Vitamin B12 Deficiency Long-term use of metformin can interfere with vitamin B12 absorption in the stomach and small intestine, leading to a deficiency in about 6% to 30% of users - especially those on higher doses or taking it for four years or longer
Several cells appear to have the greatest demand for cyanocobalamin, particularly those that undergo rapid division such as bone marrow and epithelial cells.[5][7] Cyanocobalamin binds itself to plasma proteins in the systemic circulation
You still have to nourish your body with enough fuel and the right fuels to perform.
PMID: 21593563 [vi] Park SA, Byeon G, Jhoo JH, Kim HC, Lim MN, Jang JW, Bae JB, Han JW, Kim TH, Kwak KP, Kim BJ, Kim SG, Kim JL, Moon SW, Park JH, Ryu SH, Youn JC, Lee DW, Lee SB, Lee JJ, Lee DY, Kim KW
Naley stosowa wycznie zgodnie z przeznaczeniem badawczym