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Paraffin-embedded mouse skin and lung samples were sectioned and stained with hematoxylin and eosin or Masson's trichrome

Step-by-Step: How to Give a B12 Injection Safely Once your provider has cleared you for self-administration and you have your supplies ready, follow these steps in order

Common side effects include, but may not be limited to: pain or soreness at the injection site mild diarrhea nausea upset stomach Serious side effects may include: signs of an allergic reaction The most serious side effect of Vitamin B complex injections is an anaphylactic shock

Practical & safety What are the most common side effects