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can b12 be injected INJECTIONS Best Vitamin B12 Injection Sites:
Description
However, it is critical to note that no human clinical trials have been published, and the safety and efficacy of 5-Amino-1MQ in humans remain unknown

Ulcerative colitis: diagnosis and treatment (published correction appears in Am Fam Physician

Vegans and vegetarians are at particular risk, since B12 is found almost entirely in animal products

doi: 10.1096/fba.2021-00022

This should do
