A sheet mask that prints its concentrations and thereby shows both its strength and its decoration: a full five percent niacinamide, fourteen percent sea buckthorn water, and a vitamin C ester at 1.5 ppm beside undisclosed tranexamic acid and glutathione, in a fragrance-free, oil-free essence with bisabolol and allantoin. Most masks hide their doses; this one hands you the calculation.
A fragrance-free hydrating sheet with one thing most masks lack, a genuine five percent niacinamide, and a pouch full of names the label's own numbers deflate: vitamin C at 1.5 ppm, tranexamic acid and glutathione undisclosed below the preservatives. It plumps and brightens for a day, may nudge tone a little over months of twice-weekly use, and fades no spot on its own. Honest in its printing, oversold in its title, and fair at $5.30 as the boost beside a daily serum.
About a year and a half on sale with no reviews of the mask on the brand's US site yet, an unverified count on Amazon and YesStyle, and no published test; the assessment rests on the concentrations the brand prints, on niacinamide's evidence at five percent and on the well-understood behaviour of occluded humectant sheets. The brightening claims beyond niacinamide are assessed against the label's own numbers.
The case for it
What would change this: A researched evidence row for the lead active would replace this with a verdict.
Same rule for everyone. “Supporting role” is the verdict on 8,197 of 45,024 concern verdicts across the catalog; rule R8 decided 4,250 of them. As of September 25, 2026, engine 5.1.1.
Brand or formulator? Disclose a concentration or correct a fact →
The case for it
Same rule for everyone. “Good choice” is the verdict on 9,564 of 45,024 concern verdicts across the catalog; rule R5 decided 9,072 of them. As of September 25, 2026, engine 5.1.1.
Brand or formulator? Disclose a concentration or correct a fact →
The studies behind the evidence row
The case for it
What would change this: Guideline or regulatory standing for the active on this concern would move this from a promising bet to a recommendation.
Same rule for everyone. “Promising” is the verdict on 7,858 of 45,024 concern verdicts across the catalog; rule R9p decided 7,858 of them. As of September 25, 2026, engine 5.1.1.
Brand or formulator? Disclose a concentration or correct a fact →
The studies behind the evidence row
Also listed for Dullness — the actives here (sea buckthorn extract, Niacinamide, Tranexamic Acid, Glutathione) are in our research queue for that concern; there is no verdict until their evidence rows are written. That is a gap in our table, not a mark against the product.
As a maskNot judged: what a mask is for — works within its wear time, benefit outlasts the mask, comes off cleanly — cannot yet be measured from the ingredient list (only intensity without injury can).
A verdict is DermApproved’s assessment of how well a product’s ingredients fit a concern — never a claim about what the product treats. Evidence dots and collected reviews sit beside it and are never blended in. Rules 0.5.1 · evidence table ev-2026.09-r228 · how we decide
ROUND LAB prints concentrations on its labels, and the Vita Niacinamide Dark Spot Serum Mask is the clearest case yet of why that habit is worth more than any marketing claim: it lets the pouch contradict itself in public. Niacinamide, 50,000 ppm, a full five percent, the dose the pigmentation studies used and an unusually serious amount for a sheet mask. Sea buckthorn water, 146,248 ppm, fourteen percent, the Vita of the line. And 3-O-ethyl ascorbic acid, 1.5 ppm, fifteen ten-thousandths of a percent, the vitamin C that the Triple Vita Activer complex is named for. Tranexamic acid and glutathione, the two dark-spot ingredients on the front of the pouch, carry no figure at all on a label that prints one for the panthenol, which is itself at 10 ppm; they sit thirteenth and fourteenth, below the preservatives. Read that way, the mask is a five percent niacinamide sheet in a sea buckthorn water, with a set of brightening names attached at doses that range from trace to nothing. Read that way, it is also a better mask than most.
