Isoamyl P-Methoxycinnamate

Isoamyl p-methoxycinnamate is an organic chemical ultraviolet filter used primarily in sunscreen and photoprotective skincare formulations. It works by absorbing ultraviolet B (UVB) radiation—the wavelength range responsible for sunburn and many skin cancers—and converting it into harmless heat energy.As a chemical filter, it sits on the skin's surface and begins to work immediately upon application. It is found in a relatively small percentage of commercial skincare products, often used alongside other UV filters to provide broad-spectrum protection.

Isoamyl p-methoxycinnamate is a UV absorber that intercepts ultraviolet B rays before they can penetrate the skin. When UV photons strike the molecule, it absorbs their energy and re-emits it as heat, effectively neutralising the radiation's harmful potential.The ingredient remains largely in the outer layer of the stratum corneum (the skin's outermost dead cell layer) rather than penetrating deeper, which supports its use as a surface-level photoprotective agent.

Apply isoamyl p-methoxycinnamate-containing products generously to all sun-exposed areas at least 15 minutes before sun exposure to allow it to settle on the skin. Use daily as part of a consistent photoprotection routine, reapply every two hours or immediately after swimming or sweating, and combine with other sun-protective measures such as clothing and shade-seeking behaviour for optimal skin health.

Isoamyl p-methoxycinnamate is generally well-tolerated in topical sunscreen formulations at typical use concentrations. It is not approved as a UV filter in all markets; formulation and concentration are subject to regional regulations.