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Adult Dosing Dosage may vary based on different medical indications: For the initial treatment of vitamin B12 deficiency, the usual dose is 1000mcg SC/IM, given once a day for 1 week, followed by 1 dose a week for 1 month
Mar-Apr 2015;36(2):230-4
If you prefer more forgiving measurements, the 5mg vial with 2mL gives you a lower concentration with larger, easier-to-read unit markings on your syringe
Conditions like pernicious anaemia (an autoimmune condition affecting a protein called intrinsic factor vital for B12 absorption), stomach issues (such as from reduced stomach acid or certain medications like proton pump inhibitors), intestinal disorders (like Crohns disease or coeliac disease), or even surgical removal of parts of the small intestine (e.g., gastric bypass surgery) can prevent proper absorption
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