Astaxanthin (β-Carotene-4,4′-dione, Trans-Astaxanthin), a xanthophyll carotenoid, is a nutrient with unique cell membrane actions and diverse clinical benefits with excellent safety and tolerability. Astaxanthin, a red dietary carotenoid isolated from Haematococcus pluvialis, is a modulator of PPARγ and a potent antioxidant with antiproliferative, neuroprotective and anti-inflammatory activity.