MEDITHERAPY
Yuja Vitamin C 20 Glow Serum 30ml
Yuja Vitamin C 20 Glow Serum is a brightening-focused serum from MEDITHERAPY, built around Ascorbic Acid and Niacinamide alongside Citrus Junos (Yuja) Peel Oil on its own ingredient list, meant for morning use under sunscreen.
No reviews yet30 ml
$191.67 per 100 ml
- Korean-market formula
- Ships from California or direct from Korea
- Korean barcode and batch code intact
- Suited to
- NormalCombinationDry
- Helps with
- A targeted treatment step between toner and moisturizerA concentrated step layered under a moisturizerDaily use as the treatment step of a routine
In stock. Arrives in 3 to 7 business days
We accept
You’re $100.00 away from free US shipping.
- 30-day returns
- Free US shipping on orders of $100 or more
- Tracked delivery to your door
Key benefits
- Built on Ascorbic Acid, pure vitamin C, the most active but least stable form used
- Niacinamide runs alongside it, the brightening and barrier-support active
- Parfum appears on the ingredient list, part of this formula's scent profile
- 30ml serum sold in MEDITHERAPY's Korean-market packaging, not a US-reformulated version
- Takes after toner and before moisturizer
- 22 ingredients on the manufacturer's own list, in the order MEDITHERAPY lists them
Key actives
4Ascorbic Acid
Ascorbic Acid is Pure vitamin C, the most active but least stable form used. It appears at position 5 of 22 on MEDITHERAPY's own manufacturer ingredient list for this formula, which is real evidence of what the formula is built around rather than a marketing label placed over it.
6Niacinamide
Niacinamide is The brightening and barrier-support active. It appears at position 7 of 22 on MEDITHERAPY's own manufacturer ingredient list for this formula, which is real evidence of what the formula is built around rather than a marketing label placed over it.
7Sodium Hyaluronate
Sodium Hyaluronate is A hyaluronic form working at the surface. It appears at position 8 of 22 on MEDITHERAPY's own manufacturer ingredient list for this formula, which is real evidence of what the formula is built around rather than a marketing label placed over it.
8Allantoin
Allantoin is A calming, comedolytic-adjacent skin-conditioning agent. It appears at position 9 of 22 on MEDITHERAPY's own manufacturer ingredient list for this formula, which is real evidence of what the formula is built around rather than a marketing label placed over it.
Inside the formula
Inside the formula
- 4Ascorbic Acid
- 6Niacinamide
- 8Allantoin
Where each key active sits on the declared ingredient list, by entry number. Position is proportion: the further forward, the larger its share.
Is the Yuja Vitamin C 20 Glow Serum 30ml sold here MEDITHERAPY's Korean-market formula?
Yes. What ships is MEDITHERAPY's release for the Korean market: the formula and packaging sold in Korea, with the Korean-market barcode and batch code intact on the box rather than swapped for an export or US-retail label.
Where does the Yuja Vitamin C 20 Glow Serum 30ml go in a routine?
It takes after toner and before moisturizer. Use it exactly the way you would any serum at that point in a routine. A serum in this format is built to carry a concentrated dose of its named actives in a light enough base that it absorbs before the next step goes on, which is the reason this step order tends to hold across brands, not only for this one.
What does Ascorbic Acid do in this serum?
Ascorbic Acid is Pure vitamin C, the most active but least stable form used. It appears at position 5 of 22 on MEDITHERAPY's own manufacturer ingredient list for this formula, which is real evidence of what the formula is built around rather than a marketing label placed over it.
Does the Yuja Vitamin C 20 Glow Serum 30ml contain fragrance?
Yes. Parfum appears on the manufacturer's own ingredient list for this formula, contributing to its scent alongside the actives above. If a fragrance-free routine matters to you, check the position of parfum on the full list before buying.
How does buying the Yuja Vitamin C 20 Glow Serum 30ml here compare with a US retailer carrying the same name?
A US listing under the same product name can be a reformulated export version and rarely states which one it is selling. What we carry is the Korean-market MEDITHERAPY release, identified by its intact Korean barcode and batch code on the box rather than a relabeled export carton, so the unit you get matches what is sold on shelf in Korea.
Not on the ingredient list below: denatured or SD alcohol, essential oils, silicones, parabens, sulfate surfactants, mineral oil or petrolatum and added color.
Full INCI (21): Hippophae Rhamnoides (Sea Buckthorn) Fruit Extract, Glycerin, 1,2-Hexanediol, Ascorbic Acid, Citrus Junos (Yuja) Peel Oil, Niacinamide, Sodium Hyaluronate, Allantoin, Tocopherol, Panthenol, Chondrus Crispus (Carrageenan) Extract, Glyceryl Acrylate/Acrylic Acid Copolymer, Cucumis Sativus (Cucumber) Fruit Extract, Vaccinium Macrocarpon (Cranberry) Fruit Extract, Vaccinium Angustifolium (Blueberry) Fruit Extract, Rubus Idaeus (Raspberry) Fruit Extract, Caprylyl Glycol, Polyglutamic Acid, Disodium EDTA, Butylene Glycol, Fragrance
Ingredient list read from inkeedecoder.com on 10 September 2026.
20 of 21 explained
- Hippophae Rhamnoides (Sea Buckthorn) Fruit Extract plant extract
- Sea Buckthorn Fruit Extract is high in vitamin C and carotenoids, which give it a strong orange colour. It is used as an antioxidant extract.
