Increased folate levels - B12 and folate balance each other in the body
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[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)
Injections commonly contain 1,000 mcg
The many forms of B12 always include the work cobalamin in their chemical name