Polyglycerin-4

Polyglycerin-4 is a humectant derived from glycerin, a naturally occurring compound found in plant and animal fats. It functions by attracting water molecules from the environment and deeper skin layers, helping to bind moisture within the epidermis. This makes it useful in formulations where hydration is a priority.As a humectant, polyglycerin-4 works at a molecular level to support the skin's natural moisture-retention capacity. It is typically used in concentrations that allow it to integrate smoothly into serums, moisturisers, and other hydrating products without creating a heavy or occ…

Polyglycerin-4 operates through a humectant mechanism. Humectants are hygroscopic molecules that have an affinity for water. When applied to skin, polyglycerin-4 attracts water molecules from the dermis (deeper skin layer) and from the environment, drawing them into the stratum corneum (the skin's outermost layer).This process helps to increase skin hydration and can temporarily improve skin texture and appearance. The ingredient does not occlude the skin (form a barrier) in the way that oils or waxes do; instead, it works by creating a favourable environment for moisture retention within t…

Polyglycerin-4 is most effective when applied to damp or slightly moist skin, as it can draw moisture from the surface and deeper layers. Use it in serums or lightweight moisturisers, ideally layering it before heavier creams to optimise hydration. In dry or low-humidity environments, follow with an occlusive moisturiser to prevent transepidermal water loss and maximise the ingredient's benefits.

Polyglycerin-4 is generally well-tolerated and is not known to be a common irritant or sensitiser. It is suitable for most skin types, including sensitive skin.