What is the VT Cosmetics Vitamin C Astaxanthin Serum for?

It is a step zero booster ampoule in VT's Reedle Shot family, with Niacinamide listed fifth on the ingredient panel. The formula runs a centella-family and hydration base underneath, and it is meant to be used as a consistent step rather than a single fast fix.

What does the Vitamin C Astaxanthin Serum actually do for skin?

Arginine sits 15th on the list, close enough to the front that it is doing real work rather than trace-level formulation. Between Niacinamide at fifth and Arginine at 15th, this formula leans toward tone, texture and comfort together rather than a single narrow claim.

How and when should I use the Vitamin C Astaxanthin Serum?

Used as a step zero, it goes on right after cleansing and before serum, so it settles into the skin ahead of anything heavier rather than sitting on top of a finished routine. A small amount pressed in with clean hands is enough, morning or night, and there is no need to wait for it to fully dry before layering the next step.

Is the Vitamin C Astaxanthin Serum suitable for sensitive skin?

This formula's own ingredient list leans toward comfort and everyday tolerability rather than an aggressive exfoliating routine, so most skin types adjust to it without much fuss. A patch test on the inner arm is still the safer first step with any new formula.

VT Cosmetics

Vitamin C Astaxanthin Serum

Name: VT Cosmetics Vitamin C Astaxanthin Serum
Brand: VT Cosmetics
Price: 26.99 USD
Availability: OutOfStock

VT's vitamin C and astaxanthin serum. It is the middle step between toner and cream, morning or evening, in a routine working on tone.

Reviewed by Nurcan Saglam, licensed dermo-cosmetic expert (Paris)

No reviews yet

$26.99

30ml

$89.97 per 100 ml

Korean-market formula
Ships from California or direct from Korea
Korean barcode and batch code intact

Helps with: Texture and fine linesA first step zero layer before serumOverall hydration support

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Key benefits

Niacinamide listed fifth on the ingredient list, tone and texture
Arginine listed 15th on the ingredient list, pH balance, moisture support
Sodium Hyaluronate listed 18th on the ingredient list, hydration
Squalane listed 21st on the ingredient list, lightweight emollient
Positioned as a step zero booster ahead of serum in VT's Reedle Shot format
Meant to be layered under whatever serum or cream a routine already runs

Key actives

5Niacinamidefifth on the list, tone and texture

Niacinamide is a tone and texture ingredient that shows up across most of VT's Reedle Shot line, doing brightening and surface-refining work rather than deep hydration. Listed fifth among the ingredients, it sits where the formula's own INCI order places its real weight in the mix.

All products with Niacinamide

14Arginine15th on the list, pH balance, moisture support

Arginine is an amino acid that helps balance formula pH and supports the skin's own moisture-holding proteins. Listed 15th among the ingredients, it sits where the formula's own INCI order places its real weight in the mix.

All products with Arginine

17Sodium Hyaluronate18th on the list, hydration

Sodium Hyaluronate is the salt form of hyaluronic acid, a lightweight humectant that draws and holds water at the skin's surface rather than sitting on top of it. Listed 18th among the ingredients, it sits where the formula's own INCI order places its real weight in the mix.

All products with Sodium Hyaluronate

20Squalane21st on the list, lightweight emollient

Squalane is a lightweight, non-greasy emollient that softens texture without leaving the heavy film a mineral oil would. Listed 21st among the ingredients, it sits where the formula's own INCI order places its real weight in the mix.

22Adenosine23rd on the list, fine-line and texture smoothing

Adenosine is a Korean-formulation staple recognised for smoothing fine lines and texture, common enough in domestic Korean skincare to be treated as a routine inclusion rather than a headline. Listed 23rd among the ingredients, it sits where the formula's own INCI order places its real weight in the mix.

All products with Adenosine

Inside the formula

Ingredients declared

No fragrance

on the list

5Niacinamide14Arginine17Sodium Hyaluronate20Squalane

5Niacinamide
14Arginine
17Sodium Hyaluronate
20Squalane

Where each key active sits on the declared ingredient list, by entry number. Position is proportion: the further forward, the larger its share.

