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Individual Health Factors Your bodys response to Vitamin B12 depends on your health characteristics because these elements affect both its potency and speed of action
Natural sources rich in B12 tend to be derived from animal foods, so anyone following a vegan or vegetarian diet may need to supplement
How Soon Will I Feel Results
Most people having B12 injections (intramuscular) will see an improvement in the first 24 hours, but the hematological response, including the quick production of new red blood cells, may take several days to months for a full response
Fortunately, there is increasing evidence that oral B12 supplements are just as good as injections for raising blood levels in most people ( Vegetarians and vegans are usually advised to take at least 10 mcg per day, or at least 2,000 mcg once per week ( However, some doctors still prefer the use of injections
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