One tablespoon of spirulina powder, about 7 grams, contains the following nutrients: 4 grams of protein, 11% of the recommended daily intake of Vitamin B1, 15% of B2 and 4% of B3, 21% of the recommended daily intake of copper and 11% of iron. It also contains potassium, magnesium, and manganese. This amount has only 20 calories and 1.7 grams of digestible carbohydrate. The recommended daily dose of Spirulina powder or tablets is one to three grams, though some practitioners recommend up to ten grams per day.

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