Frankly
Vitamin C 23 Pure Vitamin C Boost Serum 15ml
Frankly Vitamin C 23 Pure Vitamin C Boost Serum 15ml is a targeted serum for anyone bothered by uneven tone and dark marks, used under your moisturiser.
No reviews yet15 ml
$23.33 per 10 ml
- Korean-market formula
- Ships from California or direct from Korea
- Korean barcode and batch code intact
- Suited to
- Normal skinCombination skinDry skin
- Helps with
- The look of uneven toneThe look of dark marksA more even looking finish
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
How it works
The texture is light and fast sinking, which is what a serum needs to be to go under a moisturiser without piling up. A few drops cover the whole face, and the finish it leaves is close to bare skin rather than glossy. A more even looking tone comes from weeks of consistency rather than from any single application, which is why this kind of step is judged by the month. An ampoule is the same idea at a higher strength and a shorter course, while a serum is the everyday version of it. The result you can judge yourself is whether your tone looks more even in the same light over several weeks.
Key benefits
- On this formula's own list, Ascorbic Acid shows up near the top. It is a vitamin C derivative included for its brightening, antioxidant role.
- This one's ingredient list carries Butylene Glycol near the top, a multifunctional glycol that carries moisture and helps preserve the formula.
- Allantoin sits in the back half on this product's own ingredient list, a soothing agent that supports comfort on sensitised skin.
Inside the formula
Inside the formula
What is Vitamin C 23 Pure Vitamin C Boost Serum 15ml?
It is a targeted serum from Frankly, made for anyone bothered by uneven tone and by the look of the dark marks a breakout leaves behind. It goes on after your toner and before your moisturiser, so it reaches clean skin rather than sitting on a cream. The result you can judge yourself is whether your tone looks more even in the same light over several weeks.
Where does Vitamin C 23 Pure Vitamin C Boost Serum 15ml go in my routine?
It goes on after your toner and before your moisturiser, so it reaches clean skin rather than sitting on a cream. In practice: Press three or four drops over the face after your toner, then follow with your moisturiser once it has settled. Applying it out of that order is the usual reason a step seems to do nothing.
Is Vitamin C 23 Pure Vitamin C Boost Serum 15ml right for my skin type?
It is aimed at anyone bothered by uneven tone and by the look of the dark marks a breakout leaves behind. The skin types we would put first are normal skin, combination skin and dry skin. Tone work is slow work, so photograph the same area in the same light every fortnight rather than judging it in a different mirror each week.
Can I use it in the morning and at night?
Most people can, and the honest answer depends on what else is in the routine. Using it twice a day is fine when nothing else you apply is a strong treatment step. If your evenings already carry an acid or a retinoid, keep this to the mornings so you are not stacking working steps on tired skin.
Is this Vitamin C 23 Pure Vitamin C Boost Serum 15ml the authentic Korean-market formula?
Yes. We stock the Frankly Korean-market formula rather than a version reformulated for US shelves. The bottle you open is the 15ml one sold on Korean shelves, with Korean-primary packaging and an intact barcode you can check yourself.
Not on the ingredient list below: fragrance or parfum, denatured or SD alcohol, essential oils, silicones, parabens, sulfate surfactants, mineral oil or petrolatum and added color.
Full INCI (18): Water, Ascorbic Acid (23%), Isohexadecane, Butylene Glycol, 1,2-Hexanediol, Cetyl Ethylhexanoate, Sodium Hydroxide, Glycerine, alpha-bisabolol, Ascorbyl Tetraisopalmitate, Rheum Palmatum Root Extract, Allantoin, Sodium Bicarbonate, Hydroxyethylcellulose, Betaine, Ferulic acid, Tocopheryl Acetate, Disodium EDTA
Ingredient list read from jolse.com on 10 September 2026.
18 of 18 explained
- Water solvent
- Water is the base almost every serum, toner and cream is built on. It dissolves the water-loving ingredients and sets how light the finished texture feels. On an INCI list it is usually first, which only means it is the largest single ingredient by weight.
- Ascorbic Acid (23%) 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.
