The science
A sheet mask works by occlusion and humectancy, and this one is a textbook example with an unusually well-documented label. The fibre sheet traps a film of essence against the stratum corneum for fifteen to twenty minutes, during which glycerin, butylene glycol, betaine and trehalose draw water into the outer layers and the hyaluronates, from high-molecular-weight crosspolymer to hydrolysed fragments, hold a hydrating film on the surface. The result, a measurable rise in corneometry readings and a visible plumping of fine dehydration lines, lasts hours and is the same regardless of what else is in the essence.
The claims with any longer horizon rest on two ingredients that Korea's Ministry of Food and Drug Safety recognises for functional-cosmetic registration: niacinamide at two percent for brightening and adenosine at 0.04 percent for wrinkle improvement. Farm Stay prints the niacinamide at 20,000 ppm and the product is registered as dual-functional, which confirms both are at the listed doses. Niacinamide at two to five percent has controlled-trial support for reducing melanosome transfer, improving barrier lipids and lowering transepidermal water loss over eight to twelve weeks of twice-daily application; the evidence for adenosine is thinner, a small number of trials showing modest wrinkle-depth improvement from daily leave-on use. Neither has been studied as an intermittent sheet-mask application, and the registration is a statement about ingredient content rather than an efficacy trial of this mask.
The ingredients on the front of the sachet are printed at concentrations where no mechanism applies. Polydeoxyribonucleotide has genuine evidence as an injected and wound-care agent acting through adenosine A2A receptors, at concentrations of milligrams per millilitre; sodium DNA at 0.1 ppm is seven orders of magnitude lower. Ascorbic acid at 1 ppm, sodium ascorbyl phosphate at 0.075 ppm and pyridoxine at 0.03 ppm are thousands of times below any studied dose. Tocopheryl acetate at 100 ppm is a minor antioxidant. Panax ginseng vesicles belong to the emerging literature on plant-derived extracellular vesicles, which has in-vitro results on fibroblasts and melanocytes and no controlled human evidence for a cosmetic at trace level. The brand cites a completed human low-irritation application test, which addresses tolerability rather than efficacy and is unpublished. Fragrance, at sixteenth, remains the ingredient of most clinical relevance for reactive skin.