Hydrolyzed Soy Extract

Hydrolyzed soy extract is derived from soy beans that have been broken down into smaller protein fragments through hydrolysis. This process makes the proteins smaller and easier for the skin to interact with. In skincare, it functions as both an active ingredient and a formulation helper.The ingredient serves multiple purposes: it acts as an antioxidant to help neutralise free radicals, creates a light film on the skin's surface to reduce moisture loss, and helps control the thickness and texture of products during manufacturing.

Hydrolyzed soy extract contains polyphenols and isoflavones — compounds with antioxidant properties. These work by neutralising free radicals, unstable molecules that can damage skin cells and contribute to visible ageing.The protein fragments also sit on the skin's surface to form a thin, occlusive layer. This helps reduce transepidermal water loss, keeping the stratum corneum (the skin's outermost layer) better hydrated. The ingredient also contributes to product texture, helping formulations feel pleasant to apply.

Hydrolyzed soy extract is typically found in leave-on products such as serums, moisturisers, and toners. As it is often one component among many in a formulation, use products containing it as directed by the brand. It works well in layered routines and poses no particular restrictions on combination with other common skincare actives.

Hydrolyzed soy extract is generally well-tolerated across skin types. Those with soy allergies should check product ingredient lists and perform a patch test before full application.