The science
This is a humectant delivery sheet and its science is the science of humectants under brief occlusion. A 2024 study in the Journal of Tissue Viability measured stratum corneum changes across modes of sheet-mask use and confirmed a real short-term rise in hydration during the wet phase that reverses as a sheet dries; a thin daily sheet holds little essence and reaches that point within about ten minutes, which is why the wear is short and why the mechanism is daily repetition rather than any single wear. Glycerin, the most thoroughly evidenced humectant in dermatology, sits second; dipropylene glycol at third behaves similarly at the surface.
Hydroxyethyl urea at sixth is the ingredient that distinguishes the formula. Urea is a component of the skin's own natural moisturising factor with decades of evidence for hydrating and, at higher concentrations, keratolytic effects; hydroxyethyl urea is a derivative developed to deliver the water-binding without urea's crystallisation and sting, and it is used in leave-on moisturisers for that reason. Its presence high on a daily sheet gives the mask a more durable humectant effect than glycols alone, though without an occlusive layer none of it prevents the water from leaving.
Panthenol is declared at 1,000 ppm, and the literature sets that in context: a 2017 review in the Journal of Dermatological Treatment marking seventy years of topical dexpanthenol summarised barrier-repair, anti-irritant and wound-healing evidence at concentrations of one to five percent in leave-on products. At a tenth of a percent in a seven-minute sheet the ingredient is a soothing accent consistent with the calm after-feel, not a dose that carries those findings. The six hyaluronate forms, honestly totalled at about 130 ppm, span molecular weights from a surface-filming crosspolymer to small hydrolysed fragments; at that concentration they contribute a light film and modest water-holding at the surface, and the brand's decision to print the figures is more notable than the figures themselves. Allantoin is an established anti-irritant. Fragrance is the one ingredient with a documented downside, as the leading cause of cosmetic contact dermatitis in the sensitised minority, and daily whole-face use raises cumulative exposure.
References 2 ShowHide
- Short-term skin reactions and changes in stratum corneum following different ways of facial sheet mask usage — Journal of Tissue Viability (2024)
- Topical use of dexpanthenol: a 70th anniversary article — Journal of Dermatological Treatment (2017)