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Keep in mind that oral B is not well absorbed in people who truly lack intrinsic factor or have certain GI issues, which is why B is usually injected or given as a high-dose sublingual in those cases
doi: 10.1073/pnas.0501988102 74 HajnalACovasaMBelloNT
But identifying the right molecule is only one test out of many, and it is the easiest one
The most appropriate option depends on factors such as weight loss goals, health history, and how an individual responds to treatment under medical supervision
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