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As we age, stomach acid production can decline (atrophic gastritis), which makes it harder to extract B12 from food or pills
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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
However, it lacks the clinical trial data and regulatory approval of GLP-1 agonists, and its effects may be more modest
Fill a couple of milliliters of air into the syringe
The no-observed-adverse-effect level (NOAEL) was set at 50mg/kg, the highest dose tested
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