We Tested 27 Niacinamide Serums in the UK — See Which One Is Best

What to Look for in Niacinamide Serums

Niacinamide concentration is the first number worth checking. The sweet spot for most skin concerns sits between 5% and 10%. Below 5% you'll see minimal visible results; above 15% you risk irritation, particularly if your skin is sensitive or reactive. The top-scoring products in our analysis cluster around 10–15%, with the highest-rated PURITO serum combining 10% niacinamide with tranexamic acid (TXA) and retinal for a layered approach to pigmentation and texture. If you're new to niacinamide, start at 5–10% and build from there.

Beyond the headline percentage, look at what else is in the formula. Niacinamide works well alongside zinc (particularly for oiliness and breakouts), hyaluronic acid (for hydration without heaviness), and tranexamic acid (for dark spots and post-acne marks). The COSRX 15% serum at £11.99 and the JUMISO 20 at £18.95 both pair niacinamide with brightening actives, which is why they score significantly higher than single-ingredient formulas at similar or higher price points.

Packaging matters more than most people expect. Niacinamide is relatively stable compared to vitamin C, but it can degrade with repeated air exposure. Serums in pump dispensers or narrow-neck droppers hold up better than wide-mouth jars. Opaque or amber glass also helps if the formula contains additional actives like retinal that are light-sensitive. None of the 32 products we analysed were third-party tested, which is worth bearing in mind — you're largely trusting the brand's stated concentrations.

Texture and base matter for layering. A water-based serum with a thin consistency will sit under moisturiser without pilling. Avoid silicone-heavy formulas if you're planning to layer multiple actives, as they can create a barrier that prevents other ingredients from absorbing properly.

Common Mistakes When Buying Niacinamide Serums

Our analysis of 32 products shows an average price of £11.99, with scores ranging from 30.0 to 81.0 out of 100. That's a massive spread, and price does not track quality reliably. Several products priced above £20 scored in the 40s and 50s, while the Revolution Skincare 10% Niacinamide + 1% Zinc Serum at £4.89 scored 80.0 — the second-highest in the entire category and the top value-for-money rating at 94.0/100. Paying more for a niacinamide serum is rarely justified unless the formula genuinely adds meaningful actives at effective concentrations.

Chasing the highest niacinamide percentage is another common error. Some buyers see 20% on a label and assume it must be more effective than 10%. In practice, concentrations above 15% are associated with higher rates of flushing and irritation, particularly in those with rosacea or sensitive skin. The efficacy gains above 10–12% are marginal for most users, and the irritation risk is not. The JUMISO 20 serum works not because it has 20% niacinamide, but because the formula pairs it with glutathione, TXA, and centella — not just a high number.

Amazon star ratings are another trap. Several products in our dataset had high customer ratings but scored in the 30s and 40s on formulation quality and ingredient transparency. Consumer reviews can't assess whether stated concentrations are accurate, whether the pH is optimised for absorption, or whether secondary ingredients are present at meaningful levels. Use ratings as a rough signal for texture and tolerability, not for formulation quality.

Finally, many buyers ignore the product's intended skin type. Of the top-performing serums in this category, most are best suited to oily, combination, acne-prone, or post-acne-mark skin. If you have dry or mature skin, you'll want a niacinamide serum that's paired with hydrating ingredients like sodium hyaluronate, not one formulated to reduce shine and tighten pores.

Types and Forms Explained

Most niacinamide serums on the UK market are water-based, and that's fine — niacinamide is water-soluble and absorbs efficiently in this format. The variation comes from what they're formulated to do alongside the niacinamide. You can broadly group them into three categories based on their secondary actives and target concerns.

Pore and oil control formulas pair niacinamide with zinc, usually zinc PCA or zinc gluconate. These are best for oily and combination skin dealing with enlarged pores, shininess, and active breakouts. The Revolution Skincare 10% Niacinamide + 1% Zinc Serum is the clearest example in this dataset — simple, effective, and very well priced at £4.89.

Brightening and pigmentation formulas layer niacinamide with tranexamic acid, kojic acid, glutathione, or vitamin C derivatives. These target post-acne marks, uneven skin tone, and sun-related discolouration. The PURITO TXA serum and the JUMISO Niacinamide 20 both fall into this group, and they score higher overall because they address a harder problem with more sophisticated formulations. Expect to pay £15–£20 for this tier.

Anti-ageing and skin barrier formulas combine niacinamide with peptides, retinol, ceramides, or hyaluronic acid. These are better suited to drier or more mature skin types, and they tend to be gentler on texture and irritation. They're less common in the sub-£15 price bracket. If anti-ageing is your primary concern, look for formulas with retinal or peptides alongside the niacinamide rather than buying a high-concentration single-active serum.

What to Expect to Pay

Across the 32 products we analysed, prices run from £4.69 to £32.45, with an average of £11.99. The good news is that genuinely effective niacinamide serums are available at every price point below £20. Above £20, you're largely paying for branding, packaging, or prestige — not better skin results.

At the budget end, under £7, Revolution Skincare's 10% Niacinamide + 1% Zinc Serum at £4.89 is the obvious pick. It scored 80.0 out of 100 and carries the highest value-for-money rating in the category at 94.0/100. For anyone starting out with niacinamide or wanting a simple maintenance serum, this is hard to argue against.

Between £8 and £14, you'll find workhorse serums with solid formulations. Cos De BAHA's Niacinamide 10% at £8.99 scored 77.0 and delivers a straightforward, well-dosed formula. The COSRX 15% at £11.99 (scored 79.0) sits in this bracket too and is worth considering if you want a higher concentration with a trusted Korean skincare brand.

At £15–£20, the PURITO TXA serum at £17.60 (81.0/100) and the JUMISO Niacinamide 20 at £18.95 (78.0/100) represent the upper tier of genuinely differentiated formulas. These are the products where paying more makes sense, because the additional actives — tranexamic acid, retinal, glutathione — are doing real work alongside the niacinamide.

Above £20, the data does not support the premium. Several products in that price range scored below the category average of 62.0. Unless a high-end serum has a specific formulation feature you can't find elsewhere, there's no evidence from this analysis that spending more than £20 improves your results.