Most vitamin B12 injections and oral supplements in the United States use a form of vitamin B12 called cyanocobalamin, however this form of vitamin B12 has the toxin cyanide connected to the molecule
(2018) used the current understanding from tendon, ligament and bone and applied this to gastrointestinal tract healing, which could provide a pathway for understanding of the systemic healing capabilities for applications to other tissues
While current clinical and anecdotal evidence hasnt shown an increased risk, caution makes sense, especially if you have a history of cancer or concerns about tumors
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Higher-Caution Situations Extra medical supervision is important if you: have a history of reactions to injectable vitamins/cobalamins have significant kidney or liver disease are pregnant or breastfeeding are offered a compounded MIC B12 product without clear labeling of ingredients, concentrations, and compounding source The FDAs overview of compounding helps explain why quality can vary (see Compounding and the FDA: Questions and Answers )