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VT Cosmetics Vitamin C Astaxanthin Serum

49 of 51 explained

Citrus Junos Fruit Water plant extract: Yuja fruit water, used in place of part of the plain water in a formula. It is far more dilute than the fruit extract.
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.
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.
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.
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.
Dipropylene Glycol humectant: Dipropylene Glycol is a glycol used as a solvent and a light humectant. Its main job is keeping the rest of the formula dissolved and the texture fluid rather than adding hydration of its own.
Propanediol humectant: Propanediol is a plant-derived glycol used in place of propylene glycol. It hydrates, carries actives into solution, and gives a lighter, less sticky slip than glycerin at the same strength.
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.
Isononyl Isononanoate emollient: Isononyl Isononanoate is a branched ester used as a dry emollient. It spreads far for its weight and leaves almost no residue, which is why it appears in formulas that have to feel weightless.
Isopentyldiol solvent: Isopentyldiol is a glycol used as a light solvent and humectant. It thins a formula, keeps extracts dissolved and leaves a dry finish.
Polyglyceryl-10 Laurate emulsifier: Polyglyceryl-10 Laurate is a sugar-derived emulsifier and solubiliser, mild enough to be a standard choice in Korean essences. It dissolves small amounts of oil into water without any tightening feel.
Ammonium Acryloyldimethyltaurate/Vp Copolymer thickener: This is a synthetic thickener that gels quickly and holds an emulsion stable across a wide pH range. It gives a light, non-tacky body.

