1st on the list, which puts it at an estimated 30–80% of the formula.
Aqua (EU),Deionized Water,Distilled Water,Micromatrix Fractile AN,Onsen-Sui (JPN),Purified Water
IOPE
Vitamin C Expert 25% Antioxidant Toning Serum
face serum
IOPE
face serum
Added Last edited
Fit by skin type
General, ingredient-based — not your personalized match.
See how this fits your skin
Take the skin test and I'll show you how suitable this product is for you.
Take the skin testThis powerhouse serum delivers next-level glow backed by 25% pure vitamin C. Designed to visibly brighten, firm, and smooth skin, the formula combines pure vitamin C with Penta Active technology, including glutathione, ferulic acid, and three vitamin C derivatives, to maximize stability and effectiveness. A gentle infusion of PHA helps refine skin texture, while a lightweight, oil-free base absorbs quickly without stickiness.
Vitamin C Expert 25% Antioxidant Toning Serum is a lightweight serum from IOPE, a brand based in Korea. The formula is built mainly around hydration and brightening and tone. The ingredient list runs to 32 ingredients, each broken down in full below.
By its ingredient list the formula reads as light: water and humectants lead, with emollients kept lower in the order. It contains both silicones and oils, a combination that usually finishes smooth and slightly satin and sits well under makeup. Hydration is handled by Butylene Glycol, Panthenol and Sodium Hyaluronate, humectants that pull water into the upper layers of skin rather than sealing it there.
Hydration: High. Ingredients that pull and hold water in the upper layers of skin, and here that comes from Butylene Glycol, Panthenol, Sodium Hyaluronate and Water.
Brightening: High. Ingredients that act on uneven tone and post-inflammatory marks, and here that comes from Ascorbic Acid, 3-o-ethyl Ascorbic Acid, Ascorbyl Tetraisopalmitate and Niacinamide.
Antioxidant support: Moderate. Ingredients that mop up free radicals from UV and pollution, and here that comes from Ascorbic Acid, 3-o-ethyl Ascorbic Acid, Glutathione and Ascorbyl Tetraisopalmitate.
On richness alone it suits Balanced, Combination (oily) and Oily skin best, and is the least natural fit for Dry and Combination (dry) skin. Nothing in the list is flagged as a common irritant, which is a reasonable starting point for reactive skin — though a patch test is still the only way to know.
The formula contributes little or nothing on cell renewal and firmness signalling. That is not a fault — most products are not meant to do everything — but if one of those is your priority, this is not the product that will address it.
Reading the full list, the formula is fragrance-free, essential-oil-free, no drying alcohol, paraben-free, microplastic-free and sulfate-free. Those claims come from the ingredient list itself, not from the packaging.
It can be used morning and evening. In a routine it goes after toner, before moisturiser. Apply to clean, dry skin and give it a minute to absorb before the next layer. Introduce one new treatment at a time so you can identify what is working.
This summary is generated from the product's ingredient list. It is not a review, it is not the brand's own marketing claims, and it does not replace advice from a dermatologist.
Drawn purely from the ingredient list
Scored on how rich or light the formula reads from its INCI order.
No ingredient in this formula carries a common-irritant flag, making it a reasonable option for reactive skin. A patch test is still recommended, as individual skin reactivity varies.
Based on the curated benefits documented for this product's ingredients.
Boosts collagen and cell turnover to reduce fine lines and wrinkles
Attracts and locks in moisture to keep skin plump and dewy
Brightens and balances complexion for a more uniform appearance
Calms redness, irritation, and inflammation for sensitive skin
Fades hyperpigmentation and evens out dark spots over time
Regulates sebum production to reduce shine and greasiness
Tightens and refines the look of enlarged pores
None of the ingredients in this formula are associated with these benefits. This is not unusual, as most products are designed to target a limited number of concerns.
The actives, UV filters and benefit-carrying ingredients in this formula, in the order they are listed.
1st on the list, which puts it at an estimated 30–80% of the formula.
