FlashMasque Hydrate 5 Minute Sheet Mask

The base most products are built on. It carries the other ingredients and has no safety concern.

A humectant that draws water into the skin. One of the best-studied, best-tolerated ingredients in personal care.

A light, low-odor glycol used as a solvent and humectant, extremely common in Korean toners and essences. It has a low reported irritation rate and is graded low concern in published assessments.

A disaccharide sugar that acts as a humectant, drawing moisture into the skin and helping prevent dryness. It is well tolerated and commonly found in skincare formulas designed to support skin barrier health.

A humectant naturally derived from sugar beets that helps skin draw in and hold water; it has a long history of safe use with no meaningful irritation or sensitization concerns.

A soothing humectant that helps skin and hair look conditioned. Very well tolerated.

A glycerin derivative used as a skin conditioner and preservative booster, often paired with phenoxyethanol to allow lower total preservative levels. It has a low irritation and sensitization profile in safety reviews.

A more stable, esterified form of vitamin E used as an antioxidant and skin-conditioning ingredient. It is a different substance from the vitamin E acetate implicated in vaping-related lung injury, which involved inhaling the oil, not applying it topically to skin.

A lightweight humectant and solvent similar in role to propylene glycol, used to carry actives and give lotions a lighter feel. CIR has reviewed it and considers it safe as used in cosmetics.

A higher-molecular-weight polyethylene glycol ester of hydrogenated castor oil, used as an emulsifier in creams, serums, and other formulations. Like other PEG-modified ingredients, published cosmetic safety assessments grade it as safe in rinse-off and leave-on products.

A corn-derived solvent and humectant that has largely replaced propylene glycol in "clean" formulas; CIR reviewed the alkane diol group and found use concentrations up to about 40 percent in leave-on products like deodorant sticks with no meaningful irritation signal.

A naturally occurring compound found in many plants that acts as a humectant to draw water into the skin and also provides antioxidant support. It is well tolerated and used at modest levels in skincare formulations.

A chemically cross-linked form of sodium hyaluronate designed to remain on the skin surface longer and provide sustained hydration. It functions as a humectant and is well tolerated, with the same safety profile as standard hyaluronic acid.

Large, water-binding polysaccharides derived from connective tissue, used to support hydration and skin firmness. They are inert polysaccharides with no known contact allergens or sensitization potential, and their size and chemistry make significant systemic absorption unlikely.

A humectant that holds water at the skin surface for a more hydrated look. No safety concern.

A soothing plant extract traditionally used in skincare, valued for its potential anti-inflammatory properties. Published assessments note it is generally well tolerated in cosmetic formulations, though people with sensitivities to botanicals may want to patch test.

An extract from the root of the baical skullcap plant, used for antioxidant and skin-conditioning effects. It is generally well tolerated at cosmetic concentrations.

A plant-derived emollient high in linoleic acid, used to support the skin barrier. Generally well tolerated, though some formulators note mild comedogenic potential in heavier occluded applications.

A glycerin-derived humectant and solvent that helps retain water in the skin and dissolve other cosmetic ingredients. It is well tolerated across skin types in the concentrations used in cosmetics.

A broken-down form of hyaluronic acid with smaller molecules intended to penetrate more deeply into the skin. It functions as a humectant and is well tolerated, with the same safety profile as standard hyaluronic acid.

Xanthan gum is a microbial-fermentation-derived polysaccharide used to thicken and stabilize textures, similarly common in food. Cosmetic panel review of this and related microbial gums found them safe as used, with no meaningful irritation signal at typical concentrations.

An undisclosed scent blend that can contain dozens of components. The single most common cause of cosmetic contact allergy, and the blend is not itemized, so you cannot see what is in it.

A volatile ketone used as a fragrance component that occurs naturally in raspberries. Dermatological testing in cosmetics is limited, though it is recognized as safe by regulatory bodies when used in fragrance applications. Fragrance components can trigger reactions in sensitive individuals.