Investigative ophthalmology & visual science, 38(5), 848-854
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The same is true if your blood work only shows signs of mild abnormalities: high levels of reticulocytes (immature red blood cells), homocysteine (an amino acid broken down by vitamin B12), or methylmalonic acid (MMA, a byproduct of amino acid breakdown) should subside after just a few vitamin B12 injection treatments
US Department of Agriculture
The speed at which a Vitamin B12 shot works can vary depending on several factors, including the individuals level of deficiency, overall health, and the presence of any underlying medical conditions
Depending on your condition, after your first round of shots, your doctor may keep you on a regular regimen of shots or shift you to other delivery systems like pills or liquids