TomkinGHHaddenDRWeaverJAMontgomeryDAD. Vitamin- B-12 status of patients on long-term metformin therapy. BMJ. 1971;2:685-687.
3.
UK Prospective Diabetes Study (UKPDS) Group. Effect of intensive blood-glucose control with metformin on complications in overweight patients with type 2 diabetes (UKPDS 34). Lancet. 1998;352:854-65.
4.
NygardONordehaugJERefsumHUelandPMFarstadMVollsetSE. Plasma homocysteine levels and mortality in patients with coronary artery disease. N England J Med. 1997;337:230-236.
5.
ReinstatlerLQiYPWilliamsonRSGarnJVOakleyGPJr. Association of biochemical B-12 deficiency with metformin therapy and vitamin B-12 supplements: the National Health and Nutrition Examination Survey, 1999–2006. Diabetes Care. 2012;35:327-333.
6.
PfilpsenMCOhRCSaguilASeehusenDASeaquistDTopolskiR. The prevalence of Vitamin B-12 Deficiency in patients with type 2 diabetes: a cross-sectional study. J Am Board Fam Med. 2009;22:528-534.
7.
de JagerJKooyALehertP. Long term treatment with metformin in patients with type 2 diabetes and risk of vitamin B-12 deficiency: randomised placebo controlled trial. BMJ. 2010;340:c2181
8.
TingRZWSzetoCCChanMHMaKKChowKM. Risk factors of vitamin B-12 deficiency in patients receiving metformin. Arch Internal Med. 2006;166(18):1975-1979.
9.
BuamanWAShawSJayatillekeESpungenAMHerbertV. Increased intake of calcium reverses vitamin B-12 malabsorption induced by metformin. Diabetes Care. 2000;23:1227-1231.
10.
MazokopakisEEStarakisIK. Recommendations for diagnosis and management of metformin—induced vitamin B-12 (Cbl) deficiency. Diabetes Res Clin Pract. 2012;97:359-367.
11.
Vidal-AlaballJButlerCCCannings-JohnR. Oral vitamin B-12 versus intramuscular vitamin B-12 for vitamin B-12 deficiency. Cochrane Database Syst Rev. 2005;(3):CD004655.