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doi: 10.3390/biom10091211
You can also administer a loading dose this is a 1ml injection every second day for 3 injections total and then the normal dose of 1ml every 4 to 6 weeks
Annual blood tests including serum B12, full blood count, ferritin, vitamin D, and folate are recommended as a minimum for long-term post-bariatric monitoring

Another significant metformin side effect: vitamin B12 deficiency