- Glycerin humectant
- Glycerin is the most used humectant in skincare. It draws water into the outer layer of skin and holds it there, and it is one of the very few ingredients whose hydrating effect is settled science rather than marketing. Higher amounts feel tacky, which is why it is usually blended.
- 1,2-Hexanediol humectant
- 1,2-Hexanediol is a glycol used for two reasons: it holds water like glycerin, and it makes a formula harder for microbes to live in, so less traditional preservative is needed. Korean formulas use it heavily for that second reason.
- Ascorbic Acid antioxidant
- 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 active
- 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.
- Sodium Hyaluronate humectant
- Sodium Hyaluronate is the salt of hyaluronic acid, and it is what most products labelled hyaluronic actually contain. The salt dissolves more readily and the molecule is smaller, so it sits in the outer layer of skin rather than only on top of it.
- Allantoin active
- Allantoin is a comfrey-derived compound used to condition skin and soften the outer layer so it feels smoother. It is one of the standard additions to a formula built for easily irritated skin.
- Tocopherol antioxidant
- Tocopherol is vitamin E. It is an oil-soluble antioxidant that protects the oils in a formula from going rancid and works on skin as an emollient, and it is regularly paired with vitamin C because each keeps the other going for longer.
- Panthenol humectant
- Panthenol is pro-vitamin B5: skin converts it to pantothenic acid. It is a humectant that holds water and leaves skin feeling soft and less tight, and it is one of the ingredients formulators reach for when a formula also contains something harsh.
- Chondrus Crispus (Carrageenan) Extract plant extract
- Chondrus Crispus is Irish moss, a red seaweed. It is loaded with carrageenan, so it hydrates and thickens at once, and it leaves a cushioned, slippery film.
- Glyceryl Acrylate/Acrylic Acid Copolymer film former
- This is a polymer that forms a moisture-holding film on the surface, usually supplied with glycerin and propylene glycol as a hydrating complex.
- Cucumis Sativus (Cucumber) Fruit Extract plant extract
- Cucumber fruit extract, mostly water with sugars and amino acids. It is used as a light hydrating extract with a fresh, cooling character.
8 more explained
- Vaccinium Macrocarpon (Cranberry) Fruit Extract plant extract
- Cranberry fruit extract, acidic and high in proanthocyanidins. It is used as an antioxidant berry extract.
- Vaccinium Angustifolium (Blueberry) Fruit Extract plant extract
- Lowbush blueberry fruit extract, high in anthocyanins. Berry extracts are used as plant antioxidants and can tint a formula.
- Rubus Idaeus (Raspberry) Fruit Extract plant extract
- Raspberry fruit extract, carrying fruit acids, sugars and anthocyanins. It is used as an antioxidant-rich conditioning extract.
- Caprylyl Glycol preservative booster
- Caprylyl Glycol is a glycol that conditions skin and, more importantly, strengthens a preservative system so less of the traditional preservative is needed. It appears in most modern formulas built without parabens.
- Polyglutamic Acid humectant
- Polyglutamic Acid comes from fermented soy and holds several times more water than hyaluronic acid for its weight. It forms a light film on the surface, so it is often layered with hyaluronic rather than replacing it.
- Disodium EDTA chelator
- EDTA is a chelator: it locks up trace metal ions from water and packaging that would otherwise turn a formula cloudy, off-colour or rancid. It does nothing to skin and appears at a fraction of a percent.
- Butylene Glycol humectant
- Butylene Glycol is a small glycol that does two jobs at once: it holds water in the top layer of skin and it dissolves plant extracts and actives that plain water cannot. It also thins a formula, which is why watery Korean essences lean on it.
- Fragrance fragrance
- Fragrance, or Parfum, is a single declaration standing for a whole scent blend, which can be dozens of materials. Regulators allow it as a trade secret, so a list showing only this word does not say what the scent is made of. It is the most common trigger named by people with reactive skin.
- Market
- Korean market, the version sold in Korea
- Made in
- Republic of Korea
- Volume
- 30 ml
- Category
- Serum & Ampoule
- 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.
How it works
Yuja Vitamin C 20 Glow Serum 30ml is a serum built on Ascorbic Acid, pure vitamin C, the most active but least stable form used, named 5 of 22 entries on MEDITHERAPY's own manufacturer INCI for this formula. Niacinamide runs alongside it, the brightening and barrier-support active, and the rest of the list rounds out a MEDITHERAPY formula built for this format rather than a stripped-down version of it. It takes after toner and before moisturizer, and the serum format is the reason it behaves the way it does once it is on skin. A serum in this format is built to carry a concentrated dose of its named actives in a light enough base that it absorbs before the next step goes on.
How to use
- Apply to clean, toned skin, pressing in gently before the next step.
Worth knowing
- A vitamin C formula: patch test first if skin is currently reactive, and introduce it gradually.
- Discontinue if irritation develops and check the ingredient list against any known sensitivity.
Complete the routine
- This itemMEDITHERAPY Yuja Vitamin C 20 Glow Serum 30ml$57.50
- From the same Korean-market lineMEDITHERAPY SOKSAL GUA SHA$75.00
- An as-needed step, in place of the prep layerMEDITHERAPY Blue Layer Water Dome Mask 34g X 4ea$45.00
Total for 3 items$177.50
Reviews
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MEDITHERAPY Yuja Vitamin C 20 Glow Serum 30ml
How it felt, how your skin took it, what you layer it with. Straight answers help the next person choose.
MEDITHERAPY, Korean-market original
Serum built on Ascorbic Acid, 30ml.
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.
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 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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