Anua Niacinamide 10% + TXA 4% Serum

Hyperpigmentation is the skincare problem that never really goes away. You treat a breakout, and two months later there's a brown spot staring back at you. You get a sunburn, and suddenly your cheeks look like a constellation of old damage. I've tried vitamin C, azelaic acid, retinoids, and various combinations of all three. Nothing has been bad, but nothing has been transformative either—until I started testing Anua's Niacinamide 10% + Tranexamic Acid 4% Serum. Two weeks isn't enough time to expect miracles, but it's enough time to see whether a product is doing anything at all.

The Ingredient Combination That Caught My Attention

Niacinamide at 10% is a solid concentration. It's high enough to deliver measurable results—reducing sebum production, strengthening the skin barrier, inhibiting melanosome transfer—but low enough to avoid the irritation that kicks in at 15% or higher for sensitive skin types. I've used The Ordinary's Niacinamide 10% + Zinc 1% for years, and it works, but the texture is sticky and it pills under certain moisturizers. Anua's formulation addresses that problem.

Tranexamic acid at 4% is the more interesting ingredient here. TXA is a synthetic amino acid derivative that inhibits plasmin, which in turn reduces melanin production triggered by UV exposure and inflammation. It's particularly effective for melasma and post-inflammatory hyperpigmentation because it targets the vascular and inflammatory pathways that drive those conditions. Most TXA serums I've seen sit at 2-3%, so 4% is a meaningful concentration. The research supporting topical TXA for hyperpigmentation is solid, though not as extensive as the evidence for hydroquinone or retinoids.

The addition of ceramides and hyaluronic acid is smart. Both niacinamide and TXA can be slightly drying or irritating for some skin types, especially during the first week of use. Ceramides reinforce the lipid barrier, and hyaluronic acid pulls moisture into the skin. This isn't just a brightening serum—it's a brightening serum that won't wreck your barrier in the process.

Texture and Application Experience

The serum has a lightweight, slightly viscous texture that falls somewhere between a gel and a lotion. It's clear with a faint yellowish tint, and it spreads easily across the skin. I used three drops for my entire face, and that was plenty. The absorption time is moderate—about 60-90 seconds before it fully sets. It doesn't leave a sticky residue, but it does leave a subtle dewy finish that looks healthy rather than greasy.

Layering was straightforward. I applied it after toner and before moisturizer in my morning routine, and it played well with everything. No pilling with my sunscreen (Isntree Hyaluronic Acid Watery Sun Gel), no pilling with my moisturizer (Illiyoon Ceramide Ato Concentrate Cream). I didn't test it under makeup during the two-week period, but based on the finish, I suspect it would work fine as a primer base for someone with normal to dry skin. Oily skin types might want to skip the moisturizer step and go straight to sunscreen.

The fragrance-free formulation is a plus. There's no scent at all—no essential oils, no masking fragrance, nothing. If you're sensitive to fragrance or you're layering this with other active serums, that matters. I've had reactions to fragranced brightening serums before, and the last thing you want is contact dermatitis on top of the hyperpigmentation you're trying to treat.

Two-Week Wear Test: What Actually Happened

Conditions tested: Office days (8 hours indoor, air-conditioned), three outdoor lunch walks (20-30 minutes each, direct sun exposure), one weekend with higher humidity and more time outdoors. Skin type: combination, with a history of post-inflammatory hyperpigmentation on the cheeks and chin from old acne.

Days 1-3: No immediate changes, obviously. The serum felt comfortable on the skin, no stinging or redness. My skin looked slightly more hydrated than usual, likely from the hyaluronic acid. I was careful to apply sunscreen consistently during this period because both niacinamide and TXA work best when you're not actively adding new sun damage to the mix.

Days 4-7: I noticed my skin looked more even-toned. Not dramatically—nothing like the "wow, your skin is glowing" reaction—but the redness around my nose and the faint brown spots on my cheeks looked slightly less pronounced. I also noticed my skin felt smoother to the touch, which I attribute to the niacinamide's effect on skin texture and the ceramides supporting barrier function.

Days 8-14: The dark spot on my left cheek—a leftover from a breakout in early spring—had faded noticeably. It wasn't gone, but it was lighter. The overall tone of my face looked more uniform. I didn't see any changes in pore size or sebum production, which some people report with niacinamide, but I wasn't expecting that at this concentration. My skin felt calmer and less reactive overall, which is the kind of thing you only notice in retrospect when you're not dealing with random flare-ups.

Pros

Cons

Who Is This For?

This serum is ideal for anyone dealing with post-inflammatory hyperpigmentation, melasma, or general uneven skin tone. It's particularly well-suited for combination, normal, or dry skin types that need brightening without barrier disruption. If you have very oily skin, the texture might feel slightly too hydrating for daytime use under sunscreen, though it would probably work fine as a nighttime treatment.

It's also a good option for people who have tried vitamin C serums and found them irritating or unstable. TXA is more stable than L-ascorbic acid and doesn't oxidize as quickly, so you don't have to worry about the serum turning brown and losing efficacy after a few weeks.

Price and Where to Buy

The Anua Niacinamide 10% + TXA 4% Serum retails for $24 USD. It's available directly from Anua's US website, as well as through Korean beauty retailers like YesStyle, Stylevana, and Olive Young Global. The bottle size isn't specified on the US site, but based on the barcode and typical Anua packaging, it's likely 30ml, which is standard for serum concentrations at this price point.

At $24, this is competitively priced. The Ordinary's Niacinamide 10% + Zinc 1% is cheaper at around $6, but it doesn't contain TXA and the texture is less refined. Goodal's Green Tangerine Vitamin C Serum is in a similar price range but uses a different active. For the specific combination of niacinamide and TXA at these concentrations, $24 is fair.

Comparison Notes

Against The Ordinary Niacinamide 10% + Zinc 1%: The Ordinary is cheaper and works well for sebum control, but the texture is sticky and it doesn't contain TXA. Anua's serum is more elegant in formulation and targets hyperpigmentation more directly.

Against Goodal Green Tangerine Vitamin C Serum: Goodal uses a vitamin C derivative that's gentler than L-ascorbic acid, but it's less stable and less effective for stubborn hyperpigmentation. Anua's TXA is more targeted for melasma and post-inflammatory marks.

Against COSRX The Niacinamide 15 Serum: COSRX uses a higher niacinamide concentration (15%), which can be more effective for some people but also more irritating. Anua's 10% is a safer bet for sensitive skin, and the addition of TXA gives it an edge for hyperpigmentation.

Final Verdict

Anua's Niacinamide 10% + TXA 4% Serum is a well-formulated, effective treatment for hyperpigmentation and uneven skin tone. The ingredient combination is research-backed, the texture is pleasant, and the price is reasonable. Two weeks of use showed visible improvement in the appearance of dark spots and overall skin tone, which is promising. I'll continue using it to see how much further the results go over 8-12 weeks.

This isn't a miracle worker—no topical serum is going to erase deep melasma or old scars completely—but it's a solid, reliable option for anyone looking to fade post-inflammatory marks and achieve a more even complexion. If you've struggled with hyperpigmentation and haven't found something that works, this is worth trying.