Hello. I understand your concern, but I want to reassure you that receiving a 1500 mcg Methylcobalamin injection at this stage is considered very safe.
Because your
Vitamin B12 levels were initially quite low (less than 100), your body required those first 10 injections to quickly build back its essential stores.
Why It Is Safe
Water-Soluble Nature: Vitamin B12 is water-soluble. This means your body absorbs what it needs and naturally filters out any excess through your urine.
Low Toxicity: There is no established "Upper Limit" for B12 intake because it has a very low potential for toxicity, even at high doses like 1500 mcg.
Maintenance Phase: Moving to one injection every three months, as your doctor suggested, is a standard "maintenance" schedule to ensure your levels do not drop back into the deficiency range.
Next Steps
Follow the Schedule: It is safe to proceed with the maintenance dose every three months as advised.
Monitor Symptoms: Keep track of any returning symptoms like tingling in the hands/feet, extreme fatigue, or memory fog, and report them to your doctor.
Dietary Support: If you are vegetarian or vegan, discuss B12-fortified foods or oral supplements with your physician to support your levels between injections.