hit vein during b12 injection What Happens if You Inject Vitamin Wrong? Vitamin B12 Injection Sites: All
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Storz et al

One observational study analyzed the health records of nearly 25,956 patients diagnosed with vitamin B12 deficiency
These animals were also subjected to the same environmental conditions and treatment protocols for a chronic 28-day administration study [2]

Therefore, its important to get enough B12 for immune system support and recognize the signs of a deficiency