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Description
Allergic reaction symptoms can include skin rashes, itching, and swelling

Taking in extra B12 through injections or supplements when your levels are already normal will not provide additional benefits
In addition to alanine, a standard blood biomarker in MDs (Shaham et al., 2010), patients with primary mitochondrial respiratory chain disease also have significantly elevated levels of BCAAs (Vockley and Ensenauer, 2006)

Summary: Diarrhoea is an uncommon side effect of vitamin B12 supplementation, occurring rarely and more often related to supplement formulation or excipients than the vitamin itself
