A B12 shot is a quick intramuscular injection of vitamin B12 (cobalamin) that bypasses the stomach acid, liver metabolism, and intestinal absorption issues that limit oral B12 to roughly 1% bioavailability in most adults
Normally, we obtain vitamin B12 from dietary sources, such as animal protein, dairy, and fortified grains, or in supplement form
Other reported effects include: Headaches and dizziness Nausea and gastrointestinal discomfort Allergic reactions to B12 formulations (rare) If you experience symptoms suggesting a severe allergic reaction (difficulty breathing, severe rash, swelling of face/throat), seek emergency medical attention immediately by calling 999 or attending A&E
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They can support energy metabolism and fat transport, especially in individuals with low B12 or metabolic sluggishness
So thats the background biology