Niacinamide — a form of vitamin B3 — is the quiet workhorse of skincare. It's tolerated by most skin, it plays nicely with almost everything else in a routine, and it's backed by reasonable evidence. It's also genuinely cheap, which makes the premium-priced versions hard to justify. If you want one low-risk addition to a routine, this is a sensible candidate.
What it actually does
The evidence points to a few real, if modest, benefits: it supports the skin's barrier, can help regulate oil, and may reduce the look of redness and uneven tone with consistent use. It's not a miracle ingredient — but it's a dependable all-rounder, and "dependable" is underrated.
The strength that works
Around 4–5% is the commonly used, effective range, and it's what most well-formulated products contain. Very high concentrations (10% and up) don't reliably do more, and they're more likely to irritate some people. This is a clear case where a bigger number on the bottle isn't a better product.
It plays well with others
Including vitamin C. The old "niacinamide and vitamin C cancel each other out" claim came from decades-old laboratory conditions, not normal use — in practice, plenty of products combine them happily. You can use niacinamide morning or night, and layer it under a moisturiser without fuss.
A £6 niacinamide and a £30 one are usually doing the very same job.
Why you shouldn't overpay
Niacinamide is stable and inexpensive, and it turns up across budget ranges. Once a product is in that sensible 4–5% range and pleasant to use, paying more rarely buys you more. Save the difference for the steps that do the heavy lifting — sunscreen, and an active like retinol if you want one.
A 4–5% niacinamide, standalone or built into a moisturiser
Low cost, low risk, no need for premium. If your skin is sensitive, patch-test and start every other day before building up. And don't feel you must buy a dedicated serum — a moisturiser that already contains it is the simplest route.
FAQ
Serum or moisturiser?
Either works. A moisturiser that already includes niacinamide keeps your routine short; a standalone serum gives you more control over the strength.
Will it clear up acne?
It may help with oiliness and the look of redness, but it isn't a standalone acne treatment. For persistent acne, see a pharmacist or GP.
Can niacinamide irritate?
For most people it's very well tolerated. If you react, it's usually the high-percentage products — drop to around 4–5%.