This is a localized reaction with redness, pain, tenderness, and swelling at the injection site that occurson average seven to 10 days after vaccination , says Hana El Sahly, M.D., an associate professor of molecular virology and microbiology at Baylor College of Medicine in Houston and a national co-principal investigator of the phase 3 clinical trial for the Moderna vaccine
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The best B12 injection schedule depends on your health needs and how you react to the treatment
For severe deficiencies, daily or weekly infusions might be needed at first
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