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It is a useful reminder to consider vitamin B12 deficiency in people taking metformin who have megaloblastic anaemia, neuropathy or other symptoms suggestive of deficiency

pylori infection (a common cause of peptic ulcers)

Hershey Medical Center: Menstrual Pain Mayo Clinic: Vitamin B12

Goldenseal ( Hydrastis canadensis ) is a perennial plant native to eastern North America ( Its roots and leaves have been used in traditional medicine to treat a variety of ailments, especially those involving infections or inflammation ( Today goldenseal ranks amongst the most popular herbal remedies worldwide

I feel that's a different situation from injecting on a personal level