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Don't inject them
Never pool remaining volumes from two opened vials into one container
Not sure which combination is right for you
Because any excess is passed out in the urine rather than stored, there is no meaningful overdose risk, and serious reactions are rare
When you eat, insulin levels rise to facilitate nutrient storage
If you follow a vegan diet, lack B12-rich food, or suffer from health conditions like B12 deficiency, which happens when a person cannot absorb it properly, then you may experience b12 deficiency
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