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However, if you are taking vitamin B12 because you think it will cure your joint pain, then you may not experience the results you're hoping for

Check homocysteine (should be under 9) and MCV (should be 80-92) instead to detect cellular deficiency, even when serum B12 appears normal

Assuming more is always better serum B12 above 1,000 pg/mL from supplementation is generally harmless, but persistently high B12 without supplementation warrants investigation for liver disease or myeloproliferative disorders [7]

in many cases, its well within your power to keep things under control