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Certain individuals should not receive B12 injections without explicit medical clearance or should avoid them altogether

Deuterium and TritiumLabelled Compounds: Applications in the Life Sciences

Dunn WB, Broadhurst D, Begley P, et al

(PubMed) Gao L, Mao Q, Cao J, Wang Y, Zhou X, Fan L

The absence of dramatic day-to-day shifts doesn't indicate problems
