Cos De BAHA 10% Niacinamide Serum — niacinamide at 10% with zinc at 1% is a well-established combination, and Cos De BAHA delivers it without the marketing markup. Niacinamide works on tone and barrier function; zinc contributes to oil regulation, which is why this pairing keeps appearing in formulas aimed at oily skin.
The formula is light and slightly watery, absorbing in seconds.
Best for
Visible pores, midday shine, and blemish-prone skin that does not need a full acne routine.
How to use Cos De BAHA 10% Niacinamide Serum
Apply to clean skin before moisturiser. Once daily to start — 10% niacinamide causes flushing in some people — then twice daily if tolerated.
What is in 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. Background reading on niacinamide if you want the chemistry behind it.
Zinc
Zinc in a leave-on formula is there to moderate oil and calm inflammation. It is a long-standing pairing with niacinamide, because niacinamide steadies barrier function while zinc addresses the sebum and the redness that oily, blemish-prone skin brings with it. The amounts used are small and the effect is cumulative rather than immediate.
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, iUNIK Centella Calming Gel Cream and Simple Kind To Skin Soothing Facial 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
Patch test on a small area behind the ear or along the jaw before the first full application, particularly if your skin reacts easily. Introduce one new product at a time so that if something does not agree with you, you know which one it was.
Common questions
Is Cos De BAHA 10% Niacinamide 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 fresh is the stock?
We buy in small, frequent batches rather than holding large quantities, so what reaches you is well within date. Batch and expiry markings are printed on the packaging and we do not remove or cover them. If anything you receive is close to expiry, tell us and we will replace it.
Does the Dhaka climate affect it?
Heat and humidity shorten the working life of most cosmetic formulas, and actives like vitamin C and retinoids are the first to suffer. Keep the product capped, out of direct sun, and away from the hottest corner of a bathroom. A cool cupboard is better than a windowsill, and better than a fridge for most textures.
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.
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