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The authors noted that human research remains limited to small pilot studies, and that no major adverse effects have been reported in published animal or early human work

Pataer A, Ozpolat B, Shao R, Cashman NR, Plotkin SS, Samuel CE, Lin SH, Kabil NN, Wang J, Majidi M, Fang B, Roth JA, Vaporciyan AA, Wistuba II, Hung MC, Swisher SG

2003 May;58(2):281-6
Benefits of B12 shots B12 shots offer numerous benefits for individuals with vitamin B12 deficiency

EBioMedicine 30, 138147
