Headache Mild diarrhea Mild pain or redness at the injection site Nausea Serious or rare side effects Stop taking Vitamin B12 Injection and seek immediate medical attention right away if you experience any of the following: Allergic reactions, including angioedema, hives, and trouble breathing Signs of heart problems, including swelling, rapid weight gain, and shortness of breath Signs of hypokalemia, including muscle weakness, slow or irregular heartbeat Contraindications: This is not an exhaustive list of contraindications
Certain populations need to inject B12 in larger doses to maintain baseline health: Individuals with pernicious anemia are initially injected with 100 mcg daily for one week, followed by 100 mcg every other day for 3-4 weeks
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This timing takes advantage of the bodys natural post-overnight fast state when insulin levels are low and fatty acid mobilization is already elevated
