Hyaluronic Acid Can Actually Dehydrate Your Skin (Here's When)
The internet's favorite hydrator has a counterintuitive dark side — in dry air, a humectant with nothing to seal it can pull water out of your skin instead of into it.
The real substance is an eight-form hyaluronic acid complex paired with high-placed niacinamide and adenosine, in a bouncy hydrogel sheet that adheres well and can double as an overnight mask layer. The '5 PDRN' name stacks the year's buzziest ingredient five ways, but the genuine plumping comes from that layered hyaluronic acid system.
A well-priced, genuinely hydrating hydrogel mask whose real substance is an eight-form hyaluronic acid complex, high-placed niacinamide, and adenosine. The '5 PDRN' headline is trend-driven marketing math, but the underlying formula is sound and the masks leave skin plump, dewy, and comfortable.
Note: This sheet mask was released in November 2025 and our assessment is based on limited real-world data. The score here leans on ingredient analysis, formulation quality, and COSRX's track record. The rating should firm up as user feedback keeps coming in.
The case for it
What would change this: A declared concentration would move this to a firmer reading of the dose.
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. Unchanged since September 5, 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: 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. Unchanged since September 5, 2026, engine 5.1.1.
Brand or formulator? Disclose a concentration or correct a fact →
The case for it
What would change this: A declared concentration would move this to a firmer reading of the dose.
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. Unchanged since September 5, 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
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. Unchanged since September 5, 2026, engine 5.1.1.
Brand or formulator? Disclose a concentration or correct a fact →
The studies behind the evidence row
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).
Where our review and the verdict differ. The review below was written on the formulation and the published trials; the verdicts above apply the stricter standing test in our methodology — an active earns a recommendation only with guideline or regulatory standing for the concern. Where the two disagree, the verdict is DermApproved’s position.
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
PDRN was 2025's loudest skincare buzzword, so COSRX did the obvious thing and stamped it across this mask's name five times over. The COSRX 5 PDRN Hyaluronic Acid Vital Hydrating Hydrogel Mask is a clean example of marketing by multiplication, the logic that if one buzzword sells, five must sell harder. Polydeoxyribonucleotide, PDRN, dominated the conversation that year, and the brand's response was not to use PDRN once but to construct a whole sub-line around "5 PDRN," a complex it says draws on five sources: salmon, centella, rice, lactobacillus and sea grapes. Five PDRNs. The name does a great deal of work, which makes separating the name from the mask the first honest job here.
Worth understanding precisely is what "5 PDRN" actually means, because it is easy to misread. The 5 is not five times the strength or five times the regeneration. It is five claimed source materials grouped under one marketing umbrella. On the real ingredient list, the PDRN-related ingredients appear as Sodium DNA and Hydrolyzed DNA, nucleotide ingredients. The context that matters: the PDRN that earned the buzzword its reputation is a specific salmon-derived polynucleotide used in injectable aesthetic treatments, where its regenerative effects are genuine and studied. Topical nucleotide ingredients, sitting in a hydrogel mask for twenty minutes, are a different proposition. They function as water-binding skin conditioners. They are not bad, they are simply not the regenerative powerhouse the word PDRN has been trained to promise. Multiply that by five and you still have a hydrating conditioner, not a treatment.
Set the name aside, though, and the mask underneath is genuinely decent. The real substance here is hydration, and it is delivered properly. The headline COSRX ironically undersells is the eight types of hyaluronic acid, and that part is real and well-considered. The INCI lists eight distinct hyaluronic acid forms: standard sodium hyaluronate, hydrolyzed versions, a crosspolymer, an acetylated form, potassium hyaluronate and more. These sit at different molecular weights, and that range lets the mask hydrate multiple depths of the upper skin at once rather than just coating the surface. This layered HA system is what genuinely produces the plumped, dewy, glass-skin look the mask delivers. To know why this mask works, look at the hyaluronic acid, not the PDRN.
Around it, the supporting cast is sensible too. Sitting fourth on the ingredient list, a notably high placement for a sheet mask, niacinamide offers real barrier support and gradual tone-evening. A South Korean-approved functional anti-wrinkle ingredient, adenosine, backs the mask's lifting claims with more evidence than the headline does. Centella asiatica, coptis root and allantoin keep it soothing. A small peptide and alpha-arbutin appear near the end of the list, minor inclusions but on-theme. For an affordable hydrogel mask, this is a thoughtfully populated formula.
