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A beauty-editor favourite at a very pleasing price

If you’re in any way intrigued by skincare, you’ve likely already got a hyaluronic acid product in your arsenal. Much less ominous than it sounds, this molecule is a heavyweight humectant, which essentially means it acts like a sponge, drawing moisture in from the surrounding environment and locking it in place within your skin. The results? Pick a good one, and you’ll notice a plumper, smoother skin surface in seconds.

Such is the suits-all appeal of this skincare star, beauty brands have lapped it up, formulating hyaluronic acid into just about anything, from ampoules to foundations. But the best way to reap the benefits of HA is with a good old serum: and there’s one in particular I've been recommending for years. Luckily for you, it’s currently very generously reduced too.

Pestle & Mortar is a bit of a niche name in the skincare industry: this independent Irish brand doesn’t boast especially hypey products, nor does it just jump on the beauty bandwagon, launching a new product every other week. What it does have, however, is a thoughtfully concise collection of really, really good products that do exactly what they promise without costing an arm and a leg. If you need convincing, consider that industry powerhouse Caroline Hirons is a huge fan.

The brand’s first big success was the Pure Hyaluronic Serum, which is simply a brilliant humectant serum that’ll quench all skin types. The texture is akin to a "puffy: water, and it sinks in straight away leaving skin feeling satisfyingly smooth, with dehydration kept at bay for the entire day. It’s fragrance-free (boring, but your skin will thank you), and supported by doses of aloe vera, cucumber and vitamin E, which all work to bolster the calming effects.

So far, so simple – but here’s what really sets this serum apart from the others. Hyaluronic acid, which is touted to hold up to 1000 times its weight in water, comes in differing molecular weights. In short, the smaller the molecular weight, the deeper the molecule will penetrate the skin barrier. A large molecule will simply sit on the surface, plumping surface lines, while a smaller one will travel deeper, locking moisture in beneath. Pestle & Mortar’s serum contains three molecular weights, meaning you get both that lovely surface smoothness and deeper, more lasting hydration. Plus, as it’s formulated with all skin types in mind (and boasts an unusually short, easy-to-read ingredients list), even the most sensitive can get on board.

If that’s enough to have you sold, head straight to Liberty, where the 30ml bottle is currently reduced by 30%. A very sensible skincare bargain.

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