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(PubMed) Quinlivan EP, McPartlin J, McNulty H, et al
Without continued diet and exercise, most users experience some regain
(AIs are established when there is insufficient information to determine EARs and RDAs.) For children ages 113 years, the RDA increases with age from 0.9 to 1.8 g/day
Diet: heavy alcohol use and certain nutrients can lower your B12, so you may notice effects fading sooner
[43] Blood loss from GI bleeding, in addition to blood loss during menstruation, makes female runners and endurance athletes especially susceptible to iron deficiency
Raising B12 levels improves energy, memory, and nerve health
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