This mask is a pleasure to wear. It is a firm, bouncy hydrogel sheet, the kind that holds its shape and grips the contours of the face rather than sliding toward your jaw the moment you move. It is saturated in a clear, lightly viscous essence, and it has a satisfying detail, turning more transparent as it releases its actives, which gives you a visual cue. Neither scent nor sting registers. After twenty to thirty minutes, skin looks visibly plumper, dewier and smoother. COSRX also designed it to be wearable overnight, so it can double as a longer sleeping-mask layer if you want to extend the effect.
The honest framing, true of every sheet mask rather than a knock specific to this one, is that the result is a temporary hydration boost. Skin looks plump because it is hydrated; fine lines look softer because they are hydrated. That is real and worth having, especially before an event or after a dehydrating flight, but it is not cumulative treatment. A package contains three single-use masks. These are an occasional treat rather than a daily regimen, and the lifting and wrinkle language should be read as describing the immediate, temporary look rather than a lasting structural change. Lasting wrinkle improvement comes from consistent proven actives over months, not from sheet masks.
On value, the mask is well priced. Around fifteen dollars for a three-sheet package places it comfortably in affordable territory for a multi-active hydrogel mask, in keeping with COSRX's accessible house style. Hydrogel masks generally cost more than basic cotton sheet masks, and this one earns the small premium with its genuine HA complex and bouncy, well-adhering sheet. It is not an everyday product, so a three-pack lasts a while as the occasional treat it is meant to be.
Ignore the multiplication. The "5 PDRN" name is marketing doing what marketing does, and the nucleotide ingredients it points to are minor conditioners, not the regenerative story the word implies. Underneath the name, though, is a genuinely good, affordable hydrating hydrogel mask: a real eight-form hyaluronic acid complex, sensible niacinamide and adenosine support, a comfortable bouncy sheet, and a reliable plump-and-glow payoff. Bought as what it is, a pleasant hydration treat for dull or dehydrated skin, and it delivers honestly. Buy it expecting five-fold regeneration, and the name will have done its job on you.
The hero actives that drive this product's performance.
| Ingredient | Function | Evidence |
|---|---|---|
| 5 PDRN Complex (Sodium DNA, Hydrolyzed DNA) | COSRX's take on the PDRN trend, marketed as drawing on five sources — salmon, centella, rice, lactobacillus, and sea grapes — and appearing on the INCI as Sodium DNA and Hydrolyzed DNA. In a hydrogel mask worn briefly, these nucleotide ingredients act mainly as water-binding skin conditioners, contributing to the plumped look rather than the regenerative effect of injected clinical PDRN. | Not yet assessed |
| 8-Type Hyaluronic Acid Complex | The mask layers eight forms of hyaluronic acid — standard, hydrolyzed, crosspolymer, acetylated, and potassium variants among them — at different molecular weights. This range hydrates several depths of the upper skin at once, and it is the genuine engine behind the mask's plumping, glass-skin effect. | Established mechanism for Dehydration · established mechanism |
| Niacinamide | Placed fourth on the INCI, a high position for a sheet mask, niacinamide supports the barrier and lends a gradual tone-evening benefit. It is the mask's most credible brightening active across repeated use. | Established mechanism for Compromised Skin Barrier · established mechanism |
| Adenosine | A South Korean–approved functional anti-wrinkle ingredient. It backs the mask's lifting and wrinkle claims with more evidence than the headline PDRN, supporting smoother-looking skin during and after the treatment. | Not yet assessed |
| Centella Asiatica Extract | A soothing botanical that keeps the mask calming and comfortable during its contact time, complementing the coptis japonica root extract and allantoin in settling reactive skin. | Not yet assessed |
| Acetyl Hexapeptide-8 | A signaling peptide included near the end of the formula to support the lifting and smoothing claims. At its low placement it is a modest finishing touch rather than a powerhouse active. | Not yet assessed |
Ingredient standings describe the active at treatment-level doses and vehicles; this product's own condition grades weigh its actual formula.
