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You can get vitamin B12 from many dietary sources and animal products, such as: Meat Fish Eggs Dairy products Nutritional yeast Fortified foods Many People Are Deficient According to the National Institutes of Health (NIH), about 12.5% of adults in the U.S

The honest catch, because Im not going to skip it: its rats, not humans

On/off cycling here is driven by caution, not by tolerance data: because there is no long-term human safety record, building in scheduled off periods is the conservative research default

NICE Clinical Knowledge Summary Vitamin B12 Deficiency

8 weeks 4 vials Plan extra margin for priming losses

Other Vitamin B12 forms, like adenosylcobalamin, are used in certain situations