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Nutritionists and medical researchers are postulating that spirulina does not contain vitamin B12; but contains a pseudo form that is not useful to humans. Can any body shed some light on this with evidenced based information?

My brother has been a vegan from his mid teen years. He is now in his mid fifties and experiencing some memory loss/"dementia." Conventional medicine attributes this to nutritional deprivation of vitamin B12. That I am not too convinced about. Is there any empirical data to prove that vegans...