Don't let it sit out on the bench while you prepare the rest of your experiment
If you experience side effects that concern you, discuss them with your GP or practice nurse
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Feeling better and even loosing some weight
In short: B12 shots are used because they deliver vitamin B12 faster, more reliably, and more efficiently than oral supplements, especially if you have an absorption issue
Summary: Feeling worse after a B12 injection typically reflects your body adjusting to replenished vitamin levels, triggering metabolic processes that may temporarily cause fatigue, headaches, or injection site discomfort