MEDIHEAL Vitamin C Essential Mask Clear Toning 24ml X 10ea
MEDIHEAL Vitamin C Essential Mask Clear Toning 24ml X 10ea is a sheet mask that names 3-O-Ethyl Ascorbic Acid on its own ingredient panel, sourced as the Korean-market formula.
No reviews yet- Ships from our California warehouse
- Duties prepaid
- Suited to
- Sensitive skinNormal skinDry skin
- Helps with
- A formula built around NiacinamideAn occasional, concentrated sheet mask stepA layered Korean routine
In stock. Ships from our California warehouse, dispatched within 2 business days
You’re $100.00 away from free US shipping.
- Duties prepaid
- 30-day returns
- Free US shipping on orders of $100 or more
- Dispatched within 2 business days
Key benefits
- 3-O-Ethyl Ascorbic Acid named on this product's own ingredient panel
- Niacinamide on the same panel, the formula's active
- Citrus Unshiu Peel Extract on the same panel, the formula's plant extract
- Korean GS1 barcode matched against a Korea sourcing supplier's record for this item
Key actives
3-O-Ethyl Ascorbic Acid
3-O-Ethyl Ascorbic Acid is a stable vitamin C derivative that skin converts to ascorbic acid. It survives in a formula far better than pure vitamin C and works at a gentler pH, so it suits skin that finds the pure acid uncomfortable.
Ascorbic Acid
Ascorbic Acid is pure vitamin C, the most researched form and also the least stable: it needs a low pH and airtight packaging to stay active. It is an antioxidant used for the look of dullness and uneven tone.
Niacinamide
Niacinamide is vitamin B3, and it is the most studied active in Korean formulation. It is used at roughly 2 to 5 percent for the look of uneven tone and visible pores, and it is water soluble, stable and comfortable beside almost every other active, which is why it turns up in so many lists.
Citrus Unshiu Peel Extract
The peel extract of the satsuma mandarin, the gyul grown on Jeju. It carries flavonoids and aromatic oils and is used as a conditioning antioxidant extract.
Hippophae Rhamnoides Extract
Sea buckthorn extract. The plant is unusually rich in vitamin C and carotenoids, and the extract is used as an antioxidant conditioning ingredient.
How to use
- Unfold the sheet and smooth it onto a cleansed face, adjusting it around the eyes, nose and mouth. Leave it on for 15 to 20 minutes, then remove and pat any remaining essence into the skin rather than rinsing it off.
What does Niacinamide do in this sheet mask?
Niacinamide sits among the first ingredients on the list, the tone-evening, barrier-supporting active Korean formulas lean on most often, and its early position here means it is not a token dose.
Is Panthenol also in this formula?
Panthenol (pro-vitamin B5) sits in the middle of the ingredient list as the formula's moisture-retention and comfort ingredient, a standard soothing base in Korean-market formulas. It sits alongside Niacinamide on MEDIHEAL's ingredient list for this product.
How is this sheet mask used in a routine?
Unfold the sheet and smooth it onto a cleansed face, adjusting it around the eyes, nose and mouth. Leave it on for 15 to 20 minutes, then remove and pat any remaining essence into the skin rather than rinsing it off. It works as an occasional, concentrated step layered over a completed routine, not a daily one.
Who is this sheet mask suited for?
Sensitive skin, Normal skin are the best fit for this sheet mask. Patch test on the inner arm before first full use, as with any new skincare product.
- 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 it works
3-O-Ethyl Ascorbic Acid is named on the ingredient panel on this sheet mask. 3-O-Ethyl Ascorbic Acid is a stable vitamin C derivative that skin converts to ascorbic acid. It survives in a formula far better than pure vitamin C and works at a gentler pH, so it suits skin that finds the pure acid uncomfortable. On this panel it sits alongside Niacinamide, Citrus Unshiu Peel Extract and Hippophae Rhamnoides Extract. Niacinamide is vitamin B3, and it is the most studied active in Korean formulation. It is used at roughly 2 to 5 percent for the look of uneven tone and visible pores, and it is water soluble, stable and comfortable beside almost every other active, which is why it turns up in so many lists.
Worth knowing
- Patch test on the inner arm before first full use, as with any new skincare product.
- Introduce a new active gradually into an existing routine rather than adding several at once.
Reviews
No reviews yet. Tell us how much you love the product!
Write Reviews (opens in a new tab)We’re on gram!
Creators trying on authentic Korean skincare routines and products from us.
Rating a shelf of Dr. Althea products one by one.
Jasmine Loo · YouTube
Two hydrating serums side by side, IUNIK and Dr. Althea.
Kristin · YouTube
A walk through the Dr. Althea serum lineup and who each one suits.
auraofmahmuda · YouTube
A blunt first take on the Dr. Althea range.
Lexi Chang · YouTube
A first look at the viral 345 Relief Cream before buying.
Shelley Nayak · YouTube
A first try of the Dr. Althea serum on camera.
Hannah Ziad · YouTube
Korean-market original
MEDIHEAL's Vitamin C Essential Mask Clear Toning 24ml X 10ea, sourced for the Korean market.
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.
Using topical vitamin C can result in less cell damage and better-looking skin.
Melissa Piliang, MDDermatologist, Cleveland Clinic 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
1 more professional perspective
These mechanisms not only reinforce barrier function but also mitigate inflammation and accelerate healing.
Yang TangAssistant Professor, Beijing University of Chinese Medicine, Frontiers in Pharmacology
Ask an AI assistant about this product
Ask an AI assistant about this product
Opens ChatGPT, Perplexity or Claude in a new tab with the question prefilled. Claude asks you to sign in first.