Aqua (EU),Deionized Water,Distilled Water,Micromatrix Fractile AN,Onsen-Sui (JPN),Purified Water
2nd on the list, which puts it at an estimated 5–20% of the formula.
Ascorbic acid
4th on the list, which puts it at an estimated 2–10% of the formula.
Dimethicone
5th on the list, which puts it at an estimated 2–10% of the formula.
Butane-1,3-diol (CAS No. 107-88-0/ EC No. 203-529-7) (R)-(-)-butane-1,3-diol” (CAS No. 6290-03-5/ EC No. 228-532-0)
7th on the list, which puts it at an estimated 1–5% of the formula.
3-O-Ethyl Ascorbic Acid is the organic compound.
9th on the list, which puts it at an estimated 1–5% of the formula.
2,6,10,15,19,23-Hexamethyltetracosane
10th on the list, which puts it at an estimated 1–5% of the formula.
1H-Purine-2,6-dione, 3,7-dihydro-1,3,7-trimethyl-
12th on the list, which puts it at an estimated 1–3% of the formula.
Butanamide, 2,4-dihydroxy-N-(3-hydroxypropyl)-3,3-dimethyl-, (2R)-; dl-Panthenol
13th on the list, which puts it at an estimated 1–3% of the formula.
N-acetyl-.alpha.-D-glucosamine
14th on the list, which puts it at an estimated 1–3% of the formula.
Hyaluronic acid, sodium, salt
15th on the list, which puts it at an estimated 1–3% of the formula.
D-Glucono-1,5-lactone
16th on the list, which puts it at an estimated 1–3% of the formula.
Glycine, N-(N-L-.gamma.-glutamyl-L-cysteinyl)-
Each axis is scored from the ingredients present and how high up the list they sit.
Ingredients that pull and hold water in the upper layers of skin
Lipids and repair signals that support skin barrier integrity
Ingredients that mop up free radicals from UV and pollution
Ingredients that moderate sebum or absorb shine
Ingredients that act on uneven tone and post-inflammatory marks
Ingredients aimed at visible redness and reactivity
Retinoids, acids and enzymes that speed surface turnover
Peptides and growth factors that signal for collagen support
"Active" here means an ingredient carrying a recorded active type or a recognised UV filter.
Solvents, emollients, texture agents and preservatives — the formula that carries the actives.
Read from the full ingredient list. A brand's own claim may differ.
Dimethicone, Methyl Trimethicone
Carthamus Tinctorius Seed Oil
Judged by the same curated rules our routine checker uses. It reads the ingredients, not the label.
Best kept to separate routines — one in the morning, one at night, or on alternate days.
Best kept to separate routines — one in the morning, one at night, or on alternate days.
Can be layered, but the combination raises the irritation risk. Go slowly.
Can be layered, but the combination raises the irritation risk. Go slowly.
Can be layered, but the combination raises the irritation risk. Go slowly.
This product is the "Treat" step.
Flags to check, not verdicts. None of this is medical advice — if you are pregnant, breastfeeding or treating a skin condition, ask a doctor.
Most ingredients do more than one job, so these counts add up to more than the 32 ingredients on the label.
Changes how skin behaves rather than how it feels
Sets the thickness, spread and stability of the formula
Neutralises free radicals from UV and pollution
Softens and smooths by filling gaps between skin cells
Dissolves and carries everything else
Draws water into the upper layers of skin
Botanical material, usually for antioxidants or scent
Calms visible redness and irritation
Binds trace metals that would otherwise spoil the formula
Sets the acidity the formula needs to work
Keeps the product free of microbial growth
Lifts oil and dirt, or holds oil and water together
Forms a film that slows water loss
Every ingredient on the label, in order, with what it does and roughly how much of it is likely to be there.
1st on the list, which puts it at an estimated 30–80% of the formula.
Aqua (EU),Deionized Water,Distilled Water,Micromatrix Fractile AN,Onsen-Sui (JPN),Purified Water
2nd on the list, which puts it at an estimated 5–20% of the formula.
Ascorbic acid
3rd on the list, which puts it at an estimated 5–20% of the formula.
