how are b12 injections administered Treating Severe Vitamin Deficiency Instruction Guide for Intramuscular (IM)
Description
Proceedings of the National Academy of Sciences of the United States of America
However, if your body has trouble absorbing B12 due to digestive issues, pills may not be as effective

People with low potassium (hypokalemia)

Though it differs a bit from one person to another, the effects of B12 vitamins usually last around 48 hours to 72 hours after the initial injection

Those with insulin resistance, diabetes, or metabolic syndrome may not tolerate the glucose-elevating effects of growth hormone
