Fucoxanthin is a brown seaweed pigment that is found in most brown seaweeds, as well as a few other marine sources. It is a xanthophyll, which is a molecule structurally similar to beta-carotene and vitamin A; yet fucoxanthin does not possess vitamin-like activity in the body.
Fucoxanthin, via its metabolites, seems to be stored in fat cells for a prolonged period of time and can induce fat loss while inhibiting fat cell differentiation and proliferation. Although only one human study has been published, it appears to be a promising non-stimulatory fat loss agent but requires time to work (5-16 weeks).
It also possesses other health benefits, such as correcting abnormalities in glucose metabolism in muscle tissue which can help diabetics and might reduce cholesterol levels and triglycerides by currently unverified mechanisms. Reductions in blood pressure and reductions in both liver fat stores and liver enzyme values have been noted with fucoxanthin supplementation in humans.
Fucoxanthin, although usage as a supplement is preliminary, appears to be a very promising joint fat loss and health boosting agent.