
Tranexamic Acid 10% Serum — Reddit Reviews
by Cos De BAHA
Updated October 17, 2026
Redditors report faster dark-spot fading; studies found niacinamide's acne results uncertain.
What the community says
This is a 10% tranexamic-acid serum with 2% niacinamide, aimed at stubborn post-acne marks and uneven pigmentation. Redditors report visible fading, while studies found topical niacinamide's acne results uncertain; the sticky aloe-like finish and occasional severe irritation are real drawbacks.
What this means for you
What people love
- 10% tranexamic acid for post-acne pigmentation
- Visible fading reported within one to three months
- Layers under SPF and makeup without pilling
Watch out for
Product details
Where to buy
What the science says vs. what Reddit says
Hyperpigmentation
Some evidence
Tranexamic Acid: 9 studies tested it on its own. See all 19 studies
On Reddit: Injury scars can fade markedly: one user reports a facial scar nearly gone after three months of serum use. 25 mentions
Both ingredients for hyperpigmentation
Tranexamic Acid Some evidence
- Most studies found it helped fade dark patches, especially in melasma
- It often worked about as well as other common dark-spot treatments
- Using it with other treatments often faded patches more than the other treatment alone
- Some studies found injected tranexamic acid, microneedling, or oral use worked better than other ways of using it
- The most common side effects were stomach upset, skin irritation, and menstrual changes
Studied at 2–5%this product: 10%
Niacinamide Some evidence
4 studies tested it on its own. See all 17 studies
Acne
Some evidence
Niacinamide: 6 studies tested it on its own. See all 17 studies
Anti-Aging
Some evidence
Niacinamide: 2 studies tested it on its own. See all 8 studies
Skin Barrier
Not proven yet
Few or mixed studies. This claim isn't established.
Niacinamide: 1 study tested it on its own. See all 17 studies
Redness/Irritation
Not proven yet
Few or mixed studies. This claim isn't established.
Centella/Cica: 1 study tested it on its own. See all 2 studies
On Reddit: Aloe-like slip feels soothing on redness, acne, and eczema, and layers under SPF or makeup. 5 mentions
Research context, not treatment advice. Studies are about the ingredient, not necessarily this exact product.
Real Reddit threads — 81 mentions across 28 threads
Cos De BAHA Tranexamic Acid 10% Serum on Reddit, in one place — 28 threads from r/SkincareAddiction, r/tretinoin and 5 more, summarized.
“Cos de Baha Tranexamic Acid serum (tranexamic + niacinamide) is one of the generic options I would suggest”
Mentioned
“and can certainly be used with retinoids comfortably.”
Mentioned
“Ideally ... you would cleanse, apply the cos de baha tranexamic serum, moisturize on damp skin.”
Mentioned
“I'm trying out the cos de baha AZ20 with 20% azelaic acid.”
Mentioned
“Think it's going well so far, but I've only started introducing it two weeks ago”
Mentioned
“- cos de baha AZ15.”
Positive
“- cos de baha Az15.”
Positive
“My full routine is:”
Positive
“The serum is so soothing for my redness/acne/eczema and truly feels hydrating too, it kinda has an aloe vera like slip when applied and works well under my SPF/makeup.”
Positive
“Cos de Baha: been using this now for two weeks since I came back from my trip. It has a nice slip to it when put on damp skin, sinks in quickly without leaving tacky feel, and I have noticed that my skin texture looks smoother and pores appear smaller.”
Positive
“can you plss give reviews for cos de baha az serum”
Positive
“when their prices started climbing, I personally switched to Cos de Baha and have been very pleased with their niacinamide and TXA serums.”
Positive
“- Cos de Baha (serums),”
Positive
“For people into K- or Asian beauty, here are few brands I've personally used and liked:”
Positive
“I love the Cos de Baha Azalaic acid serum”
Positive
“comes in 5% and 10%.”
Positive
“I see immediate results in soothing redness.”
Positive





