not responding to b12 injections Injections: Who Should Get Them and How Long Do They Last? A Guide to Vitamin B12

While the RNI for maintenance is only 1.5 g daily, therapeutic oral doses typically range from: 50-150 g daily for mild deficiency prevention in at-risk groups 1,000-2,000 g daily for treating confirmed deficiency without malabsorption Some formulations contain up to 5,000 g, though there is no proven additional benefit over 1,000-2,000 g for most patients The reason for this dosage discrepancy lies in absorption efficiency

However, the top two ranked administration routes were the oral route (78.3) and the IM route (49.6)

Most people notice a real improvement after a course of two to three injections

But you can also use B12 shots for cold and flu symptom relief