vitamin b12 deficiency after injections What You Need to Know About What are the Signs of
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Vitamin Supplementation Initiate folic acid 400 mcg to 1,000 mcg orally once daily, beginning 7 days before the first dose of pemetrexed for injection and continuing until 21 days after the last dose of pemetrexed for injection [see Warnings and Precautions (5.1)]

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The open-label, pre-post study, published in BMC Rheumatology , included 28 women who took 1000mcg of vitamin B12 a day for nearly two months