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If you notice any adverse effects after you start taking vitamin B12 supplements, you should discontinue use immediately
How Often Should You Get Injected with Vitamin B12
Ideal for Malabsorption Issues : People with conditions such as pernicious anemia, celiac disease, Crohns disease, or those who have had weight loss surgery may struggle to absorb B12 through the gut
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
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