are vitamin b12 injections better than pills vs. Oral Supplements: Which is Better? Vitamin B12 Injections: What You

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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For patients with genuinely adequate B12 status, the addition is unlikely to produce noticeable effects

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This ensures the medication remains uncontaminated until it's time for use