Isosorbide Dicaprylate

Isosorbide dicaprylate (IDC) is a synthetic derivative of caprylic acid, a naturally occurring fatty acid. It is created by combining isosorbide (a sugar alcohol) with caprylic acid chains, producing a lightweight conditioning agent designed to work with the skin's own structure.In skincare formulations, IDC functions as a skin conditioner and emollient. It works to improve the skin's ability to retain moisture and maintain its protective barrier function, making it particularly relevant for formulations targeting barrier-compromised or dehydrated skin.

IDC interacts with the skin's keratinocytes (the cells that form the outer layer) to promote their healthy differentiation and maturation. This supports the organisation of the stratum corneum—the skin's outermost, protective layer—which is critical for water retention and barrier resilience.Additionally, IDC may help regulate inflammatory pathways within skin cells. When used alongside complementary actives, it shows potential to modulate immune signalling in barrier-compromised states, though its precise mechanism in living skin remains an area of ongoing research.

IDC is typically used in leave-on formulations such as lotions and creams at concentrations around 2%. It works well as part of a layered skincare routine and can be applied to damp skin to help lock in hydration. There is no established upper limit for frequency; it can generally be incorporated into daily morning and evening routines as part of your regular moisturiser or barrier-support product.

IDC is generally well-tolerated and has no established cautions for typical topical use. As with any new skincare product, patch testing is recommended, especially for sensitive or barrier-compromised skin.