The five percent is the reason. Niacinamide at that concentration has controlled evidence for reducing melanosome transfer to keratinocytes and for improving hyperpigmentation and yellowing over eight to twelve weeks of daily leave-on use, and it is also a humectant and a barrier lipid stimulant; most sheet masks that put the word on the pouch carry a fraction of it, and this one carries the working dose. Under fifteen to twenty minutes of occlusion it penetrates well, and it is joined by betaine and arginine as humectants, allantoin and bisabolol as calmers, adenosine for the label, gluconolactone and a trace of LHA for the line's vocabulary, and a Coptis root extract for antioxidant colour. The essence is fragrance-free, oil-free, alcohol-free and silicone-free, thin enough to drip and cool on the skin, and the sheet is a close-fitting cellulose that most owners find comfortable. The face comes out plumper, dewier and brighter-looking, which is the humectant occlusion any good mask delivers and lasts a day; on very reactive skin five percent niacinamide under a sheet can bring a flush, which passes within the hour and is worth a patch test on a rosacea-prone face before committing to a box. There are no reviews of the mask yet on the brand's US site and only an unverified crowd at Amazon and YesStyle, whose notes are the predictable pair: brighter for a day, spots the same.
The spots being the same is what the label predicts. A sheet mask is a twenty-minute, twice-weekly product, and pigmentation is a months-long, daily one; the niacinamide dose here could contribute modestly to evening tone over a season of regular use, and that is the ceiling. The vitamin C at 1.5 ppm is a name. Tranexamic acid, which has genuine melasma evidence at two to five percent in daily leave-on use, is present at an undisclosed trace in the wrong format; glutathione's brightening reputation comes from oral and injected use and has thin topical evidence at any dose. The brand's serum and cream in the same line are where the daily work happens, and the mask is honestly positioned by the brand as the boost beside them, which is the right reading and not the one the title suggests.
The practical rules are ordinary. Fifteen to twenty minutes on cleansed, toned skin, off before the sheet dries, essence patted in, moisturiser over; twice a week at most; not in the same session as an acid or a retinoid on reactive skin; and sunscreen every morning, without which no spot on earth fades. A leave-on niacinamide, tranexamic, azelaic or retinoid serum used daily does the sustained job, and the mask is the pleasant night before an event.
The price is fair for what it carries. Five dollars thirty a sheet, and the same per sheet in the five- and ten-packs, puts it at the upper-middle of Korean sheet masks, above the two-dollar sheets and below the prestige ones; twice a week from the ten-pack costs about $10 a week. What the price buys is a five percent niacinamide dose that cheaper masks do not have, a fragrance-free essence and a day of glow, which is good value as an occasional brightener; what it does not buy is the dark-spot treatment in the name, which no mask sells at any price.
So: if you use a daily brightening serum and want a fragrance-free sheet with a real niacinamide dose for the nights your skin looks tired, this is one of the better ones at the price and the printed label tells you exactly what you are getting. If you bought it to fade dark spots on its own, the label also tells you that it will not, in numbers small enough to need a magnifying glass and honest enough to deserve one.
The hero actives that drive this product's performance.
| Ingredient | Function | Evidence |
|---|---|---|
| Niacinamide (5%) | Fourth on the list at a declared 50,000 ppm, a full five percent, which is the dose the pigmentation studies used and an unusually honest amount for a sheet mask; under twenty minutes of occlusion it is the one ingredient in the essence with a plausible claim on melanosome transfer, and it is the whole of the dark-spot case. | Emerging for Hyperpigmentation |
| Hippophae Rhamnoides Water and Fruit Extract (14.6% and 0.075%) | Second and tenth, sea buckthorn water at a declared 146,248 ppm and fruit extract at 750 ppm, the Vita of the line's name: a vitamin-rich botanical water with antioxidant data that carries the brightening story and, at fourteen percent, a good share of the mask's hydration; its vitamin C content is the marketing, not a dose. | Not yet assessed |
| Tranexamic Acid | Thirteenth, undisclosed, the plasmin inhibitor with genuine melasma evidence at two to five percent in leave-on use; here it sits below the preservatives and carries no printed figure, which on a label that prints figures for everything else tells you it is a trace, and a twenty-minute mask is the wrong format for it anyway. | Limited for Hyperpigmentation |
| 3-O-Ethyl Ascorbic Acid and Sodium Ascorbyl Phosphate (0.00015%) | Twentieth and nineteenth, two vitamin C derivatives, the ethyl form declared at 1.5 ppm, which is fifteen ten-thousandths of a percent and the smallest number on the label; the Triple Vita Activer complex the brand names it in is sea buckthorn water plus a vitamin C at a dose that cannot do anything, and the label says so in its own numbers. | Not yet assessed |
| Glutathione | Fourteenth, undisclosed, the antioxidant tripeptide that Asian brightening lines list for its reputation from oral and injected use; topically it penetrates poorly and has thin evidence, and at a trace in a sheet mask it is a name on the pouch. | Not yet assessed |
| Bisabolol and Allantoin | Fifteenth and ninth, the two soothing agents that with betaine and arginine keep a five percent niacinamide essence comfortable under occlusion; panthenol, declared at 10 ppm, is on the front of the pouch and is a trace, and these two are the calming that actually works. | Not yet assessed |
Ingredient standings describe the active at treatment-level doses and vehicles; this product's own condition grades weigh its actual formula.
