Anua Niacinamide 10 + TXA 4 Serum Review: Can This Korean Serum Really Fade Dark Spots?

I’ve tried countless brightening serums over the years, but when I first came across the Anua Niacinamide 10 + TXA 4 Serum, I was genuinely intrigued. The combination of 10% niacinamide and 4% tranexamic acid in one lightweight formula sounded almost too good to be true. After using it consistently for several weeks, I’m ready to give you my honest, detailed take on whether this Korean skincare gem lives up to the hype — and whether it’s worth adding to your anti-aging routine.

Let’s dive in.

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What Is the Anua Niacinamide 10 + TXA 4 Serum?

Anua is a South Korean skincare brand that has built a devoted following for its minimalist, ingredient-forward formulations. This particular serum — the Niacinamide 10 + TXA 4 Dark Spot Care Serum — is one of their bestsellers, and it’s easy to see why. It targets two of the most common skin concerns for women in their 40s and beyond: uneven skin tone and visible dark spots.

The formula is marketed as an “all-in-one daily facial serum” designed to deliver the coveted glass skin look — that dewy, luminous, poreless appearance that Korean skincare is famous for. At just 1.01 fl oz (30ml), it’s compact, travel-friendly, and surprisingly long-lasting thanks to the thin, concentrated texture.

Key Ingredients at a Glance

• Niacinamide (10%) – A clinically validated form of Vitamin B3 that visibly reduces dark spots, minimizes pore appearance, and strengthens the skin barrier.
• Tranexamic Acid (TXA) (4%) – A brightening powerhouse that works differently from niacinamide, targeting melanin production pathways for a more comprehensive approach to hyperpigmentation.
• Hyaluronic Acid – A moisture-binding humectant that draws hydration into the skin, keeping it plump and dewy throughout the day.

Together, these three ingredients create a multi-pronged approach to brighter, more even-toned, and deeply hydrated skin.

First Impressions: Packaging and Texture

When the serum arrived, I was immediately struck by how sleek and simple the packaging is. True to Anua’s aesthetic, it comes in a clean white bottle with minimal branding — no fuss, no flashy design. The dropper makes it easy to control exactly how much product you’re dispensing, which I appreciate given the potent concentration of actives.

The serum itself has an ultra-lightweight, almost water-like texture. It absorbs almost instantly into the skin without any greasiness or residue. This is particularly welcome for those of us who layer multiple serums or follow up with SPF in the morning — there’s zero pilling or interference with other products.

The scent is virtually nonexistent, which is ideal if you have sensitive skin or simply prefer fragrance-free formulas.

How I Use It: My Daily Routine

I incorporated this serum into both my morning and evening routines. Here’s how I use it:

1. Cleanser – I start with a gentle, low-pH cleanser to prep the skin.
2. Toner – A hydrating toner to balance and soften.
3. Anua Niacinamide 10 + TXA 4 Serum – I apply 3–4 drops to my fingertips and press gently into my skin, focusing on areas prone to dark spots — my cheekbones, upper lip, and forehead.
4. Moisturizer – A light cream to seal in the actives and keep skin supple.
5. SPF (morning only) – Absolutely essential when using brightening actives.

One thing worth noting: niacinamide and tranexamic acid both work best with consistent, daily use. I made sure not to skip applications, and I believe that consistency made a significant difference in my results.

My Results After Several Weeks of Use

I’ll be transparent: I went into this with realistic expectations. Dark spots and hyperpigmentation don’t disappear overnight — no serum can promise that. What I was looking for was a gradual, noticeable improvement over time. And that’s exactly what I got.

Week 1–2: Hydration and Glow

The most immediate effect I noticed was hydration. My skin felt more plump and comfortable throughout the day. The lightweight texture made it a pleasure to apply, and I noticed a subtle luminosity — that lit-from-within glow — fairly quickly. My skin felt more “alive” even before I saw changes in my dark spots.

Week 3–4: Texture and Tone

By the third week, my skin texture had visibly improved. The bumpy, slightly rough patches near my cheeks smoothed out noticeably. My pores appeared smaller (likely thanks to the niacinamide), and my overall skin tone looked more even and consistent. A couple of shallow dark spots near my temples had faded noticeably.

Week 5 and Beyond: Dark Spot Improvement

This is where things got genuinely exciting. The combination of niacinamide and tranexamic acid working in tandem really started to show. A stubborn post-breakout mark that I’d been fighting for months had faded significantly. My sun damage — those small brown patches that have accumulated over years — looked less prominent. I wouldn’t say my dark spots are completely gone, but the improvement was meaningful and visible.

Skin feels consistently hydrated, balanced, and radiant. I’ve received more compliments on my complexion during this period than I have in a long time.

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The Science Behind the Formula

Part of what makes this serum so compelling is that the ingredient choice isn’t just trendy — it’s backed by solid skincare science.

