When they found them still effective that became the expiry period
Shen, X.-N
Cyanocobalamin Injection NDC Package 71288-300-02 Package Information Cyanocobalamin injection is cyanocobalamin is indicated for vitamin B12 deficiencies due to malabsorption which may be associated with the following conditions: Addisonian (pernicious) anemia Gastrointestinal pathology, dysfunction, or surgery, including gluten enteropathy or sprue, small bowel bacteria overgrowth, total or partial gastrectomy Fish tapeworm infestation Malignancy of pancreas or bowel Folic acid deficiencyIt may be possible to treat the underlying disease by surgical correction of anatomic lesions leading to small bowel bacterial overgrowth, expulsion of fish tapeworm, discontinuation of drugs leading to vitamin malabsorption (see Drug/Laboratory Test Interactions), use of a gluten-free diet in nontropical sprue, or administration of antibiotics in tropical sprue

Final Thoughts The Wolverine Stack's 1:1 BPC-157:TB-500 ratio isn't arbitrary it reflects three things: how the two compounds appear together in published research, the mechanistic symmetry between angiogenesis and cell migration as complementary repair prerequisites, and the practical research advantage of a clean 50/50 split for reconstitution math
Spine 27 , 26312644 (2002)