Cos De BAHA Tranexamic Acid Serum — tranexamic acid earned its place in skincare through melasma treatment, where it works on pigmentation that resists most other topicals. Cos De BAHA pairs it with niacinamide, which addresses pigment from a different direction and improves overall tolerance.
Neither ingredient stings, which makes this one of the more comfortable options in a difficult category.
Best for
Melasma, hormonal pigmentation, and dark patches that arbutin or vitamin C have not shifted.
How to use Cos De BAHA Tranexamic Acid Serum
Apply morning and night to clean skin before moisturiser. Pigmentation work takes months — three is a fair point to assess. Daily sunscreen is non-negotiable.
What is in it
Tranexamic acid
Among brightening ingredients, tranexamic acid is the one most often recommended for melasma specifically. It targets the communication that triggers pigment production rather than bleaching what is already there, so the change is gradual and the result holds better. It pairs naturally with niacinamide, which blocks a different step in the same process. Background reading on tranexamic acid if you want the chemistry behind it.
Niacinamide
Niacinamide is a form of vitamin B3, and it is one of the few skincare actives that suits nearly everyone. It supports the skin barrier, moderates oil production, and gradually reduces the look of dark marks by slowing pigment transfer to the surface cells. Because it is not an acid and not a retinoid, it rarely stings, and it can sit alongside almost anything else in a routine. Results on tone are gradual — think eight to twelve weeks, not days.
Vitamin C
Vitamin C does two useful things at once: it interferes with the enzyme that produces pigment, and it neutralises some of the free radical damage that daylight causes. That makes it a morning ingredient — it works with sunscreen rather than replacing it. Pure L-ascorbic acid is the most studied form and also the most temperamental, oxidising when exposed to light and air. A darkening bottle is a real signal, not a cosmetic one.
What to use it with
Seal this in with a moisturiser and apply it to skin that is still damp from a toner — both steps make a measurable difference to how much of the serum stays where you put it. From the rest of our range, APLB Zinc Niacinamide Facial Cream and Acwell Licorice pH Balancing Cleansing Toner are sensible companions, and both are stocked with the same cash-on-delivery terms.
Where it fits in your routine
A serum goes on after cleansing and toning, while skin is still slightly damp, and before anything heavier. That order matters more than people expect — the thinnest, most concentrated layer needs direct contact with skin, not a film of moisturiser in the way. Give it thirty seconds to absorb, then seal it in with a cream. If you are using more than one serum, the lighter one goes first.
Before you start
Keep this away from light and heat, and close it properly. Vitamin C oxidises with exposure — if the liquid turns deep yellow or brown, it has lost most of its potency and is worth replacing.
Common questions
Is Cos De BAHA Tranexamic Acid Serum authentic?
Yes. Euros Belle stocks sealed, unopened units sourced through the brand’s own distribution, and we do not sell testers, decants or refilled packaging. Every order is checked before it leaves us, and you are welcome to inspect the seal at the door before paying.
Can I pay cash on delivery?
Cash on delivery is the only payment method we offer — there is nothing to pay in advance and no card details to enter anywhere. You pay the delivery agent when the parcel reaches you. Inside Dhaka delivery is ৳70 and takes one to two days; outside Dhaka it is ৳130 and takes three to four.
How should I store it?
Somewhere cool and out of direct sunlight, with the cap closed properly. Bangladesh’s heat and humidity shorten the life of most formulas, and a bathroom shelf directly above a hot shower is the worst place in the house for anything active.
How long before I see a difference?
Longer than most marketing suggests. Pigment and firmness respond over eight to twelve weeks of consistent use, not days, and stopping and restarting resets that clock. Hydration and comfort improve much sooner — often within the first week.
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