No medication exists to lower B12 levels specifically, and there is no clinical need for one because the B12 itself isnt causing harm
Nicotinamide N-methyltransferase (NNMT) in health and disease. Cellular and Molecular Life Sciences, 78, 62416257
However, scientific research shows that very high-dose oral B12 (1,000-2,000 mcg) can be effective for some, as about 1% can be absorbed without intrinsic factor
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But as we know, animal based foods are not always the best option for us (especially when trying to eat healthier or with specific diets), so, the answer to this question can also be to try supplements, like our B12 shots
This synergy is under exploration in models studying aging, metabolic health, and endurance performance