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Tolerability (early human safety): Short human studies reported a placebo-like safety profile with no serious adverse events [5] [6]
Caring for Your Body After Metabolism Shots Some minor discomfort may occur around the injection site
Vitamin B12 is best injected intramuscularly into the deltoid (upper arm), thigh, or gluteal muscle (buttocks)
While not strictly necessary for personal research use, these measures reduce contamination risk significantly
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