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vit b12 injection technique How to Administer an Intramuscular at Home Vitamin B12 Injection Procedure
Description
Do not use it and contact the pharmacy immediately for replacement or further instructions

Some practitioners recommend delaying food intake for 30-60 minutes post-injection to allow the peptides peak effects to occur in the continued fasted state

It's about supporting your body's natural functions, not forcing an unnatural change
You may of course, but B12 supplements must be broken down before they are passed throughout the body