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In WADA FAQs on the Prohibited List they note, "Use of supplement products that have been subjected to one of the available quality assurance schemes can help to reduce, but not eliminate, the risk of an inadvertent doping infringement." WADA does not approve, certify, or endorse dietary supplements
Nat Immunol (2021) 22:110717
G.Jr.BladtF.BirchmeierC.et al
39 Guerrero-Romero, F., Jaquez-Chairez, F
"Systematic review and pragmatic clinical approach to oral and nasal vitamin B12 (cobalamin) treatment in patients with vitamin B12 deficiency related to gastrointestinal disorders"
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