1,3-Propanediol, 2-amino-2-(hydroxymethyl)-
4th on the list, which puts it at an estimated 2–10% of the formula.
Dimethicone
5th on the list, which puts it at an estimated 2–10% of the formula.
Butane-1,3-diol (CAS No. 107-88-0/ EC No. 203-529-7) (R)-(-)-butane-1,3-diol” (CAS No. 6290-03-5/ EC No. 228-532-0)
6th on the list, which puts it at an estimated 2–10% of the formula.
1,1'-Oxydipropan-2-ol; Oxydipropan-2-ol; Hydroxypropyloxypropanol
7th on the list, which puts it at an estimated 1–5% of the formula.
3-O-Ethyl Ascorbic Acid is the organic compound.
8th on the list, which puts it at an estimated 1–5% of the formula.
Bis-Ethoxydiglycol Cyclohexane Dicarboxylate
9th on the list, which puts it at an estimated 1–5% of the formula.
2,6,10,15,19,23-Hexamethyltetracosane
10th on the list, which puts it at an estimated 1–5% of the formula.
1H-Purine-2,6-dione, 3,7-dihydro-1,3,7-trimethyl-
11th on the list, which puts it at an estimated 1–3% of the formula.
Sodium chloride
12th on the list, which puts it at an estimated 1–3% of the formula.
Butanamide, 2,4-dihydroxy-N-(3-hydroxypropyl)-3,3-dimethyl-, (2R)-; dl-Panthenol
13th on the list, which puts it at an estimated 1–3% of the formula.
N-acetyl-.alpha.-D-glucosamine
14th on the list, which puts it at an estimated 1–3% of the formula.
Hyaluronic acid, sodium, salt
15th on the list, which puts it at an estimated 1–3% of the formula.
D-Glucono-1,5-lactone
16th on the list, which puts it at an estimated 1–3% of the formula.
Glycine, N-(N-L-.gamma.-glutamyl-L-cysteinyl)-
17th on the list, which puts it at an estimated 1–3% of the formula.
1,2-Dihydroxypentane
18th on the list, which puts it at an estimated 1–3% of the formula.
Osmanthus Fragrans Leaf Extract is the extract of the leaves of Osmanthus fragrans, Oleaceae.
19th on the list, which puts it at an estimated 1–3% of the formula.
L-ascorbic acid, tetraisohexadecanoate
20th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Xanthan gum
21st on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Sodium sulphite
22nd on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Disodium dihydrogen ethylenediaminetetraacetate
23rd on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Gardenia Florida Fruit Extract is an extract of the fruit of the Cape Jasmine, Gardenia Florida L., Rubiaceae
24th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
4-Hydroxy-3-methoxycinnamic acid
25th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Dextrin
26th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Achillea Millefolium Extract is an extract of the leaves and flowers of the yarrow, Achillea millefolium L., Asteraceae
27th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
3,4-Dihydro-2,5,7,8-tetramethyl-2-(4,8,12-trimethyltridecyl)-2H-benzopyran-6-ol; .alpha.-tocopherol; Vitamin E
28th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
L-Arginine
29th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Niacinamide (vitamin B3) is a gentle skincare active that repairs the skin barrier, calms redness, controls oil and evens tone at 2–5%. Official IUPAC name: **3-Pyridinecarboxamide**
30th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Glycyrrhiza Glabra Root Extract is an extract of the roots of the Licorice, Glycyrrhiza glabra L., Leguminosae
31st on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
1,1,1,3,5,5,5-Heptamethyl-3-(trimethylsilyloxy)trisiloxane
32nd on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Carthamus Tinctorius Seed Oil is the oily liquid obtained from the seeds of Safflower, Carthamus tinctorius L., Compositae. It consists principally of the triglycerides of linoleic acid
Products in the same category that share this formula's distinguishing ingredients.
