The Precision Peptide Genetic Test reveals predispositions in peptide-related pathways (GIPR, GLP1R, FTO, MC4R variants) but does not predict B12 metabolism directly
Since this 2012 publication, there has been very little new research into this question
Always follow up as scheduled so your provider can make that decision with you
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So keep your wits about you, ask lots of questions, check their backgrounds, ask to see training evidence, and yes make sure they're at least a medical pro when the treatment feels less beauty and more medically - do the leg work - don't die
Vegans can also experience deficiency due to the difficulty in obtaining vitamin B12 through their diet