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B12 injection shots can usually be felt within 24 hours (and a change should show in blood tests after a month or two) A high dose of B12 oral supplementation takes the same time as an injection: roughly 24 hours to feel an improvement and then up to 2 months to show in blood markers
In 2024, the FDA approved an extended 2.0 mg dose for patients who need better blood sugar control
If you have an allergic reaction to sulfa drugs, treatment will be centered on relieving your symptoms
Nausea or Upset Stomach: In rare cases, individuals may experience mild nausea or upset stomach
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