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The Cerovecki et al

Nutrition experts have not established a tolerable upper intake level for vitamin B12 (the maximum safe amount per day)

its primary side effect is that it aggravates the respiratory system

Nitrous oxide changes the cobalt core to a different form, which keeps Vitamin B12 in the off position

Too Much B12 and Acne You may have heard that vitamin B12 can cause acne, but that isnt the whole story

In the U.S., state medical boards could similarly sanction physicians for gross deviations from standard care if a complaint is filed
