The patients comfort level, age, sex, physique, and health goals may also determine the injection location
The beyond use date for an opened or entered (e.g., needle punctured) multiple-dose container with antimicrobial preservatives is 28 days, unless otherwise specified by the manufacturer
B12 shots deliver a concentrated amount of cobalamin, a water-soluble vitamin essential for red blood cell formation, neurological function, and DNA synthesis, as detailed in the NIH fact sheet on vitamin B12
Here are some groups of people who might benefit from B12 supplementation: Vegetarians and Vegans: Since B12 is primarily found in animal products, those who avoid meat, dairy, and eggs may be at risk of deficiency
What is Vitamin B12 and Why Does It Matter