Brightening Boost
A brightening duo that pairs the peptide skin booster serum with the brand's high-strength brightening serum for tone and texture in a single routine.
No reviews yet- Ships from California or direct from Korea
- Korean barcode and batch code intact
- Suited to
- MatureFine linesSensitiveCompromised barrier
- Helps with
- Fine lines and loss of bounceBarrier weaknessDehydrationEarly environmental damage
Sold out.
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One email, the moment this exact unit is back in stock. Not a newsletter and not a sequence, and your address comes off the list the second it is sent.
- 30-day returns
- Free US shipping on orders of $100 or more
- Tracked delivery to your door
How it works
Uneven tone and a surface that feels less firm are two problems a single serum often cannot fix alone. This serum lists niacinamide sixth, behind the base humectants, with adenosine and a run of peptides, Copper Tripeptide-1 among them, and sodium hyaluronate in the back half. That combination pairs a tone-evening ingredient with a peptide complex rather than one active alone. Consistent use tends to leave skin looking more even and firmer over weeks rather than days. Apply it on toned skin before moisturizer, with steady daily use.
How to use
- Use the Brightening Boost after toner and before moisturizer, morning or evening.
- A few drops pressed over the face and neck, then left a minute to settle.
- Toner first, this second, then moisturizer, and sunscreen if it is the morning.
- Once a day to start. Do not use it in the same routine as an exfoliating acid; give that its own evening.
COSRX Brightening Boost
What is the Brightening Boost serum built around?
Niacinamide sits sixth on the list, behind water, dipropylene glycol, glycerin, pentylene glycol, and 1,2-hexanediol, with adenosine and a run of peptides, including Copper Tripeptide-1, Acetyl Hexapeptide-8, and Oligopeptide-68, further down. Sodium hyaluronate also appears in the back half. That combination describes a niacinamide and peptide serum aimed at tone and a firmer surface look rather than a single-ingredient formula.
Is this serum suitable for sensitive skin looking for a gentle brightening step?
The list has no fragrance, no essential oil, no added silicone, no paraben, and no mineral oil. That profile suits sensitive skin drawn to a fragrance-free serum built around niacinamide and peptides rather than a stronger acid or retinoid. Anyone managing a diagnosed reactive condition should still check the full ingredient list above against their own known triggers first.
How long does it take to notice a difference in tone or firmness?
Niacinamide's effect on an even-looking tone and the peptides' role in supporting a firmer surface both build with consistent daily use rather than showing up after a single application. Skin dealing with uneven tone or reduced elasticity tends to change gradually over weeks of steady application, not after one bottle. This list does not declare a percentage for niacinamide, so no specific strength is claimed here.
Can I layer a brightening or retinoid product with this serum?
This particular list does not include vitamin C or a retinoid, so it functions on its own as a niacinamide and peptide step rather than a base built to carry another active. Applying it after toner and before a separate treatment serum is a reasonable order, but how well a specific brightening or retinoid product pairs depends on that product's own formula. Introduce any new combination slowly.
- Ships from
- California or Korea
Orders ship from California or direct from Korea with tracked delivery to your door, and both routes carry the same Korean-market release. Shipping is free on orders of $100 or more. Returns are accepted for 30 days, by mail.
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 - 2Barcode
Listed against the Korean barcode on its box - 3California or Korea
Ships to you from either, as the same Korean-market release
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.
Every order ships from California or direct from Korea, 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.
Key benefits
- The booster component lists six peptide entries, copper tripeptide among them
- Niacinamide and adenosine support a smoother, more even look
- Amino acids and sodium hyaluronate keep the base hydrating
Key actives
Copper Tripeptide (GHK-Cu)
the best-known of the booster's six peptides
Niacinamide
supports a brighter, more even look
Sodium Hyaluronate
draws and holds water at the surface
Reviews
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COSRX Brightening Boost
How it felt, how your skin took it, what you layer it with. Straight answers help the next person choose.
COSRX
Brightening duo: peptide booster serum plus the brightening serum.
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.
COSRX verifies units itself. Find the verification page on cosrx.com and enter the batch number and expiration date printed on your unit. Read them off the package rather than from us, which is the point.
Source: COSRX FAQ
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.
Peptides can be anti-inflammatory, and chronic inflammation damages the tissue in your skin.
Wilma Bergfeld, MDDermatologist, Cleveland Clinic Hyaluronic acid helps bind water to collagen, which traps water in the skin. That helps make the skin more plump and full-looking.
Samantha Stein, PA-CDermatology physician assistant, 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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