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Changes appeared within 11 to 28 days in mouse studies
38% of reviews mention "starting to feel the effect wearing off" by the second week, prompting the next injection
REFERENCES USED AS SOURCES FOR THIS PAGE: 1 Vitamin B12 injection via Cleveland Clinic
Plus, the symptoms of low B12 can be very subtle, or they may be confused for symptoms of other conditions
However, the publicly available evidence does not support broad conclusions about complete toxicological safety, long-duration exposure, reproductive or developmental risk, immunological risk, genotoxicity, or suitability for any non-research application
Angle of injection too vertical : As discussed above in detail, the angle of injection may not be severe enough in young children who have very little fat to deal with in order to hit fatty tissue and not muscle
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