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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Effect of extended use of single anabolic steroids on urinary steroid excretion and metabolism.

Long-term use of single anabolic steroids by weightlifters and body builders at dosages greater than or equal to 25 mg per 24 h resulted in reduced excretion of urinary androgen metabolites, androsterone and etiocholanolone, compared to values prior to anabolic use. The excretion of major urinary metabolites of glucocorticoids was not affected by anabolic use. Urinary excretion of anabolic steroids or anabolic metabolites averaged 20-25% of total anabolic steroid administered. The major excreted metabolites of methandrostenolone, nandrolone, oxandrolone and oxymetholone were identified by gas chromatography-mass spectrometry based on the major mass spectral ion peaks.[1]

References

  1. Effect of extended use of single anabolic steroids on urinary steroid excretion and metabolism. Harrison, L.M., Martin, D., Gotlin, R.W., Fennessey, P.V. J. Chromatogr. (1989) [Pubmed]
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