Five to six grams. According to the information released by Beijing Satellite TV Yangshengtang, spirulina tablets has the functions of anti-fatigue, anti-hypoxia and enhancing immunity. The dosage is 5-6g 2-3 times a day. Children should reduce the dosage appropriately and swallow it with warm water. Spirulina belongs to Cyanophyta, Cyanophyta and Spirulina, and it is an ancient aquatic plant with lower prokaryotic unicellular or multicellular cells.