Water, Hippophae Rhamnoides Water (146,248 ppm), Butylene Glycol, Niacinamide (50,000 ppm), Betaine, 1,2-Hexanediol, Polyglycerin-3, Arginine, Allantoin, Hippophae Rhamnoides Fruit Extract (750 ppm), Ethylhexylglycerin, Adenosine, Tranexamic Acid, Glutathione, Bisabolol, Gluconolactone, Capryloyl Salicylic Acid, Panthenol (10 ppm), Sodium Ascorbyl Phosphate, 3-O-Ethyl Ascorbic Acid (1.5 ppm), Coptis Japonica Root Extract, Hydrogenated Lecithin, Carbomer, Disodium EDTA
treatment
AM & PM
On cleansed, toned skin for fifteen to twenty minutes, then pat the essence in and moisturise; it fits twice a week between a nightly niacinamide or tranexamic serum, which is where the real spot work happens, and it should not follow an acid or retinoid in the same session on reactive skin.
Immediate: hydrated, plumper, brighter-looking skin on removal that lasts a day, which is any humectant sheet mask. A five percent niacinamide dose used twice a week over eight to twelve weeks may contribute modestly to evening tone; dark spots do not fade from an occasional mask, and the vitamin C, tranexamic acid and glutathione are at doses that add nothing.
A sheet mask acts by occlusion and humectancy, and this one adds a single active at a meaningful dose. Niacinamide at 50,000 ppm, five percent, is the concentration at which controlled studies have shown reduced melanosome transfer from melanocytes to keratinocytes, improvement in hyperpigmentation and sallowness over eight to twelve weeks of daily application, increased ceramide synthesis and reduced transepidermal water loss; under fifteen to twenty minutes of occlusion it penetrates well, though the evidence base is for daily leave-on use and a twice-weekly mask should be expected to contribute modestly at best. Hippophae rhamnoides water at 146,248 ppm and fruit extract at 750 ppm supply flavonoids, carotenoids and vitamins with in-vitro antioxidant data and function chiefly as a humectant water phase; the fruit's vitamin C content does not translate into a declared ascorbic dose. Betaine and arginine are humectants; allantoin and bisabolol have documented soothing and anti-irritant effects; adenosine has modest leave-on wrinkle data; gluconolactone is a humectant polyhydroxy acid; capryloyl salicylic acid at a trace does not exfoliate in twenty minutes; Coptis japonica root extract contributes berberine with laboratory anti-inflammatory data.
The brightening decoration is measurable from the label. 3-O-ethyl ascorbic acid is declared at 1.5 ppm, four orders of magnitude below the one to three percent at which vitamin C derivatives have any evidence, and sodium ascorbyl phosphate is undisclosed at nineteenth; together they cannot contribute. Tranexamic acid has clinical evidence for melasma at two to five percent in daily leave-on use over months and is undisclosed here at thirteenth position below the preservatives, consistent with a trace; glutathione has thin topical evidence at any concentration owing to poor penetration and instability, and its brightening reputation derives from oral and intravenous use. Panthenol is declared at 10 ppm, a trace despite its place on the pouch.
