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The production of intrinsic factor happens in the stomach, which if impaired, can have a hard time properly synthesizing this protein
Migraines Although there is no concrete research forging a direct link between migraines and B12 injections, those with migraines can benefit from Vitamin B12 injections since high Vitamin B12 levels can help with high levels of homocysteine, and thus, reduce the intensity of the migraine
Vitamin B Complex, Menorrhagia, and Cancer: A Critical Review. American Journal of Obstetrics and Gynecology 54.4 (1947): 611-617
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