Why Niacinamide at 10%?

Niacinamide (vitamin B3) is one of the most well-researched ingredients in modern skincare. At 10%, it works to inhibit the transfer of melanin (the pigment responsible for dark spots) to skin cells. It also visibly reduces the appearance of pores, improves skin elasticity, and helps fortify the skin’s moisture barrier. For anyone dealing with age spots, sun damage, or post-inflammatory hyperpigmentation, 10% niacinamide is a clinically meaningful concentration.

Why Tranexamic Acid at 4%?

Tranexamic acid (TXA) is a relative newcomer to skincare but has quickly become one of the most exciting brightening actives available. Originally used medically to reduce bleeding, TXA has been shown in dermatological research to significantly reduce melasma and hyperpigmentation by blocking the signaling pathways that trigger melanin overproduction. Crucially, TXA works via a different mechanism than niacinamide — meaning the two actives complement each other rather than duplicate each other’s action. The result is a more comprehensive and effective brightening effect.

Hyaluronic Acid: The Hydration Anchor

Hyaluronic acid holds up to 1,000 times its weight in water, making it one of the most effective humectants available. Its inclusion here serves a dual purpose: it keeps the serum feeling lightweight and comfortable (no tackiness or heaviness), and it ensures that the actives are delivered to the skin in an environment of optimal hydration — which can enhance their efficacy.

Who Is This Serum For?

Based on my experience, this serum is an excellent fit for:

• Women in their 30s, 40s, and beyond dealing with age spots or sun damage
• Anyone struggling with post-breakout dark marks or uneven skin tone
• Those looking for a lightweight, non-greasy serum that works under makeup and SPF
• Fans of Korean skincare who appreciate minimalist, science-based formulations
• People seeking a glass skin effect without heavy products

It may not be the ideal first choice for those with extremely sensitive or reactive skin — 10% niacinamide can occasionally cause flushing in very sensitive individuals, though this is relatively rare. If you’re concerned, patch-test on the inner arm before full application.

Pros and Cons

✅ What I Love

• Lightweight texture that layers beautifully under other products
• Effective combination of niacinamide + TXA for comprehensive brightening
• Noticeably improved hydration from day one
• Fragrance-free and minimal ingredient list
• Visible improvement in skin tone and texture within weeks
• Elegant, practical dropper packaging

⚠️ A Few Considerations

• Results take consistent use over several weeks — patience is required
• The 30ml bottle will feel small if you’re using it morning and evening (though a little goes a long way)
• As with any active serum, daily SPF use is non-negotiable to protect results

How It Compares to Other Brightening Serums

I’ve used quite a few brightening serums over the years, and what sets the Anua serum apart is the synergy between niacinamide and TXA. Many serums on the market focus on one or the other. Having both at clinically meaningful concentrations — in a single, lightweight formula — feels genuinely innovative and efficient. It simplifies the routine without sacrificing efficacy.

The price point is also highly accessible compared to many Western brightening serums that deliver similar or sometimes lesser results. For the quality and concentration of actives, this serum represents excellent value.

Final Verdict: Is It Worth It?

Without hesitation — yes. The Anua Niacinamide 10 + TXA 4 Serum has earned a permanent place in my skincare routine. It delivers on its promises: my skin is brighter, more even-toned, better hydrated, and visibly smoother. The dual-active formula feels thoughtfully designed, and the lightweight texture makes it an absolute pleasure to use daily.

If you’ve been looking for a serum to address dark spots, uneven skin tone, or simply want that luminous, glass-skin glow — this is one I wholeheartedly recommend.

🌟 Anua Niacinamide 10 + TXA 4 Serum

Dark Spot Care · Hyaluronic Acid · Korean Glass Skin Serum · 1.01 fl ozCheck Price on Amazon →

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Frequently Asked Questions

Can I use this serum with retinol?

Yes — niacinamide is actually one of the most retinol-friendly actives. Many skincare experts recommend pairing the two because niacinamide helps buffer potential retinol sensitivity. If you’re using both, consider applying retinol in the evening and this serum in the morning, or alternate nights.

How long before I see results?

Most users notice improved hydration and glow within the first 1–2 weeks. Visible dark spot fading typically takes 4–8 weeks of consistent daily use. Results depend on the severity of pigmentation and consistent application with daily SPF.

Is it safe during pregnancy?

Niacinamide and hyaluronic acid are generally considered safe during pregnancy. Tranexamic acid is less studied in topical form during pregnancy, so it’s always best to consult your healthcare provider before introducing new actives.

Can oily or acne-prone skin types use this?

Absolutely. The lightweight, non-comedogenic formula is well-suited to oily and combination skin types. Niacinamide is particularly beneficial for oily skin as it helps regulate sebum production.