Tolerability is good: no fragrance, essential oils, alcohol, oils or silicones, a mild preservation system of 1,2-hexanediol and ethylhexylglycerin. Five percent niacinamide under occlusion can produce transient flushing in a minority, particularly on rosacea-prone skin. The ingredient list poses no known concern during pregnancy.
Dermatologists would view this as a hydrating sheet mask distinguished by a genuine five percent niacinamide dose, and would separate that from the rest of its brightening vocabulary. Niacinamide at five percent has controlled evidence for hyperpigmentation with daily leave-on use over two to three months, so a twice-weekly mask would be regarded as a reasonable adjunct that may contribute modestly and not as a treatment; the tranexamic acid, glutathione and vitamin C on the pouch would be dismissed on the basis of the brand's own printed concentrations and the format. For dark spots and melasma the evidence-based advice remains daily broad-spectrum sunscreen with a leave-on agent, niacinamide, tranexamic acid, azelaic acid, a retinoid or, under supervision, hydroquinone, applied consistently; the mask can be the occasional boost beside that. Clinicians would note the mask's clean tolerability profile, the possibility of transient flushing from five percent niacinamide under occlusion on rosacea-prone skin, and the standard advice to remove a sheet before it dries. Post-inflammatory hyperpigmentation patients would be reminded that the mask does nothing without sun protection.
After cleansing and toner, open the pouch over a sink, lift the sheet with its mesh backing, peel the backing away and lay the sheet from the forehead down, matching the eye, nose and mouth openings and pressing the edges flat. Leave it on for fifteen to twenty minutes and remove it before it begins to dry, then pat the remaining essence into the face and neck and follow with moisturiser and, in the morning, sunscreen. Use it up to twice a week between a daily leave-on brightening serum, which does the sustained work, and skip acids and retinoids in the same session on reactive skin; rosacea-prone skin should test a corner first, since five percent niacinamide under occlusion can flush. Store unopened pouches cool and use within two years.
At $5.30 a sheet, and the same per sheet in the five-pack at $26.50 and ten-pack at $53.30, the Vita Niacinamide mask sits at the upper-middle of Korean sheet masks, above the two-dollar hydrating sheets and below prestige masks, and twice-weekly use from the ten-pack costs about $10 a week for a day of brightness per session and, at most, a modest contribution to tone over months. The five percent niacinamide is the value, since cheaper masks that name the ingredient rarely carry the dose, and the fragrance-free essence and printed label justify the middle of the range; the vitamin C, tranexamic acid and glutathione cannot be priced because they are not present in useful amounts. As an occasional boost beside a daily brightening serum it is fair value; as a dark-spot treatment in itself it is money that belongs in a serum and a sunscreen. Buy a single before a box, since five percent niacinamide under a sheet is not for every face.
People with normal, combination, oily or dry skin who already use a daily brightening serum and want a fragrance-free, oil-free sheet with a real five percent niacinamide dose as an occasional boost for dull or tired-looking skin, and who read the printed label as the honest account of what the mask contains.
Anyone expecting a sheet mask to fade dark spots or melasma on its own, which none does; rosacea-prone or very reactive skin that flushes with five percent niacinamide under occlusion, at least without a patch test; buyers drawn by the vitamin C, tranexamic acid or glutathione, which the label prints or omits at trace levels; and anyone using masks as a substitute for a daily serum and sunscreen.
Ready to try ROUND LAB Vita Niacinamide Dark Spot Serum Mask?
Buy at Amazon ♥A thin, soft cellulose sheet soaked in a watery, faintly orange essence that clings closely, feels cool and slightly slippery, and leaves a light, dewy, non-tacky film on removal.
None; unscented, with a faint fruity note from the sea buckthorn water in the pouch that vanishes on the skin.
A yellow foil pouch with the Vita line's sea-buckthorn-field illustration holding one sheet on a mesh backing in 20 mL of essence; sold singly or boxed in fives and tens, with the pouch not recyclable in most schemes.
