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Vitamin B12 primarily comes from animal-based products, which makes those who follow vegetarian and vegan diets more likely to develop vitamin deficiency
This direct delivery is why the timeline for injections is often measured in days rather than weeks, especially for someone who was deficient
However, cognitive dysfunction was linked to Hcy and did not correlate with Vit B12 levels in any of these studies (Table 1)
ISBN 978-1-315-11954-0
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