Tetrahydrodiferuloylmethane

Tetrahydrodiferuloylmethane, commonly known as tetrahydrocurcumin (THC), is a reduced form of curcumin — the active compound found in turmeric. Unlike curcumin, which has limited stability in cosmetic formulations, tetrahydrocurcumin is more bioavailable and better absorbed by the skin, making it a more practical choice for skincare products.In the skin, this ingredient functions as an antioxidant, helping to neutralise free radicals that accumulate from environmental stressors such as UV exposure and pollution. It also appears to have anti-inflammatory properties, which may be relevant for…

Tetrahydrocurcumin works primarily by scavenging free radicals — unstable molecules that damage skin cells and contribute to premature ageing. By donating electrons to these unstable molecules, it neutralises them before they can cause oxidative stress. This antioxidant activity is thought to be more efficient than that of its parent compound, curcumin.Additionally, research suggests tetrahydrocurcumin may influence cellular signalling pathways involved in inflammation and cellular health. It appears to modulate how skin cells respond to stress, potentially supporting the skin's natural rep…

Tetrahydrocurcumin is typically incorporated into serums, moisturisers, and treatment products at low concentrations. It works well as part of a layered skincare routine alongside other antioxidants or in formulations designed to support skin barrier health. As with any antioxidant ingredient, consistency of use is more important than occasional application — daily or regular use is generally recommended to build protective benefits over time.

Tetrahydrocurcumin is generally well-tolerated in topical skincare. As a turmeric-derived compound, it is unlikely to cause irritation in most users, though those with known sensitivity to curcumin or turmeric should exercise caution.