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The National Institute of Health (NIH) shares that the recommended dietary allowance (RDA) for vitamin B12 is: Infants 06 months: 0.4 microgram Infants 712 months: 0.5 microgram Toddlers 13 years: 0.9 microgram Children 48 years: 1.2 micrograms Children 913 years: 1.8 micrograms Adult men and women over age 14: 2.4 micrograms Women who are pregnant: 2.6 micrograms Women who are breastfeeding: 2.8micrograms For adults over 50 years old, the NIH recommends taking a daily vitamin B12 supplement or consuming foods fortified with vitamin B12

Vitamin B12 for Athletes: Dosing and Evidence (2026): The Short Answer Vitamin B12 (cobalamin) is essential for red blood cell production, oxygen delivery, and nerve function, all of which directly affect endurance performance