B12 deficiency may result from a vegetarian or vegan diet, as B12 naturally occurs in animal foods
Symptoms of B12 deficiency A vitamin B12 deficiency may go undiagnosed because many of the symptoms fatigue, weakness, constipation, loss of appetite, and weight loss mirror those of minor illnesses or chronic conditions, Nelson explains
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No, there is no downtime required
Many patients begin noticing changes in energy and appetite regulation within weeks
B12 is responsible for numerous functions in the body, including immune health and energy levels, but is often missing from diets, especially among those who abstain from animal products