Coix Lacryma-Jobi Ma-Yuen Shell Extract

Coix Lacryma-Jobi Ma-Yuen Shell Extract is derived from Job's tears, a grain-like seed native to tropical Asia. The shell extract contains polysaccharides and other hydrophilic compounds that function as a humectant—a substance that attracts and binds water molecules.In skincare formulations, this ingredient works to increase the water content of the outer layers of the skin, helping to maintain hydration and improve skin texture. It is often used in moisturisers, serums, and hydrating treatments.

Humectants work by establishing a moisture gradient: they draw water from the deeper dermis and from the air into the outer layers of the epidermis. The polysaccharides in Coix Lacryma-Jobi Ma-Yuen Shell Extract are hygroscopic, meaning they have a strong affinity for water molecules.When applied topically, this extract helps the skin retain more water, which temporarily improves hydration markers such as skin firmness and elasticity. This effect is most pronounced in humid environments and is often complemented by occlusives (like oils) to prevent water loss.

This ingredient works best as part of a layered hydration routine. Apply it to damp skin (after cleansing or a hydrating toner) to maximise water absorption, then follow with an emollient or occlusive to seal hydration in. It can be used daily in serums or moisturisers. For best results, use it in conjunction with a humidifier or in more humid climates, as humectants work less effectively in very dry environments.

Generally well-tolerated and suitable for most skin types. Allergic reactions are rare but possible; patch test first if you have sensitive skin or known sensitivities to plant extracts.