COSRX
Shares 11 key ingredients with Vitamin C Expert 25% Antioxidant Toning Serum: Water, Ascorbic Acid, Butylene Glycol, 3-o-ethyl Ascorbic Acid, Panthenol
COSRX
Shares 11 key ingredients with Vitamin C Expert 25% Antioxidant Toning Serum: Water, Ascorbic Acid, Dimethicone, Panthenol, Squalane
ma:nyo
Shares 9 key ingredients with Vitamin C Expert 25% Antioxidant Toning Serum: Water, Niacinamide, Butylene Glycol, Glutathione, Acetyl Glucosamine
NEOGEN
Shares 8 key ingredients with Vitamin C Expert 25% Antioxidant Toning Serum: Water, Niacinamide, Butylene Glycol, Ascorbyl Tetraisopalmitate, Panthenol
innisfree
Shares 8 key ingredients with Vitamin C Expert 25% Antioxidant Toning Serum: 3-o-ethyl Ascorbic Acid, Butylene Glycol, Squalane, Gluconolactone, Panthenol
Numbuzin
Shares 8 key ingredients with Vitamin C Expert 25% Antioxidant Toning Serum: Water, Butylene Glycol, Niacinamide, Panthenol, 3-o-ethyl Ascorbic Acid
WATER, ASCORBIC ACID, TROMETHAMINE, DIMETHICONE, BUTYLENE GLYCOL, DIPROPYLENE GLYCOL, 3-O-ETHYL ASCORBIC ACID, BIS-ETHOXYDIGLYCOL CYCLOHEXANE 1,4-DICARBOXYLATE, SQUALANE, CAFFEINE, SODIUM CHLORIDE, PANTHENOL, ACETYL GLUCOSAMINE, SODIUM HYALURONATE, GLUCONOLACTONE, GLUTATHIONE, PENTYLENE GLYCOL, OSMANTHUS FRAGRANS LEAF EXTRACT, ASCORBYL TETRAISOPALMITATE, XANTHAN GUM, SODIUM SULFITE, DISODIUM EDTA, GARDENIA FLORIDA FRUIT EXTRACT, FERULIC ACID, DEXTRIN, ACHILLEA MILLEFOLIUM EXTRACT, TOCOPHEROL, ARGININE, NIACINAMIDE, GLYCYRRHIZA GLABRA ROOT EXTRACT, METHYL TRIMETHICONE, CARTHAMUS TINCTORIUS SEED OIL.
ASCORBIC ACID, 3-O-ETHYL ASCORBIC ACID, PANTHENOL, SODIUM HYALURONATE, GLUCONOLACTONE, ASCORBYL TETRAISOPALMITATE, NIACINAMIDE.
After cleansing and toning, smooth a couple drops of the serum all over your face, and let it absorb. To maintain the efficacy of this pure blend Vitamin C serum and delay oxidation, it is recommended to store it in a fridge.
Judged on how rich the formula reads from its ingredient list, it suits Balanced, Combination (oily), Oily skin best. It is the least natural fit for Dry, Combination (dry) skin.
No ingredient in this formula carries a common-irritant flag, making it a reasonable option for reactive skin. A patch test is still recommended, as individual skin reactivity varies.
2 ingredients could feed malassezia: Ascorbyl Tetraisopalmitate, Carthamus Tinctorius Seed Oil. That describes the yeast's food supply, not a prediction that they will cause a breakout.
Nothing in this formula is on the standard pregnancy-caution list. That is not medical clearance — check anything you use daily with your doctor or midwife.
Yes. Reading the full ingredient list, this formula is fragrance-free.
No. Reading the full ingredient list, this formula is no drying alcohol.
No — it contains Dimethicone, Methyl Trimethicone.
No. Reading the full ingredient list, this formula is essential-oil-free.
Yes. Reading the full ingredient list, this formula is paraben-free.
It layers well with Vitamin C (L-ascorbic acid), Azelaic acid, Copper peptides, Bakuchiol, Niacinamide, Hyaluronic acid. Take more care combining it with Retinoids (retinol, retinal), Benzoyl peroxide, AHAs (glycolic, lactic), BHA (salicylic acid), PHAs (gluconolactone) — use them in separate routines or on alternate days.
Use it morning and evening, after toner, before moisturiser.
It lists 32 ingredients, of which 7 are recorded as actives.
IOPE, a brand based in Korea.
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