The Ordinary's Niacinamide 10% + Zinc 1% serum changed the budget skincare landscape when it launched in 2017. It was one of the first products to prove that a well-formulated active serum could sell at drugstore prices and still perform like a prestige product, and it became a global cult favorite almost overnight. Revolution Skincare launched this serum in 2018 as part of their broader mass-market active lineup, explicitly positioned at the same price point and with a nearly identical formulation philosophy. The product has stayed in their catalog ever since and remains one of their most widely recognized items, regularly showing up in UK drugstore skincare roundups as 'the niacinamide serum you buy when the Boots is out of The Ordinary.'
The formulation is almost radically simple. Ten ingredients total: water, propanediol, niacinamide, zinc PCA, glycerin, butylene glycol, xanthan gum as a thickener, sodium benzoate and potassium sorbate as preservatives, and disodium EDTA as a chelator. That's it. No fragrance, no botanical extracts, no secondary actives competing for space, no emollient support, no antioxidants. The 10% niacinamide sits in a clean humectant base with 1% zinc PCA as the only other active, and the whole serum is structured to deliver those two ingredients into the skin without any interference. At first glance this looks like a weakness — no supporting cast, nothing fancy — but at this price point and with this formulation philosophy, minimalism is a feature. Fewer ingredients means fewer potential irritants, a more predictable interaction profile with the rest of your routine, and the full 10% niacinamide concentration isn't diluted by competing actives trying to share the label real estate.
On application the serum pours out as a thin, slightly slippery water-gel that absorbs in under a minute to a matte finish. There's no tingling, no warming, no sensation of any kind — which is exactly what a well-formulated niacinamide serum should feel like. Niacinamide works slowly and cumulatively, so don't expect dramatic results in the first week. By day three to five, oily skin users often notice a mild reduction in midday shine as the zinc PCA normalizes sebum output. By week three to four, pore appearance starts to refine visibly — particularly across the t-zone — and active blemishes heal slightly faster than baseline. By week eight the cumulative effect is clearer, and by twelve to sixteen weeks post-inflammatory hyperpigmentation from old breakouts starts fading noticeably.
Where this serum genuinely shines is in compatibility. Niacinamide is one of the few active ingredients that pairs well with essentially everything else in a skincare routine — retinoids, AHAs, BHAs, vitamin C, peptides, benzoyl peroxide — and the bare-bones formulation here means there's nothing in the serum to create layering conflicts. You can apply it before or after acid toners, in the morning alongside vitamin C, at night before retinol. It layers without pilling under moisturizer and sunscreen, and the lack of fragrance makes it a safe pick for sensitive users who can't tolerate more heavily formulated products. It's the kind of serum that quietly slots into a routine and stays there for years because it never creates problems.
Its limitations are minor and expected. The minimal formulation means there's no supporting cast to soften the experience — no emollient lipid layer, no antioxidant complex, no peptide support, no texture interest. It's a functional serum, not a sensorial one. Dropper packaging is sometimes criticized for occasionally dispensing too much serum at once, which is a real but minor issue. The zinc PCA can very slightly separate or settle in the bottle over extended storage, and a gentle shake before use handles that fine. The 30ml size is small, but Revolution does sell a 60ml 'super-sized' version at some retailers for slightly better per-ml economics if you know you like it.
The value math is exceptional. At roughly $9 for 30ml this is one of the cheapest legitimate 10% niacinamide serums on the market. A bottle lasts 2-3 months with twice-daily use, so the monthly cost is $3-5 for what may be the most universally useful active serum in skincare. Compared to premium niacinamide options from brands like Paula's Choice or SkinCeuticals, which sit at $30-55 for similar concentrations, the savings are substantial, and the core ingredient delivery is comparable. For anyone building out an affordable routine, this is one of the easiest buys on the shelf — low risk, well-documented, and compatible with everything else you might already own. It's not going to be the star of your routine, but it will quietly do useful work in the background for as long as you keep using it.
