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Its important to note that if your B12 levels are already normal, additional injections are unlikely to boost your energy
While these typically subside within a few days, you should always notify your doctor just in case, Wirtz says
The effects may last longer for some, while others may require more frequent injections to maintain consistent energy levels
The reticulocyte count (immature red blood cells) typically rises within 35 days of starting treatment, indicating that bone marrow is responding appropriately to therapy
Intramuscular injection delivers B12 directly into tissue, which is critical for patients whose digestive systems cannot absorb oral supplements effectively
