Blue-green algae are microscopic plants which are more closely akin to bacteria than to seaweed. The popular blue-green algae, spirulina, is currently cultivated and harvested on an industrial scale in the ocean and lakes of several countries. It is commonly sold as a general nutritional supplement or weight-loss agent.
Spirulina (including Spirulina maxima and S. platensis) contains a variety of nutrients, such as protein, a variety of B vitamins and minerals, the antioxidants beta-carotene and vitamin E, and phycocyanin.
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