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Amazon.com: Nature Made Maximum Strength Vitamin B12 5000 mcg, Dietary Supplement for Energy Metabolism Support, 60 Softgels, 60 Day Supply : Health & Household
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Studies on the Minimum Daily Requirement for Vitamin B12 — Hematopoietic Responses to 0.1 Microgm. of Cyanocobalamin or Coenzyme B12, and Comparison of Their Relative Potency | NEJM
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