vitamin b12 better injected into muscle or subq Best Injection Sites Is intramuscular (IM) administration of
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Other people who are at risk of having vitamin B12 deficiency include those who have had intestinal surgery, or who have gut diseases like Crohns disease or celiac disease
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Also, individuals who have undergone certain surgical procedures, including intestinal resection, bypass, or bariatric surgery, which may reduce Vitamin B12 absorption, are also eligible