can you overdose on vitamin b12 injections Should we be concerned about getting too much B12? Vitamin B12 Overdose & Toxicity:

Once reconstituted, refrigeration is mandatory and use within 4 weeks is advisable

High Supplement Intake vitamin B12 overdose symptoms is taking large amounts of supplements or injections without monitoring levels

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Cautions DO NOT TAKE large doses of vitamins (megadoses or megavitamin therapy) unless directed to by your doctor

Another proposed mechanism involves the binding of homocysteine to the collagenous matrix of bone, which may modify collagen properties and reduce bone strength (reviewed in 113)