The speed at which you experience a pick-me-up after a B12 injection can vary depending on a few factors: The Severity of Your Deficiency If you have a mild deficiency, you might feel a difference in energy levels within a few days to a week
This front-loaded approach is designed to: Replenish deficiency more quickly by rebuilding the body's stores
If these side effects occur, visit your nearest emergency department without hesitation or call 9-1-1
Folic acid deficiency can be caused by poor diet, alcoholism, surgery, pregnancy, and malabsorption-causing digestive disorders such as Crohns and celiac diseases
Tell your clinician about any medicines that may affect vitamin B12 or folate testing, such as antibiotics, methotrexate, pyrimethamine, colchicine, para-aminosalicylic acid, or heavy alcohol use
Adjustments depend on lab markers and how well your symptoms respond