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Some of the most common secondary causes include: Endometriosis This disorder occurs when tissue similar to the tissue that normally lines the inside of your uterus grows outside your uterus, often adhering to your bladder, ovaries, or even your bowels

See the side-effects section above for the full breakdown

Endocrinologa y Nutricin (English Edition) 59(8):487490 Reinstatler L et al (2012) Association of biochemical B 12 deficiency with metformin therapy and vitamin B 12 supplements: the National Health and Nutrition Examination Survey, 19992006

- Daily Dosage: Unlike B12 shots, which may only be needed monthly, oral supplements typically require daily intake