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Khan Academy

Two weeks is the minimum for meaningful recovery

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

[3] JAK?A VUKOJEVIC

The process was simple and quick

Certain drugs may also interfere with lab tests for vitamin B12 levels
