b12 injection cause diarrhea Compounded Methylcobalamin (Vitamin B12) Injection, 5mg/mL Vitamin B12 Injection Side Effects
Description
Biochemical Journal

This is most relevant when vitamin B12 deficiency is being corrected and broader B-vitamin support is clinically appropriate, where symptoms include a combination of fatigue, neurological features, and stress, or where rapid repletion and functional support are desired

If your symptoms worsen then you can simply go back on the B12 shots

Although taste responses in rats and humans differ depending on the sweet stimulus, because the homology between sweet receptors in the two species is less than 70% [62], our results suggest that the diminished sweet craving effect observed in humans treated with tesofensine is most likely not due to taste aversion or impairment in sweet perception
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Side effects are generally mild and rare, including injection site irritation, mild fatigue, or headache