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The research supports both approaches depending on what you are optimizing for
"Oral vitamin B12 versus intramuscular vitamin B12 for vitamin B12 deficiency: a systematic review of randomized controlled trials"
When your B12 is low, replacing it can help you feel more energized, which makes it easier to stay active and stick with a plan
This bioavailability gap means oral dosing requires higher amounts to achieve equivalent systemic exposure
These aren't symptoms that should be downplayed
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