37 more explained

Caprylic/Capric Triglyceride emollient: Caprylic/Capric Triglyceride is the light fraction of coconut oil, with the heavy parts removed. It is the workhorse emollient of modern formulas: it softens skin, dissolves oil-soluble actives and absorbs without the greasy weight of a whole plant oil.
Arginine amino acid: Arginine is an amino acid that does two jobs here: it holds water in the outer layer of skin, and it neutralises acidic gelling agents, which is why it often stands in for a synthetic pH adjuster.
Acrylates/C10-30 Alkyl Acrylate Crosspolymer thickener: This is a carbomer relative with fatty side chains, so it thickens and stabilises an emulsion at the same time. It gives a light gel-cream body rather than a heavy one.
Coptis Japonica Root Extract plant extract: Coptis Japonica is a traditional East Asian medicinal root, bright yellow from its berberine content. In skincare its extract is used for the look of congested, oily skin.
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.
3-O-Ethyl Ascorbic Acid antioxidant: 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.
Ethylhexylglycerin preservative booster: Ethylhexylglycerin softens skin and boosts a preservative system, which is why it is nearly always sitting beside phenoxyethanol or 1,2-hexanediol. It also cuts down the odour bacteria produce, so it turns up in deodorising products.
Squalane emollient: Squalane is the stable, saturated version of squalene, a lipid human skin already makes. It is a light emollient that absorbs quickly, does not oxidise, and is one of the few oils widely considered safe for blemish-prone skin. Most cosmetic squalane is now from sugarcane or olive rather than shark.
Castor Oil/Ipdi Copolymer film former: A polymer built from castor oil. It forms a flexible, glossy film, so it is used in lip and long-wear formulas for shine and staying power.
Adenosine active: Adenosine is a nucleoside that Korea's own cosmetic authority recognises as a wrinkle-care functional ingredient, which is why it appears on so many Korean lists at a low level. It is used for the look of fine lines and is stable and well tolerated.
Hydrogenated Poly(C6-20 Olefin) emollient: Hydrogenated Poly(C6-14 Olefin) is a synthetic hydrocarbon emollient. It gives a smooth, silicone-like glide and is completely stable, so it does not go rancid.
Ubiquinone antioxidant: Ubiquinone is coenzyme Q10, an antioxidant every cell uses in its own energy production. In a formula it is oil soluble, faintly yellow, and used for the look of tired, dull skin.
Sodium Phytate chelator: Sodium Phytate is a rice-derived chelator used in place of EDTA. It ties up trace metals so the formula stays stable and its colour and scent hold.
Lithospermum Erythrorhizon Root Extract plant extract: Purple gromwell root, long used in Korean and Chinese herbal practice. The root is deep red-purple, so it colours a formula, and it is used for the look of reactive skin.
Hdi/Trimethylol Hexyllactone Crosspolymer absorbent: A spherical polymer powder. The spheres roll under the fingers, absorb a little oil and scatter light, which softens the look of pores and fine lines.
Tromethamine pH adjuster: Tromethamine neutralises acidic thickeners such as carbomer so they gel, and holds a formula near skin-friendly pH. It is used at a fraction of a percent.
Astaxanthin antioxidant: Astaxanthin is a deep red antioxidant from microalgae, the pigment that makes salmon pink. It is oil soluble, colours a formula noticeably, and is used as an antioxidant.
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.
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.
Sodium Ascorbyl Phosphate antioxidant: Sodium Ascorbyl Phosphate is a water-soluble, stable vitamin C salt. It works at near-neutral pH, so it appears in formulas aimed at skin that pure ascorbic acid leaves stinging.
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.
Ascorbyl Glucoside antioxidant: Ascorbyl Glucoside is vitamin C bound to glucose, which keeps it stable until enzymes in skin release it. It is a mild, slow-release route to a vitamin C formula.
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.
Kojic Acid active: Kojic Acid comes from the fermentation of rice by Aspergillus, the mould used to make sake. It is used in formulas addressed to the look of uneven tone, and it darkens in air.
Hydroxypropyltrimonium Hyaluronate humectant: Hydroxypropyltrimonium Hyaluronate carries a positive charge, and skin carries a slight negative one, so it is attracted to the surface and stays through rinsing. It is the hyaluronic used where a formula gets washed off.
Hydrogenated Lecithin emulsifier: Hydrogenated Lecithin is lecithin with its unsaturated bonds filled in, which makes it far more stable. It emulsifies and is the standard shell for the liposomes that carry actives into the outer layer of skin.
Polyglyceryl-3 Methylglucose Distearate emulsifier: Polyglyceryl-3 Methylglucose Distearate is a sugar-derived emulsifier known for a light, non-soapy feel. It builds gel-creams that do not read as rich.
Citrus Junos Fruit Extract plant extract: Yuja fruit extract, the Korean citrus preserved as yuja tea. It carries vitamin C, fruit acids and flavonoids.
Glutathione antioxidant: Glutathione is a small peptide the body uses as one of its main antioxidants. In skincare it is used as an antioxidant and for the look of dullness; it is unstable in water, so formulas that carry it are usually built around protecting it.
Hydrolyzed Hyaluronic Acid humectant: Hydrolyzed Hyaluronic Acid is hyaluronic acid cut into much shorter fragments. The smaller the fragment, the further into the outer layer it can settle, which is why serums stack several sizes together instead of using one.
Sodium Acetylated Hyaluronate humectant: Sodium Acetylated Hyaluronate is hyaluronic acid modified to be part oil-loving, so it clings to skin instead of rinsing away. Formulators call it the one that stays put.
Hyaluronic Acid humectant: Hyaluronic Acid is a sugar chain the body already makes, and one gram of it can hold several litres of water. In a formula it is a humectant that pulls water to the surface of skin and holds it in a film, which is what makes skin look plumper while it is there.
Sodium Hyaluronate Crosspolymer humectant: Sodium Hyaluronate Crosspolymer is hyaluronic acid linked into a mesh. It holds water in a soft gel on the surface rather than sinking in, and it releases that water slowly through the day.
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.
Potassium Hyaluronate humectant: Potassium Hyaluronate is another salt of hyaluronic acid, used for the same reason as the sodium form: it dissolves easily and holds a large amount of water in the outer layer of skin.
Ceramide NP barrier lipid: Ceramide NP is the most used cosmetic ceramide, the same class of lipid that makes up roughly half the mortar between cells in the outer layer of skin. Added to a cream it slots into that structure, which is why ceramide formulas feel less leaky rather than merely greasy.
Limonene fragrance component: Limonene is the citrus-peel aromatic. It appears here because EU labelling requires 26 fragrance components to be named individually rather than hidden inside "fragrance", and it is one of them.

How it works

Vitamin C Astaxanthin Serum is built as a step zero booster, the layer VT's Reedle Shot line places before serum rather than after it. The ingredient list places Niacinamide at fifth, Arginine at 15th, Sodium Hyaluronate at 18th, which is the formula's own account of where its real weight sits rather than a headline claim. Hydration-focused ingredients round out the rest of the list, giving the formula a moisture-supporting base under its lead actives. Used before serum, it is meant to prime the skin so what follows settles rather than sitting on the surface. VT sells this as the core entry in its Reedle Shot family, and the formula is meant to be layered under whatever serum or cream a routine already runs.

How to use

Use it between toner and cream, morning or evening.
A pump patted over the face rather than rubbed in.
In the morning, sunscreen goes over the top as the last step.
Do not use it alongside another tone serum; one of them is doing the work.

Worth knowing

Anyone new to an ingredient on this formula's own list still does well to patch test on the inner arm before a first full application.

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