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For vitamin B12 to be absorbed from the gut, it must bind to a protein called intrinsic factor, which limits how much B12 the gut can take in at one time
Chalmers, Z
Is it dietary intake, or is it absorption
References Mandal M, Sarkar M, Khan A, Biswas M, Masi A, Rakwal R, et al
When delivered via intramuscular injection, B12 energy booster shots bypass the digestive system and enter the bloodstream directlyoffering faster and more effective results
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