If you start at full dose and develop a headache, you cannot tell if the peptide caused it or if you would have had that headache anyway
In cases of B12 deficiency, digestive issues can arise, leading to symptoms like bloating, gas, and a sense of fullness
That said, although side effects from vitamin B12 supplementation are very rare, it can possibly occur with B12 injections, but not with oral supplements
It is well documented that cats and dogs with chronic enteropathies (CE), intestinal lymphoma, or exocrine pancreatic insufficiency are often cobalamin (B12) deficient (1,2)
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