Spirulina is a nutrient rich blue-green algae packed with proteins, vitamins and minerals. This organic powder contains important amino acids including lysine, cysteine, methionine, phenylalanine and threonine. It has a high iron content (more than spinach) and contains more beta-carotene than carrots.
As a food Spirulina has been consumed in various forms over centuries in different parts of the world. Its protein constituent is in an easily digested form. It also contains minerals, vitamins, essential fatty acids and antioxidants that are not available to humans from any single food of vegetable or animal source known so far.
Spirulina is not a reliable source of vitamin B12, whilst it is rich in it, Algae contains B-12 analogues (false B-12) that can provide false results in B12 testing. The only reliable vegan sources of B12 are foods fortified with B12 (including some plant milks, some soy products and some breakfast cereals) and B12 supplements. Vitamin B12, whether in supplements, fortified foods, or animal products, comes from micro-organisms.
To start with the recommended dosage is ½ teaspoon a day, gradually increasing to 3 teaspoons, taken with food or around an hour before mealtimes.