Haematococcus pluvialis is the microalgae with the highest content of astaxanthin, and it also holds the highest accumulation of astaxanthin among all known biosynthetic organisms. It is widely recognized as the best natural producer of astaxanthin in nature. Haematococcus pluvialis powder is suitable for use as a super antioxidant and food colorant in health food and functional food products, as well as a feed additive and colorant.