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Many people feel quick benefits like better energy, improved mood, or sharper thinking after getting a B12 injection
It is not for human or animal use , nor for any form of in vivo experimentation
[1] Other rare side effects noted (mostly in older literature or high-dose use) include: polycythemia vera and peripheral vascular thrombosis in patients receiving repeated injections (though these associations are not well understood, they were listed in prior product literature as possible adverse events)
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