The body absorbs vitamin B12 from food in particular meat, fish, eggs and dairy, your body doesnt make it naturally
doi: 10.1016/s0047-6374(97)01897-6
Quality Control Standards Each batch follows internal procedures designed to maintain consistency and dependable ingredient quality
Tissue Eng B Rev 17:165176 Lovric-Bencic M, Sikiric P, Hanzevacki JS, Seiwerth S, Rogic D, Kusec V, Aralica G, Konjevoda P, Batelja L, Blagaic AB (2004) Doxorubicine-congestive heart failure-increased big endothelin-1 plasma concentration: reversal by amlodipine, losartan, and gastric pentadecapeptide BPC157 in rat and mouse
The sterility of each vial is independent, and mixing introduces contamination risk