However, if you are ill, high doses of vitamin B12 that you might receive to treat a deficiency may cause some symptoms, such as: What to avoid while taking B12
Strategies that may help include: Eating smaller, more frequent meals rather than large meals Avoiding high-fat, greasy, or spicy foods which may worsen nausea Staying well-hydrated Avoiding lying down immediately after eating Taking the medication at a consistent time each week (some people find evening injections help with overnight nausea) If side effects are severe or don't improve, your provider may adjust your dose more slowly or suggest additional supportive measures
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High homocysteine When homocysteine is not efficiently remethylated to methionine or directed through transsulfuration, it can favor SAH accumulation