- Isohexadecane emollient
- Isohexadecane is a branched hydrocarbon emollient that spreads easily and leaves a dry finish. It is often paired with a thickener to build a gel-cream.
- 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.
- 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.
- Cetyl Ethylhexanoate emollient
- Cetyl Ethylhexanoate is a synthetic ester used as a dry-feeling emollient. It spreads easily, leaves a silky rather than oily finish, and helps disperse pigments and UV filters evenly.
- Sodium Hydroxide pH adjuster
- Sodium Hydroxide is a strong base used in traces to bring an acidic formula up to skin-friendly pH. None of it remains as itself once the formula is neutralised.
- Glycerine 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.
- alpha-bisabolol active
- Bisabolol is the main active fraction of chamomile oil, usually supplied from candeia wood. It is used for the look of redness in formulas for reactive skin, and it helps other ingredients absorb.
- Ascorbyl Tetraisopalmitate antioxidant
- Ascorbyl Tetraisopalmitate is an oil-soluble vitamin C ester, also sold as tetrahexyldecyl ascorbate. Being oil soluble it sits in the oil phase and is far more stable than pure vitamin C.
- Rheum Palmatum Root Extract plant extract
- Chinese rhubarb root extract. The root carries anthraquinones and tannins, giving it an astringent character, and it can tint a formula yellow.
- 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.
6 more explained
- Sodium Bicarbonate pH adjuster
- Baking soda. In a formula it raises pH, and in a fizzing product it is the half that meets an acid and releases carbon dioxide.
- Hydroxyethylcellulose thickener
- Hydroxyethylcellulose is a cellulose thickener that builds a clear, smooth gel and holds the rest of the formula in suspension.
- Betaine humectant
- Betaine is a sugar-beet-derived humectant that cells use to hold water. In a formula it hydrates and takes the edge off cleansers and acids, which is why it often appears alongside them.
- Ferulic acid antioxidant
- Ferulic Acid is a plant antioxidant from bran and seeds. Its main formulation job is stabilising vitamins C and E so a serum keeps working for longer, which is why the three appear together so often.
- Tocopheryl Acetate antioxidant
- Tocopheryl Acetate is a stable vitamin E ester that skin converts to tocopherol. It is used as an antioxidant and a light emollient and holds up better than plain vitamin E in a formula.
- 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.
- Market
- Korean market, the version sold in Korea
- EAN (barcode)
- 8809863720610
- Made in
- Republic of Korea
- Volume
- 15 ml
- Category
- Serum & Ampoule
- Actives
- Allantoin, Bisabolol, Vitamin C
- 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. The barcode in the specification above is the Korean-market one and it is printed on the box you receive.
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 to use
- Use it after cleansing and toning, while the surface is still slightly damp.
- Press three or four drops over the face and neck rather than rubbing them in.
- Wait until it feels dry to the touch, then apply your moisturiser over the top.
- Do not apply it over a cream or an oil, since a light serum cannot get through a finished occlusive layer.
Worth knowing
- Patch test on a small area first, since tone focused steps are the ones most likely to sting on reactive skin.
- Give it several weeks of consistent use before you judge it, and change one thing at a time in your routine.
Complete the routine
- This itemFrankly Vitamin C 23 Pure Vitamin C Boost Serum 15ml$35.00
- From the same Korean-market lineFRANKLY Glow Filter Tone Up Cream 50ml$32.50
- The treatment step of this routineFRANKLY PDRN Bounce Ball Serum 30ml$55.00
Total for 3 items$122.50
Reviews
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FRANKLY Vitamin C 23 Pure Vitamin C Boost Serum 15ml
How it felt, how your skin took it, what you layer it with. Straight answers help the next person choose.
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Frankly, Korean-market original
A targeted serum for anyone bothered by uneven tone and dark marks. We stock the authentic Frankly Korean-market formula in 15ml.
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 skin care, quoted from the medical sources linked beside each.
Your skin barrier is basically your outer layer of the skin.
Melissa Piliang, MDDermatologist, Cleveland Clinic Pretty much every step of a Korean skin care routine is going to have some component of hydration.
Alok Vij, MDDermatologist, Cleveland Clinic
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