Cobalt and Vitamin B12 Elevated urinary cobalt concentrations identified in routine doping controls can originate from vitamin B12 Publication Knoop, A., Görgens, C., Geyer, H., & Thevis, M. Elevated urinary [...] urinary cobalt concentrations identified in routine doping controls can originate from vitamin B 12 . Rapid Communications in Mass Spectrometry 2020 Apr 15;34 (7) Download the publication Summary In 2015 [...] as an adverse analytical finding, urinary reference concentrations were reported to range between 0.1 and 2 ng/mL. In June 2019, a routine doping control urine sample was tested for cobalt and returned