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Now, this still remains somewhat of a mystery

The reason is that injections are more easily absorbed by the body, particularly if you have underlying conditions that may lead to an inability to efficiently absorb the vitamin, such as Irritable Bowel Syndrome or Celiac Disease

This way, whenever a dose is extracted from the vial, the stopper will not self-seal effectively, leading to an increased risk of contamination due to environmental influence

Interactions with Other Drugs Vitamin B12 can interact with several medications, so inform your healthcare provider about all the drugs you are taking

The underlying cause of deficiency matters