can vitamin b12 injections cause diarrhea Hydroxocobalamin (Vitamin B12): Uses, Alternatives, Side Effects & More Vitamin B12 Side Effects Stomach:

In people whose vitamin B 12 deficiency is related to overgrowth of intestinal bacteria, treatment with oral antibiotics such as tetracycline (sold under several brand names) may stop bacterial overgrowth and allow the absorption of vitamin B 12 to return to normal

Description Benefits: Improved energy levels Improved mood Increased metabolism Successful weight management Support production of red blood cells Supports hair, nail, and skin health Prescribing Protocol: Inject intramuscularly, 1-3x per week Product Disclaimer: The extent of the response to Vitamin B12 injection treatment impacting personal results, varies from patient to patient

Definitely purchased month number two

In such cases, methylcobalamin injection offers a more effective approach to quickly restore and maintain optimal B12 levels

So, there seems a possibility it is autoimmune BUT what about the low meat intake