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How Your Body Handles Vitamin B12 Your body needs to have a properly functioning pancreas, an unharmed stomach and intestines, and adequate levels of intrinsic factor, a protein that binds to vitamin B12 in the stomachonly then will you be able to absorb vitamin B12 as efficiently as possible
Usually resolves quickly
Most injection-related non-response stems from intramuscular rather than subcutaneous administration, which alters absorption kinetics unpredictably.
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The easiest approach is using peptides that don't require daily dosing
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