Spirulina is a type of blue-green algae that people can take as a dietary supplement. People consider spirulina a superfood due to its excellent nutritional content and health benefits.
 
Spirulina has a high protein and vitamin content, which makes it an excellent dietary supplement for people on vegetarian or vegan diets. Research suggests that spirulina has antioxidant and inflammation-fighting properties, as well as the ability to help regulate the immune system. Consuming spirulina is one way to supplement protein and vitamins in people’s diets without notable side effects. One tablespoon or 7 grams (g) of dried spirulina contains: 20 calories, 4.02 g of protein, 1.67 g of carbohydrate, 0.54 g of fat, 8 milligrams (mg) of calcium, 2 mg of iron, 14 mg of magnesium, 8 mg of phosphorous, 95 mg of potassium, 73 mg of sodium, 0.7 mg of vitamin C. It also contains thiamin, riboflavin, niacin, folate, and vitamins B-6, A, and K. Taking spirulina, as part of a balanced diet, may help a person to stay well nourished.