Spirulina can add plant-based protein, iron and naturally occurring nutrients to vegan, vegetarian and flexitarian diets.
No single food provides everything a person needs. People following a vegan diet should still plan for nutrients that may require particular attention, including vitamin B12, vitamin D, iodine, calcium, iron and omega-3 fats. Individual needs differ, and spirulina should not be treated as a replacement for a varied diet or prescribed supplements.
If you are concerned about iron, vitamin B12 or another deficiency, ask a qualified healthcare professional about appropriate testing and advice.