Aqua/Water, Glycerin, Acrylates Copolymer, Niacinamide, 1,2-Hexanediol, Ceratonia Siliqua (Carob) Gum, Chondrus Crispus, Agar, Sclerotium Gum, Potassium Chloride, Sucrose, Butylene Glycol, Sodium Hyaluronate, Cellulose Gum, Polyglyceryl-10 Laurate, Panthenol, Allantoin, Xanthan Gum, Ethylhexylglycerin, Adenosine, Coptis Japonica Root Extract, Sodium Phytate, Sodium DNA, Alpha-Arbutin, Cyanocobalamin, Lactobacillus Ferment, Hydrolyzed Collagen, Centella Asiatica Extract, Caprylyl Glycol, Hydroxypropyltrimonium Hyaluronate, Hydrolyzed Hyaluronic Acid, Hydrolyzed Sodium Hyaluronate, Hyaluronic Acid, Potassium Hyaluronate, Sodium Hyaluronate Crosspolymer, Tocopherol, Acetyl Hexapeptide-8, Propanediol, Pentylene Glycol, Sodium Acetylated Hyaluronate, Hydrolyzed DNA
treatment
AM & PM
Apply to clean skin after toner, before serum and moisturizer. Leave the hydrogel mask on for 20-30 minutes — or, since it is designed to be worn overnight, as a sleeping mask layer — then pat in the remaining essence rather than wiping it off. Follow with a moisturizer to seal the hydration in.
Skin looks plumped, dewy, and smoother immediately after wear. The effect is a temporary hydration boost; using the mask regularly supports a more consistently hydrated, comfortable complexion, but the masks are an occasional treat rather than a cumulative treatment.
The mask's genuine hydration credentials rest on its hyaluronic acid system. Topical hyaluronic acid is a thoroughly studied humectant, and the rationale for using multiple molecular weights is sound: higher-molecular-weight forms hydrate and film-form at the surface, while lower-molecular-weight and hydrolyzed fragments distribute into the upper layers of the stratum corneum. A blend of eight forms, as used here, hydrates more completely than a single form, which is the basis of the mask's plumping effect. Glycerin near the top of the list reinforces this with broad humectancy.
Niacinamide is the best-evidenced of the more targeted ingredients, with well-documented effects on barrier function and on reducing the appearance of hyperpigmentation. Adenosine is a South Korean-approved functional anti-wrinkle ingredient with documented effects on the appearance of fine lines. Centella asiatica has a substantial literature for anti-inflammatory and soothing activity.
The headline ingredients warrant a precise read. PDRN, polydeoxyribonucleotide, has a clinical evidence base in its salmon-derived, injectable form for tissue regeneration. The mask lists Sodium DNA and Hydrolyzed DNA, topical nucleotide ingredients that do not carry comparable evidence for regeneration when applied briefly in a leave-on or wear-off mask; their realistic role is as humectant skin conditioners. The "5 PDRN" designation refers to source materials, not to a fivefold increase in efficacy. In short, this is a well-built hydrating mask whose plumping and smoothing results are real and explained primarily by its hyaluronic acid and humectant content, with the PDRN branding contributing little measurable beyond marketing appeal.
Dermatologists generally regard hydrogel and sheet masks as pleasant, low-risk additions to a routine rather than treatments, and tend to frame their plumping effect as a short-term consequence of hydration rather than a lasting structural change. The eight-form hyaluronic acid complex and niacinamide content here align with ingredients clinicians consider genuinely effective for hydration and barrier support. On the PDRN branding, the clinical view is consistently measured: the regenerative PDRN studied in dermatology is a salmon-derived, typically injected polynucleotide, and a topical nucleotide ingredient in a brief-contact mask should not be expected to replicate those results. With a fragrance-free, soothing formula and no retinoids or acids, the mask is the kind of low-risk product generally considered fine for sensitive skin and during pregnancy. It is best understood as an occasional hydration treat that supports, rather than replaces, a consistent daily routine.
After cleansing and toner, lay the hydrogel mask over the face, smoothing it to follow the contours so it sits flush with no air gaps. Leave it on for 20 to 30 minutes, watching the mask turn more transparent as it releases its essence, then remove it and gently pat any remaining essence into the skin rather than wiping it off. Seal everything in with a moisturizer afterward. For an extended treatment the mask can be worn longer, overnight, as a sleeping-mask layer. Use it as an occasional treat rather than a daily step, since a package holds only three single-use sheets, and chilling the mask in the fridge beforehand adds a pleasant depuffing effect.
At around $15 for a three-sheet package, this hydrogel mask is fairly priced and sits comfortably in affordable territory for a multi-active hydrogel sheet — hydrogel masks generally cost more than basic cotton sheet masks, and this one earns the modest premium with a genuine eight-form hyaluronic acid complex and a well-adhering, bouncy sheet. It is consistent with COSRX's accessible, value-focused house style. Because sheet masks are an occasional-use product rather than a daily one, a three-pack lasts a reasonable while. The honest caveat is that part of the appeal you are paying attention to — the '5 PDRN' name — adds little measurable to the result; judged on the hydrating experience the mask actually delivers, the value is solid.
