Observed effects in human trials Reported adverse events across the IV and oral trials included headache, fatigue, dizziness, nasopharyngitis, diarrhea, flatulence, increased appetite, nausea, and back pain
How Quickly Can I Expect to See Results
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Headache after B12 shot is a common side effect for many people receiving vitamin B12 injections
Worse still, could B12 shots make you feel even more tired and fatigued than before starting the injections
(1992) Effects of insulin-like growth factor-I on glucose tolerance, insulin levels, and insulin secretion