can vitamin b12 injection cause diarrhea Shots Side Effects And How To Treat Them Vitamin B12 and ulcerative colitis:

The specific number matters less than the trend

Some of these change with tolerance

Injection site redness (mild, transient) Minor swelling at injection area Occasional headache Mild nausea (typically resolves) Fatigue during initial days Sleep changes (some report disturbance, others improvement) Increased appetite Vivid dreams Temporary digestive changes Sleep effects vary considerably among users

Crohns Disease and Other GI Conditions B12 is absorbed in the terminal ileum (the last section of the small intestine)

Vitamin B12 is also critical for maintaining a healthy immune system and producing the mood-regulating chemical serotonin

If it is cloudy or contains particles, do not use it