Diglycerin

Diglycerin is a humectant derived from glycerin, consisting of two glycerin molecules linked together. It functions as a skin conditioning agent and moisture-binding ingredient commonly used in skincare formulations.Unlike its parent ingredient glycerin, diglycerin has a slightly larger molecular structure, which may offer different penetration and hydration characteristics. It works primarily by attracting and retaining water within the stratum corneum, the outermost layer of skin.

Diglycerin functions as a humectant by attracting water molecules from the environment and deeper skin layers, drawing them into the stratum corneum. This moisture-binding action helps to plump and hydrate the skin surface, which can temporarily improve skin texture and appearance.The molecule's size and structure mean it may distribute differently through the skin compared to smaller humectants like glycerin, potentially offering a more sustained hydration effect in some formulations.

Diglycerin is typically incorporated into serums, moisturisers, and hydrating toners at modest concentrations. For best results, apply to damp skin to maximise the humectant effect, as these ingredients work more effectively when there is ambient moisture available. Layer it under an occlusive moisturiser in dry conditions to seal in hydration.

Diglycerin is generally well-tolerated and considered safe for topical skincare use. No major contraindications or common adverse effects have been reported; it is suitable for most skin types, including sensitive skin.