Vitamin B12
Vitamin B12 can be found in many foods, such as nutritional yeast, chlorella, spirulina, nori, mushroom, and organic produce. Many vegans believe that eating the right plant-based foods can provide sufficient vitamin B12. Nevertheless, there is no scientific proof for this belief. Indeed, some studies have suggested that vegans and vegetarians can be at a higher risk of vitamin B12 deficiency, particularly when they do not take any supplements. This vitamin is needed for important bodily functions, including the formation of red blood cells, protein metabolism, and the nervous system.[2]