COSRX
Deep Wrinkle Care Boost
COSRX's Deep Wrinkle Care Boost, built on 0.3% retinol, a treatment step for the evening routine only, worn after toner and before moisturizer a few nights a week to start.
No reviews yet- Ships from our California warehouse
- Duties prepaid
- Suited to
- MatureFine linesSensitiveCompromised barrier
- Helps with
- Fine lines and loss of bounceBarrier weaknessDehydrationEarly environmental damage
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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
A boost step is a treatment layer rather than a whole routine: it goes on after toner and before moisturizer, and it is the part of a routine that changes when a concern changes. This one is named for the look of lines, which is slow work measured over months rather than weeks. It belongs in the evening, on skin that has been cleansed and toned, with a plain moisturizer over the top. Skin new to a treatment step of any kind does better easing in over a few evenings a week rather than starting nightly. Sunscreen the following morning is part of any routine built around a line-care step.
Key benefits
- Retinol is declared at 0.3% on the ingredient list itself
- Vitamin C and glutathione cover the brightening side of the pairing
- Shea butter, soybean oil and hyaluronate forms cushion the retinol
- Adenosine and tocotrienols round out the smoothing support
Key actives
Retinol
the reference smoothing active, declared at 0.3%
Ascorbic Acid
vitamin C for visible brightening
Glutathione
an antioxidant that supports a luminous tone
Adenosine
supports a smoother, firmer look
COSRX Deep Wrinkle Care Boost
What is the Deep Wrinkle Care Boost actually built around?
Retinol is declared at 0.3% on the ingredient list, appearing after a cushioning base of shea butter, soybean oil and cetearyl alcohol, so it sits in a formula designed to support it rather than deliver it alone. Ascorbic acid, 3-O-ethyl ascorbic acid and glutathione appear further down as the brightening side of the formula, alongside adenosine and sodium hyaluronate. This is a two-part formula pairing a declared-percentage retinol with a brightening actives group rather than a single-ingredient product.
Can retinol-sensitive skin tolerate a formula like this?
The list is built around a heavy cushioning base, shea butter, soybean oil, sunflower seed oil and tocopherol among them, which is typical of formulas meant to buffer retinol for skin new to it. Fragrance, essential oil, denatured alcohol and paraben are all absent from the list. Retinol at any declared strength can still cause dryness or flaking while skin adjusts, so starting at a lower frequency is the standard approach regardless of the buffering ingredients around it.
Does retinol at 0.3% work immediately or does it take time?
Retinol works through gradual cell turnover rather than an overnight change, so the declared 0.3% concentration here is meant to be used consistently over weeks rather than expected to show results after a few nights. Skin often goes through an adjustment period of mild dryness or sensitivity before it settles into a routine with a retinol product. Consistency, not frequency, is what determines whether the formula does its job over time.
How should this pair with sunscreen and other actives?
Retinol increases how sensitive skin can feel toward sun exposure, so a separate daytime sunscreen step is standard practice whenever a retinol product is in a routine, though that sunscreen is not part of this list itself. The brightening actives here, ascorbic acid and 3-O-ethyl ascorbic acid, are generally used at a different time of day from the retinol side. Check both products' own instructions for the exact order that suits your skin.
- 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
We accept
How to use
- Use the Deep Wrinkle Care Boost after toner and before moisturizer, in the evening.
- A few drops or a thin layer over the face, kept clear of the eyelids and the corners of the mouth.
- Toner first, this second, then a plain moisturizer over the top.
- Start at two or three evenings a week and build from there. Do not stack it with an exfoliating acid on the same evening.
Reviews
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Write Reviews (opens in a new tab)COSRX, Korean-market original
Age-care duo: 0.3% retinol night cream plus a vitamin C 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.
Vitamin A has a molecular structure that's tiny enough to get into the lower layers of your skin, where it finds and boosts collagen and elastin, which is a protein that strengthens your skin's flexibility.
Wilma Bergfeld, MDDermatologist, Cleveland Clinic Using topical vitamin C can result in less cell damage and better-looking skin.
Melissa Piliang, MDDermatologist, Cleveland Clinic
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