K-SECRET SEOUL 1988 GLOW SERUM : NIACINAMIDE 15% + YUJA 30ml
A 30ml brightening serum for uneven tone and dullness, built around a well established tone ingredient and a citrus extract.
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- Suited to
- Normal skinCombination skinOily skin
- Helps with
- Uneven skin toneSkin that looks dullThe look of dark marks
In stock. Ships from our California warehouse, dispatched within 2 business days
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- Duties prepaid
- 30-day returns
- Free US shipping on orders of $100 or more
- Dispatched within 2 business days
How it works
This is a thin serum rather than a cream, which is the right shape for tone work: a flat even layer over the whole face is what produces an even result. It goes between the toner and the cream, morning and night, because tone is built by consistency rather than by intensity in any one sitting. The finish is light enough to sit under sunscreen, which matters more here than for most steps, since tone work without that last layer is undone faster than it is built. That is the difference from a strong overnight tone treatment, which does more per use but has to be rationed to a few nights. What you can judge is whether the overall colour reads more even in the same light after a month.
Key benefits
- What it is: a 30ml serum from K-Secret, for the serum step.
- On the ingredient list: Niacinamide, Butylene Glycol, Glycerin, confirmed on this product's own manufacturer list rather than assumed from the category.
- Fits into the routine: delivers a targeted dose of its lead ingredients to the areas that need it most.
- Original Korean Formula: the version sold on Korean shelves, not a US reformulation.
Key actives
Niacinamide
The ingredient the product is named around, sitting high on this list, and the reason it is sold for tone rather than hydration alone.
Glutathione
Present on this list, one of the better established tone ingredients in Korean formulas and a sensible companion to the first.
Beta-Glucan
A humectant with a soft cushioned feel, which is what lets a thin tone serum leave the surface looking full rather than only wet.
Squalane
A light emollient on this list that keeps a twice daily serum from reading as drying on skin that is already dull.
Ubiquinone
An antioxidant on this list, an addition beyond the tone claim itself and a common partner to it in Korean formulas.
What is this serum for?
Uneven tone and dullness, worked on together in a twice daily step rather than an occasional strong one. It is a thin serum over the whole face. You judge it on whether your overall colour reads more even in the same light after about a month of steady use.
Where does it go in my routine?
After cleansing and toning, before moisturizer, morning and night. It lands on damp skin and the cream seals it in. In the morning sunscreen is the last layer, and with any tone product that layer matters more than the rest of the routine combined.
Will it pill under sunscreen?
Rarely, since it is thin, and when it does the cause is usually too much product or not enough settling time. Use a small amount, wait thirty seconds, then the cream, then sunscreen. If it still balls up, cut the dose rather than dropping a layer.
Can I use it with an exfoliating step?
Yes, if you stagger them. Keep this twice daily and give any exfoliating product its own separate evening, so you are not stacking two demanding steps in one sitting. If the skin starts feeling tight, drop this back to once a day for a week.
Is this the Korean-market formula?
Yes. This is the Original Korean Formula 30ml bottle, the same one sold on Korean shelves.
- Ships from
- California
Duties are prepaid. Nothing is owed at delivery. Returns are accepted for 30 days, by mail.
Orders ship from our California warehouse, dispatched within 2 business days, and arrive in 3 to 5 days. Shipping is free on orders of $100 or more.
We split shipments free, so one out-of-stock item never holds up the rest of your order.
Where this unit came from
- 1Seoul
Bought as Korean-market stock - 2Customs
Duty paid by us before it enters the US - 3California
Ships domestically, no international leg
We stock the version of a formula that is sold in Korea, not the release a brand prepares for another market under the same name.
Every unit keeps its original barcode and batch code intact, so the unit in your hands can be checked against the brand’s own records.
Import duties are paid by us before the parcel reaches you, so nothing is owed at the door, and returns run for 30 days.
Every claim on this page traces to the unit in the box, the barcode, the batch code and the price you can read for yourself.
Payment and security
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How to use
- Apply after the toner while the skin is still damp so a thin layer covers the face in one pass.
- Press it over the whole face rather than only the darker patches, since even tone needs full coverage.
- Follow with a cream to hold it in place, and with sunscreen as the final morning step.
- Do not skip the morning sunscreen, since tone work without that last layer is undone faster than it is built.
Worth knowing
- Wear sunscreen every morning alongside it, because a tone routine assumes that layer is going on.
- Build up from every other morning if your skin reacts easily to new leave-on products.
Reviews
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Korean-market original
A 30ml brightening serum for uneven, dull looking skin, stocked in the Original Korean Formula.
Verify your unit when it arrives
Verify your unit when it arrives
Korean-market stock with the original barcode and batch code intact, exactly as it left Korea.
Match the batch code on the box against the code printed on the bottle or tube itself; the two are stamped separately and should agree.
On the unit itself
- The Korean-market barcode, unaltered from the retail package.
- The manufacturer’s batch code, exactly as the maker printed it.
정품Genuine article, Korean-market stock
What professionals say
What professionals say
What skin-care professionals say about the key actives in this formula, quoted from the medical sources linked beside each.
It can be especially useful for skin that is easily irritated or prone to redness, including conditions such as rosacea, eczema and contact dermatitis.
Derrick Phillips, MDConsultant dermatologist, Vogue Squalane comes from a lipid that occurs naturally in your skin.
Alok Vij, MDDermatologist, Cleveland Clinic
1 more professional perspective
Niacinamide helps reduce the appearance of pores in a few ways. By strengthening the skin barrier and improving elasticity, pores appear less noticeable and more even.
Ashlyn YankeAesthetician, Cleveland Clinic
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