NOW Foods Spirulina 500mg 200 Tabs 100% Natural Nutrient Rich Superfood Grown in Hawaii A Dietary Supplement Vegetarian Formula Spirulina is a single-celled freshwater algae & an incredible source of nutrients. It provides generous amounts of Beta-Carotene, Vitamin B-12, Iron & Chlorophyll. Spirulina also provides RNA, DNA & important GLA fatty acids.