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B12 absorption occurs primarily in the terminal ileum via intrinsic factor-mediated uptake, with approximately 1% absorbed through passive diffusion at high doses

Since vitamin B12 is mainly found in animal foods, vegetarians and vegans may need fortified foods or supplements to meet their daily requirements

This includes: Those who have had allergic reactions to vitamin B12 or cobalt before People with certain health conditions, like Lebers disease Getting a full medical history and talking to a doctor before starting vitamin B12 injections is very important

The Upper Arm (Deltoid Muscle) The upper arm is one of the most common spots for B12 injections, and for good reason

Always use sterile equipment and change the injection site with each dose to minimize inflammation and tissue damage