Can a viral K-beauty serum really transform mature skin? A 48-year-old tests the Anua brightening serum against dull skin and age spots

If your go-to skincare routine isn't delivering the same radiance it once did, you're not imagining things. As skin matures in our 40s and beyond, natural moisture levels drop, and cell turnover slows. This often leads to dullness, enlarged pores, and stubborn sun spots – particularly along the cheekbones.

So, when a product promises to address these specific concerns all at once without causing irritation, our beauty team takes note. That is exactly what drew us to Anua’s Niacinamide 10% + TXA 4% Serum, which is currently being hailed as one of the best Korean beauty products on the market. Dubbed the ‘pink elixir’ by fans, this viral K-beauty blend is formulated to revive dull, dry complexions and fast-track that coveted, luminous "glass skin" look.

Naturally, we had to see if the hype held up on mature skin. We asked Jenny Church, a 48-year-old member of our Tester Network, to switch it into her daily routine. While true pigment correction takes a few weeks of consistent use, Jenny noticed a dramatic shift in her skin’s hydration and texture in just seven days.

Here is her honest review.

Anua Niacinamide 10 + TXA 4: At a glance

First impressions

The joy of using a luxury skincare product can quickly be ruined by disappointing packaging. It’s not just about aesthetics, either – a leaky bottle or an inefficient design can turn a fabulous formula into a total chore to use.

Fortunately, Anua avoids these pitfalls entirely. This was Jenny’s very first time trying the brand, and the premium presentation impressed her straight away.

"First impressions: lovely packaging and a really good quality bottle topper," she noted.

The sturdy pipette applicator allows for precise dispensing, ensuring you get the exact amount of product needed without any wasteful mess.

"One week on, and there is absolutely no leaking or seeping from the dropper, which is brilliant."

The 7-day test

Jenny integrated the serum into her routine twice a day, applying it morning and night. Having volunteered to test the product specifically to address recent age spots and a generally dull, uneven complexion, she was delighted by the instant comfort it provided.

"I tried it after removing my makeup the first night and immediately felt like my skin needed it," she said. "My skin just drank it up!"

For mature skin types naturally prone to moisture loss, rapid absorption is key. Thanks to the moisture-boosting duo of hyaluronic and polyglutamic acids, the serum leaves the complexion feeling instantly refreshed and cushiony – creating a smooth canvas for your morning makeup or evening creams.

The results

Hyperpigmentation is famously stubborn; skincare experts agree that fading dark spots typically takes four to six weeks of dedicated use. However, after just seven days, Jenny was already impressed by the visible shift in her skin's overall vitality and texture.

"I am 48 and have developed a lot of age spots in recent years, particularly around my cheekbone areas, and my skin has been looking a bit dull and uneven," she noted. "Although it’s too soon to tell the impact on the age spots, I have definitely noticed an overall improvement in my skin’s texture and plumpness."

The verdict

If you're looking to explore the benefits of K-beauty with a non-irritating daily serum that restores bounce, imparts a beautiful glow, and steadily works to unify skin tone, the Anua Niacinamide 10% + TXA 4% Serum is well worth a spot in your shopping basket.

The ultimate proof lies in its long-term consistency, but it has already earned a permanent place in Jenny’s bathroom cabinet.

"I will definitely keep using it and would recommend it for anyone looking to brighten, tighten, and improve skin texture," she added.

Key ingredient benefits

What makes the formulation inside this little pink bottle particularly brilliant for women over 40 is its targeted, dual-action approach. Rather than relying on a single ingredient, it combines a powerhouse mix of dermatologist-approved active brighteners with comforting hydrators that actively support the skin barrier.

• 10% Niacinamide: Also known as Vitamin B3, this multitasking saviour visibly brightens the complexion while refining the appearance of enlarged pores.
• 4% Tranexamic Acid (TXA): A heavyweight ingredient celebrated for evening out deep-set discolouration and stubborn sun damage.
• 2% Arbutin: A plant-derived antioxidant that illuminates the skin and unifies tone.
• Hyaluronic Acid: A heavy-lifting humectant that draws moisture deep into the skin for long-lasting hydration.
• Polyglutamic Acid: A powerful moisture-retaining peptide that encourages a bouncy, plumped skin barrier effect.

How to use the Anua serum

To get the best results, slot the serum into your daily ritual like this:

• When to Use: ☼ AM and ☽ PM.
• Order: Apply immediately after cleansing to clean, dry skin.
• Application: Dispense a few drops using the controlled pipette and gently pat into the face.
• Next Steps: Follow with your favourite moisturiser, and always finish with a high SPF in the morning to protect your skin and prevent future dark spots.