severe diarrhea after b12 injection Managing Post-Injection Nausea and Discomfort B12 Shots Side Effects And

however, causality has not been established (2,3,5)

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These include hair loss, brittle nails, and slow healing of wounds

Studies show the consuming an excessive amount of vitamin B12 may: Increase the risk of cardiovascular events in people with diabetic nephropathy : A study published in JAMA sought to determine whether B vitamin therapy was able to slow the progression of diabetic nephropathy (kidney damage due to diabetes) and prevent vascular complications

Some patients report feeling more energetic within 4872 hours of their first injection, whilst others may not notice significant changes for several weeks