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Plant-Based Vitamin B12 At present, it is only certain that the freshwater algae chlorella contains a guaranteed vegan source of B12, provided that it has been grown naturally (not under sterile farm conditions)
In a population-based study of 3884 elderly people, deficiency of vitamin B 12 was associated with almost 70% more likelihood of having a depressive disorder.54 In another cross-sectional study of 700 community-dwelling, physically disabled women aged 65 years, vitamin B 12 deficient women were twice more likely to have severe depressive symptoms.55 Although controlled studies to show response to vitamin B 12 replacement therapy in depression are lacking, it is recommended that all patients with vitamin B 12 deficiency should be managed as part of depression treatment
Eating animal products typically gives your body more than enough of the nutrient, but there are particular groups of people more susceptible to a B12 deficiency
A few commenters noted that quartiles reflect only relative ranking, not performance against an absolute or meaningful standard
