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If you're significantly deficient, you may feel a difference the same day
New England Journal of Medicine 2013;368:2041
The duration of the effect of a B12 injection can vary
HealthLinkBC: Quick Nutrition Check for Vitamin B 12 HealthLinkBC: Vitamin B 12 Deficiency Anemia HealthLinkBC: Getting Enough Folic Acid HealthLinkBC: Folate and Your Health HealthLinkBC: Folic Acid Oral HealthLinkBC: Pregnancy and Nutrition: Folate and Preventing Neural Tube Defects HealthLinkBC: Folic Acid Test Health Canada: Canadian Nutrient File National Institutes of Health: Vitamin B 12 Fact Sheet for Consumers National Health Service (NHS): Patient Factsheet: Vitamin B 12 Deficiency This guideline is based on scientific evidence current as of the effective date
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