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In preclinical studies, researchers carefully monitor for any adverse reactions or physiological changes outside the desired therapeutic effects

Additionally, even people who eat adequate B12-containing foods can sometimes have reduced ability to absorb the vitamin through the gut

[10] Gastrointestinal disturbances-including nausea, loose stools, and a transient fishy body-odor attributable to trimethylamine production from excessive carnitine and choline metabolism-occur in a minority of recipients and are usually self-limiting within 24 to 48 hours after injection

If you're experiencing a medical emergency, please dial 911 or visit your local emergency department