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Good food sources of vitamin B12 include organic meats, beef, poultry, milk, shellfish, fish, eggs, dairy products, wheat germ, soybeans, fortified cereals, orange juice, oranges, and nutritional yeast

If oral B12 replacement has been trialled in a person with metformin-associated B12 deficiency, I would suggest that a repeat measurement of B12 levels after 812 weeks is a good time to reassess whether absorption is adequate or whether a switch to intramuscular replacement is required

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For example, if your supplement happens to be 10 g, then cutting it in half and taking the resulting 5 g supplement twice a day (at least 4 hours apart) will meet the EFSA recommendations

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Intramuscular route: For IM administration, Normal Saline is acceptable since only a small volume is used and the injection is given immediately, minimizing any risk of chloride-induced degradation