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To minimize the risk of infection, make sure the packaging and all materials are clean and sterile
Its not just about preference its all about something called intrinsic factor If your body doesnt produce enough intrinsic factor, you wont absorb B12 properly from food or tablets no matter how many you take
On the other hand, if you are self-administering, then the thigh is a more convenient location
doi:10.3390/nu11030557
It works as a signaling molecule, telling your cells to do certain things
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