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Because B12 is water-soluble, the NIH Office of Dietary Supplements notes that no tolerable upper intake level has been established excess B12 is excreted by the body rather than accumulating to toxic levels

This and a B-12 deficiency may damage your nerves, with or without diabetes

Not all vitamin supplements are created equal, and when it comes to vitamin B12, the question of what form of B12 is the safest and most efficient is still a hot-button topic among experts and health enthusiasts

Do they work through the same mechanism

Patients should be counseled on dietary sources of vitamin B12, including animal products such as meat, poultry, fish, eggs, and dairy