That just means, one, which I didnt read that one study, but there is one study that talks about mutating your genes, but thats a little different than what Brendan was talking about, but could cause cancer as well
Potential Benefits & Side Effects Observations from preclinical and early research literature
The Animal Nutrition Supplement Injection of copper and vitamin B12 at concentrations of 0.2% and 0.1%, respectively, is a versatile and effective formulation designed to address specific deficiencies in livestock and other animals
Gastrointestinal absorption of vitamin B 12depends on the presence of sufficient intrinsic factor and calcium ions
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Within 5 to 8 days after the dose, the infants experienced significantly increased hemoglobin and reticulocyte counts, normoblastic erythropoiesis, improved mental status, regression of abnormal skin pigmentation, and reduction in tremors.[9] Three hundred sixty-six pregnant women in India received 50 mcg of oral vitamin B 12 or placebo capsules once daily beginning during their first trimester of pregnancy and continuing until 6 weeks postpartum