The first sheet is cool, thin and close-fitting, with a faint fruit note and no sting even at five percent niacinamide for most faces, and skin comes out plumper and visibly brighter in the way hydrated skin is; a slight flush on very reactive skin is possible. The brightness lasts a day and the spots are unchanged, which is what the label's own numbers predict.
One use per sheet; the five-pack covers two to three weeks at twice-weekly use.
All Year
ROUND LAB's Vita Niacinamide line launched in February 2025 as the brand's brightening range, built on sea buckthorn from Korea's east coast in the same regional-botanical spirit as the Dokdo, Birch and Pine lines, with a serum, a cream and this mask arriving together. The mask was positioned as the occasional boost to the daily serum, in the Korean tradition of a sheet for the night before an event, and it sits in the brand's sheet-mask range beside the Dokdo, Birch, Mugwort and Pine sheets.
ROUND LAB launched in 2017 on regionally sourced Korean botanicals and built the 1025 Dokdo and Birch Juice lines into Amazon bestsellers; the Vita Niacinamide line, its brightening range built on Korean sea buckthorn, arrived in 2025 with a serum, a cream and this sheet mask. The brand prints ingredient concentrations on the label, which is rare and useful, and publishes no clinical testing of the mask.
The Triple Vita Activer complex delivers a vitamin C brightening treatment.
The complex is sea buckthorn water at fourteen percent, sea buckthorn extract at 750 ppm and 3-O-ethyl ascorbic acid at 1.5 ppm, per the label; the vitamin C is present at fifteen ten-thousandths of a percent, which is a name on the pouch rather than a dose. The active that can affect tone is the five percent niacinamide, and it is the one worth buying the mask for.
Tranexamic acid and glutathione in a mask fade melasma and dark spots.
Tranexamic acid has real leave-on evidence at two to five percent over months; here it is undisclosed on a label that prints figures for everything else, placed below the preservatives, in a twenty-minute occasional mask. Glutathione's brightening reputation comes from oral and injected use and has thin topical evidence. Neither will fade a spot from a sheet.
Five percent, printed on the label as 50,000 ppm, which is the concentration used in the pigmentation studies and more than most sheet masks carry. It is the mask's one active at a working dose; the vitamin C ester is printed at 1.5 ppm and the tranexamic acid and glutathione are undisclosed traces.
Not on its own. A five percent niacinamide sheet used twice a week may contribute modestly to evening tone over two or three months, and it brightens the look of skin for a day through hydration; actual spot fading needs a daily leave-on niacinamide, tranexamic, azelaic or retinoid product and sunscreen, with the mask as an occasional boost.
It is fragrance-free, oil-free and alcohol-free with bisabolol and allantoin, which helps, but five percent niacinamide under twenty minutes of occlusion can flush very reactive skin, and a trace of LHA sits low on the list. Most sensitive skin tolerates it; rosacea-prone skin should test a corner first.
Sea buckthorn water at 146,248 ppm, about fourteen percent, sea buckthorn fruit extract at 750 ppm and 3-O-ethyl ascorbic acid at 1.5 ppm, per the printed label. It is a vitamin-rich botanical water with a vitamin C ester at a dose that is a name rather than an amount.
Twice a week is plenty; leave it on fifteen to twenty minutes and remove it before the sheet dries, then pat the essence in and moisturise. Keep it away from an acid or retinoid in the same session on reactive skin, and use a daily serum for the sustained work.
At the upper-middle of Korean sheet masks, and the same per sheet in the ten-pack, it buys a genuine five percent niacinamide dose that cheaper masks do not carry, a fragrance-free essence and a day of brightness. It is worth it as an occasional boost beside a daily serum; as a dark-spot treatment on its own, no mask is.
Recurring themes our editors read across retailer reviews of this product — summaries in our words, not quotations, and not a substitute for your own patch test.
Skin looks brighter and plumper on removal
No scent, no sting
Thin sheet that fits well
No change in actual dark spots
Essence is thin and drips
Pricier than most Korean sheet masks