‘I’m mid-40s and people think I’m in my late 20s’ with £16 Korean serum on Amazon

Amazon Prime Day has kicked off with some epic K-beauty deals, including a newly-launched anti-ageing serum that shoppers say is a ‘holy grail’

A serum that combines three of the beauty industry’s biggest buzzwords for 2026 has been reduced in the Amazon Prime Day sale. The haruharu wonder Rose PDRN Firming Serum with Retinal is usually £19, but has been reduced to £15.96 for a limited time.

K-beauty has been skyrocketing in popularity, partly thanks to social media but also because their formulas often star restorative, hydrating ingredients that actually work. Some of the main ingredients that have been trending this year include rejuvenating PDRN and anti-ageing Retinal – and this Korean product wraps them all neatly in one discounted serum.

The haruharu wonder Rose PDRN Firming Serum with Retinal is a relatively new launch, having hit shelves in January 2026. So while a 16% discount might not sound huge at first, it’s rather rare to see any beauty product discounted so soon after release, making it the perfect time to try it out.

PDRN is an ingredient usually associated with injectable treatments in aesthetic clinics, often derived from salmon sperm, but haruharu wonder uses a vegan alternative. The serum is powered by vegan Rose PDRN, which helps refresh dull-looking skin, smooth uneven texture, and support a naturally radiant complexion.

Then there’s retinal, which many skincare experts consider the next step up from traditional retinol. The serum stars 0.1% retinal, which can refine rough patches, soften visible lines, and promote a smoother, glowing look without overwhelming sensitive skin.

Clinically shown to improve firmness, smoothness, and radiance, it also uses haruharu wonder’s patented Phyto-Velvet Network for a weightless, non-sticky finish . While a 5-peptide complex targets helps improve elasticity, boost skin smoothness, and enhance overall tone so the skin feels plumper, bouncier, and more supported.

Designed for evening use due to the inclusion of retinal, the serum has earned a 4.5 star rating from Amazon shoppers who have tried it over the last six months. One, who found their previous skincare products were irritating their skin, said they’ bought this and used it every night for 2-3 weeks’ and added: “My face is back to being nice and plump – no breakouts either. I was always super satisfied with Korean skincare and this one didn’t disappoint.”

Another who said they’d ‘tried multiple retinol products’ and ‘hated every’ one of them thought they’d ‘swore off retinol/retinal for good’ – until they tried haruharu wonder’s. They said: “I decided to give haruharu wonder rose PDRN firming serum a shot. I am so glad I did. This PDRN retinal combo hits all the marks for me.

“This stuff is so gentle, light, and feels like a dream when applied. Soaks in immediately, no pilling, no stained pillow cases, no greasy feeling, just a nice satin finish. I use it nearly every night and there has not been a single flake or dry patch just clear even glowing skin. In case you couldn’t tell I am in love and this will be my ultimate holy grail beautiful skin bestie.”

While the above user didn’t suffer pillowcase staining, other customers have mentioned that using this product left yellow marks on their bedding. This is because retinal is naturally golden in colour, and as it should be applied before bed, it can left pesky marks, which some may not appreciate.

Another five-star review read: “It goes on so nicely and feels more gentle than normal retinol. I wake up with glowing skin. I’m in my mid-40s and people often think I’m in my late 20s-early 30s when they meet me and are shocked when they find out my real age. I use this on all the days I’m not using a stronger retinol 3x/week.”

Of course, no skincare product is guaranteed to work for everyone. While retinal is generally considered more effective than retinol, some users may still experience sensitivity, particularly if they’re new to vitamin A products. Still, for under £16, it feels like a good opportunity to try multiple skincare trends in one formula without spending premium serum prices.

At LookFantastic, the INNISFREE Retinol Green Tea PDRN Firming Serum 25ml is reduced to £24.80 from £31. It’s a smaller sized bottle and uses retinol instead of retinal, but is still said to be a potent formula designed to visibly refine and smooth the complexion.

Meanwhile, Medik8 has recently thrown their hat into the PDRN ring with their Exo-PDRN Prismatic+. Costing £79, it uses Prismatic PDRN, which according to the brand is a ‘pioneering form of vegan PDRN with a stable tetrahedral structure for 100% better skin absorption than traditional PDRN’. This particular option doesn’t include retinal, but could be paired with the brand’s Crystal Retinal, often considered a gold standard product by experts.

Back at Amazon, haruharu wonder also has a range of other skincare products on offer. For daytime skincare, I’m quite the fan of their Black Rice Moisture Airyfit Daily Sunscreen SPF50+/PA++++ , which has dropped from £17 to £14.22 during Prime Day.

Korean sunscreens have developed a cult following for their lightweight textures and invisible finish, and this formula is no exception. It combines broad-spectrum SPF protection with antioxidant-rich black rice, ceramides, niacinamide and adenosine for a hydrating yet protective finish.

Another product that’s featured in my skincare routine in the past is the haruharu wonder Black Rice Bakuchiol Eye Cream , now £12.26 down from £13.27. Powered by bakuchiol, a natural retinol alternative, this cream targets fine lines and wrinkles around the eyes with visible firming results.

Shoppers can explore the haruharu wonder deals and build their personalised skincare routine on Amazon here.