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When it comes to supplements, taking high doses of vitamin C at the same time as your B12 shot might slightly lower the amount of B12 your body can use, but this is more relevant for oral B12 supplements than injections
If you notice any adverse effects after you start taking vitamin B12 supplements, you should discontinue use immediately
For an intramuscular (IM) injection, the usual choice is a 22 to 25 gauge needle, 1 to 1.5 inches long
So, I know this frustration really well
Research shows that 4 mm needles are effective, less painful, and carry no risk of penetrating muscle tissue, even in lean people
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