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Select an injection site such as the abdomen, thigh, or upper arm, rotating sites regularly
Higher muscle use and metabolic demand can increase vitamin D and B12 requirements, especially without adequate intake or sun exposure
How Quickly Does a B12 Shot Work
You could search online for "B12 deficiency cardiac symptoms" if you want more info
Deltoid (Upper Arm): Suitable for Experienced Administrators The deltoid, located in the upper arm, is another effective site for Vitamin B12 injections, especially for those who are experienced in administering injections