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Sometimes it tells you everything is fine
Vitamin B12 has a very low risk of toxicity, so there's really no upper limit to how much you can take without harm
PMID 16953016
B12 & Lipo-B Injections for Effective Weight Loss Medical professionals have long used Vitamin B-12 injections to help those suffering from vitamin deficiencies
while the acute repletion might be IV/IM for a period, they may transition to high-dose oral vitamins thereafter
Screening for vitamin B12 deficiency: caveat emptor
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