Phaeodactylum Tricornutum Extract

Phaeodactylum tricornutum extract is derived from a diatom—a single-celled marine microalga—commonly found in ocean ecosystems. The extract is particularly valued for its high concentration of xanthophylls, a class of carotenoid pigments, notably fucoxanthin. These compounds give the extract its antioxidant and photoprotective properties.In skincare formulations, this ingredient functions as a humectant and soothing agent. It works to support skin hydration and help calm irritated or stressed skin, whilst the carotenoids provide antioxidant defence against environmental stressors.

The extract's primary active compounds—particularly fucoxanthin—work through multiple mechanisms. As antioxidants, they scavenge free radicals and reactive oxygen species (ROS) that accumulate in skin when exposed to UV radiation and environmental pollutants. This antioxidant action helps reduce oxidative stress, a key driver of skin inflammation and damage.At a cellular level, fucoxanthin appears to influence inflammatory signalling pathways in skin cells, particularly the IL-6/STAT3 pathway. By modulating this pathway and suppressing the release of pro-inflammatory cytokines, the extract …

Phaeodactylum tricornutum extract is typically incorporated into serums, essences, moisturisers and sun protection products. As it functions as a humectant and soothing agent, it pairs well with other antioxidants and can be used both morning and evening. For best results, apply to clean skin before heavier creams or oils to allow proper absorption. There is no established upper limit for frequency; most products containing this ingredient are suitable for daily use.

Phaeodactylum tricornutum extract is generally well-tolerated in cosmetic use. In vitro safety assessments have shown no significant toxicity. As with any active ingredient, individuals with known sensitivities to marine-derived ingredients or algae should patch test before broader application.