance improves at 4-8 weeks. This isn’t a dramatic effect — pores don’t literally shrink — but they look smaller because the surrounding skin texture improves and the pore openings hold less oil. Compared with more expensive niacinamide products, we see similar results in the same timeframe.

PIH fades over 8-16 weeks. For post-acne dark marks specifically, expect the shift to become visible after two months and substantial after four. Consistency matters more than concentration here — daily use produces steady improvement.

Sensitive-skin tolerance is excellent. Across the users we tested with (including one with mild rosacea and one with well-controlled eczema), none reported irritation. That’s not a promise it will work the same for you, but the pattern is consistent with the ingredient list.

Layering with other actives works fine. We tested it with vitamin C in the morning and retinol at night, and saw no incompatibility issues. This confirms what recent research suggests: the old warnings about niacinamide + vitamin C were based on flawed lab studies from the 1960s that don’t apply to modern formulations.

Pilling under sunscreen occurs occasionally. If it happens to you, wait 60-90 seconds after applying before layering, or reduce the amount you’re using.

How to use it

1. Cleanse and pat dry — apply to clean skin.

2. Optional hydrating step. If you have dry or dehydrated skin, apply a hyaluronic acid serum first (on slightly damp skin) and let it absorb for a minute.

3. Apply 3-4 drops of the niacinamide serum to your fingertips.

4. Press and spread over the face and neck. Don’t rub.

5. Wait 60-90 seconds for absorption before your next product.

6. Follow with moisturizer and, in the morning, sunscreen.

Usage frequency: once or twice daily. Both AM and PM is fine for most users. If you have very sensitive skin and haven’t used niacinamide before, start with every other day for the first week.

Best paired with

Hyaluronic acid serum (underneath). For dryness or dehydration, apply an HA serum first for hydration; the niacinamide layers on top.

Vitamin C serum (in the morning). Vitamin C amplifies the antioxidant protection of daily sunscreen and works on the same brightness/dark-spot goals as niacinamide through a different mechanism. They combine well.

Retinoid (at night). If you’re already using retinol or adapalene (see our review of Differin Gel), niacinamide is one of the best supporting actives — it helps reduce retinoid irritation and supports the skin barrier while the retinoid does its work.

Ceramide moisturizer (on top). After the serum absorbs, seal with a ceramide-containing moisturizer to reinforce the barrier. CeraVe’s PM lotion or Moisturizing Cream both work well for this.

Mineral sunscreen (in the morning). Any daily SPF 30+ finishes the routine.

Skin-type suitability

Worthy alternatives

Paula’s Choice 10% Niacinamide Booster — around $44 for the same 10% concentration in a slightly more elegant vehicle. The formulation is nicer to use (better texture, no pilling issues we’ve seen with the Ordinary). If you can afford it, it’s a small quality-of-life upgrade. But for the price difference, most people should stick with The Ordinary.

Naturium Niacinamide 12% Plus Zinc 2% — around $22 for a stronger concentration. If you know your skin tolerates niacinamide well and you want to push the strength, this is a reasonable step up.

Good Molecules Niacinamide Serum — around $12. Very similar formulation to The Ordinary at a slightly higher price. No meaningful difference in effect that we’ve observed.

Glow Recipe Watermelon Glow Niacinamide Dew Drops — around $35. A very different product — much more of a hydrating “glow” serum with niacinamide as one of many actives. If you want a multi-tasking product with a nicer sensory experience, this is worth considering. If you want maximum niacinamide effect for minimum money, stick with The Ordinary.

Bottom line

Editorial Rating: 4.5 / 5

We recommend this serum without hesitation for anyone looking to add niacinamide to their routine. It’s the best-value option on Amazon, the formulation is clean and effective, and it plays well with the rest of a modern skincare routine. The dropper is fiddly and the bottle runs out faster than you’d expect, but neither is a real problem.

If you’re comparing this to a $40-60 niacinamide serum from a premium brand, the honest answer is that the premium products aren’t meaningfully more effective — they’re just packaged and marketed better. For $6-8, The Ordinary Niacinamide 10% + Zinc 1% delivers what the label promises: a legitimate 10% niacinamide serum with a helpful zinc extra, in a well-tolerated formulation. That’s the whole game.

Give it 8-12 weeks of consistent use before evaluating. Layer it with a hyaluronic acid serum if your skin runs dry. Always follow with sunscreen in the morning. Then let it do its work.