Reach for this when you want an affordable, genuinely hydrating hydrogel mask for an occasional plump-and-glow boost, before an event, after travel, or whenever skin reads dull and dehydrated. It serves dry, normal and combination skin well, and the unscented, soothing formula keeps it comfortable for sensitive skin too.
Anyone expecting the regenerative results associated with clinical PDRN, or lasting lifting and wrinkle reduction, will be disappointed — this is a temporary hydration treat. Those who want a cumulative anti-aging treatment should invest in proven daily actives instead. Fungal-acne-prone users should patch test, given the polyglyceryl ester content.
Ready to try COSRX 5 PDRN Hyaluronic Acid Vital Hydrating Hydrogel Mask?
Buy at Amazon ♥A firm, bouncy hydrogel sheet saturated in a clear, lightly viscous essence that grips the contours of the face and turns more transparent as it releases its actives
Effectively scentless; only a trace of a neutral base note on application.
Individually sealed hydrogel sheet masks, sold in single sheets or a 3-sheet package. The sealed sheets are hygienic and travel-friendly.
Expect a cool, slightly tightening sensation as the bouncy hydrogel settles against the skin. There is no scent or sting. After 20-30 minutes the skin looks visibly plumper, dewier, and smoother — an immediate, satisfying, if temporary, payoff with no adjustment period.
3 single-use masks per package — used as an occasional treat rather than daily
All Year
PDRN — polydeoxyribonucleotide — became K-beauty's defining buzzword in 2024 and 2025, and COSRX answered with a '5 PDRN' line that multiplies the term across five claimed sources. This hydrogel mask, launched in late 2025, folds that on-trend naming into COSRX's affordable, accessible house style, pairing it with the brand's familiar reliance on hyaluronic acid for hydration.
COSRX was founded in 2013 in Seoul and became a subsidiary of Amorepacific in 2023. The brand built its reputation on minimal-ingredient, effective formulations and is one of the most widely recommended K-beauty brands globally, though its products are not backed by proprietary clinical research in the way pharmaceutical brands are.
A '5 PDRN' mask delivers five times the regenerative power of a regular PDRN product.
The '5' refers to five claimed source materials, not five times the potency. Clinical PDRN is a salmon-derived polynucleotide used in injectable treatments; the nucleotide ingredients in a brief-wear hydrogel mask act as water-binding conditioners. The mask hydrates and plumps well — but not through regeneration.
A hydrogel mask gives long-lasting lifting and wrinkle reduction.
The plumping and smoothing a hydrogel mask provides is a temporary hydration effect. Fine lines look softer because they are hydrated. Lasting wrinkle improvement requires consistent use of proven actives over months, not an occasional sheet mask.
It refers to five claimed source materials COSRX groups under its PDRN branding — salmon, centella, rice, lactobacillus, and sea grapes — with nucleotide ingredients appearing on the INCI as Sodium DNA and Hydrolyzed DNA. In a brief-wear hydrogel mask, these act as water-binding skin conditioners rather than the regenerative ingredient that clinical, injectable PDRN is.
It is a hydrating hydrogel sheet mask. Its real strength is an eight-form hyaluronic acid complex that plumps and hydrates the skin, supported by niacinamide for tone and adenosine for the appearance of fine lines. Skin looks dewy, plump, and smoother right after use — a temporary but satisfying hydration boost.
Leave it on for 20-30 minutes, then pat in any remaining essence rather than wiping it off. Because it is designed to be wearable overnight, it can also be used as a longer sleeping-mask layer. Follow with a moisturizer to seal the hydration in.
Yes. The formula is fragrance-free, alcohol-free, and includes soothing centella, allantoin, and coptis japonica root extract. There are no high-risk sensitizers, making it a comfortable option for most sensitive skin, though a patch test is always sensible.
No. The plumping and smoothing effect is temporary, driven by hydration. Fine lines look softer because they are hydrated. Lasting improvement in wrinkles requires consistent use of proven actives like retinoids over months — a hydrogel mask is an occasional hydration treat, not an anti-aging treatment.
Not fully. The formula contains polyglyceryl-10 laurate, which can feed the malassezia yeast linked to fungal acne. Those managing fungal acne should patch test, though as a rinse-adjacent, brief-wear mask the contact time is limited.
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 plump and dewy straight after use
Hydrogel sheet adheres well without sliding around
Fragrance-free formula feels comfortable on sensitive skin
Affordable for a multi-active hydrogel mask
The '5 PDRN' claim feels more like marketing than substance
Effects are a temporary hydration boost, not lasting
Hydrogel sheets can be tricky to position at first
Too few reviews yet to judge the lifting claims