In summary, monitor the injection site (if pain increases or the area gets very red, hot, and swollen, inform your doctor as that could indicate injection-site infection, which is exceedingly rare with proper technique)
Within 48 hours after injection of 100 or 1000 mcg of vitamin B 12, 50 to 98% of the injected dose may appear in the urine
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Some medications must be refrigerated, while others should be brought to room temperature before use
These may include: ( 4 ) Fatigue or lack of energy Brain fog or trouble concentrating Irritability or mood swings Pale skin or shortness of breath Tingling in the hands and feet Difficulty walking or staggering Anemia Swollen or inflamed tongue A B12 deficiency in men may also contribute to low testosterone, weight gain, and poor exercise recoverymaking it a hidden factor in many mens health concerns