4-Isobutylresorcinol

4-Isobutylresorcinol is a synthetic antioxidant compound used in skincare formulations. It belongs to the resorcinol family of ingredients and works by neutralising free radicals—unstable molecules that form when skin is exposed to environmental stressors such as UV radiation and pollution.

By reducing oxidative stress, this ingredient aims to support skin's natural defence mechanisms and help maintain skin integrity over time. It is typically incorporated into serums, moisturisers, and targeted treatments at relatively low concentrations.

4-Isobutylresorcinol functions as an antioxidant by donating electrons to free radicals, stabilising them and preventing them from damaging skin cells. Free radicals are generated through sun exposure, pollution, and normal metabolic processes, and their unchecked accumulation can degrade collagen, impair skin barrier function, and contribute to visible signs of aging.

By scavenging these damaging molecules, the ingredient helps create a more stable skin environment and supports the skin's own repair and maintenance processes. This is considered a preventative rather than corrective approach to skincare.

As with most antioxidants, 4-isobutylresorcinol works best as part of a layered skincare routine that includes sun protection, since prevention of new free radical formation is as important as neutralising existing damage. Apply serums or treatments containing this ingredient to clean, dry skin before moisturiser. It can typically be used daily as part of your morning or evening routine, and pairs well with other antioxidants and stabilising ingredients.