Risk of Positive Doping Tests Following Ingestion of Supplements Contaminated With Trace Quantities of Nandrolone Metabolites

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00682123
Recruitment Status : Completed
First Posted : May 22, 2008
Last Update Posted : May 22, 2008
UK Sport, 40 Bernard Street, London, WC1N 1ST
Information provided by:
Loughborough University

Brief Summary:

There is compelling evidence that some dietary supplements consumed by the general population are manufactured and stored under conditions that lead to contamination of the end product with small amounts of extraneous materials. In most cases, this is harmless, but for athletes liable to drug testing as a consequence of their participation in sport, the potential consequences of even trivial amounts of a prohibited substance may be catastrophic. Quality control procedures for pharmaceutical products normally specify the absence of contaminants at a level of more than 0.1%, ie 1mg/g. However, in the case of an anabolic steroid such as nandrolone, the amount that will cause a positive test has been estimated to be about 1-3µg (Geyer et al, 2004). In the case of a supplement that is taken in high doses (20-30 g/d), such as for example creatine, this means that a contamination level of something closer to 0.00001% (ie 1µg/g) may cause a positive test. This work have been supported by recent findings from our laboratory (Judkins et al, 2006). These data demonstrate that as little as 10μg of 19-noradrostenedione (19-NorAD) added to a creatine supplement resulted in a positive doping test in all volunteers testing. This is one thousand times less that the purity level specified for pharmaceutical agents and at this level, these contaminants are without any pharmacological action.

Proposals are under development to regulate the sale of dietary supplements for use by athletes to avoid accidental doping positives as a result of ingestion of contaminated supplements. This requires a knowledge of the amounts of contaminant that is likely to cause problems. The aim of the present study was to examine the urinary excretion pattern of nandrolone metabolites following 1µg, 2.5µg and 5µg doses of 19-norandrostendione in both male and female subjects. The quantity of 19-norandrostenedione administered in this study is representative of the amount previously reported as an undeclared contaminant in some dietary supplements. Given the speculation surrounding positive doping cases being attributed to ingestion of sports supplements contaminated with pro-hormones, this presents an important consideration for both athletes and doping agencies, as well as supplement manufacturers.

Condition or disease Intervention/treatment Phase
Positive Doping Tests in Sports Dietary Supplement: 19-norandrostendione Phase 1 Phase 2

Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 20 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Single (Participant)
Primary Purpose: Basic Science
Official Title: Supplement Contamination: Detection of Nandrolone Metabolites in Urine After Administration of Small Doses of a Nandrolone Precursor
Study Start Date : March 2006
Actual Primary Completion Date : September 2006
Actual Study Completion Date : September 2006

Resource links provided by the National Library of Medicine

U.S. FDA Resources

Intervention Details:
    Dietary Supplement: 19-norandrostendione

    Volunteers recieved 500mL of water containing 5g of creatine monohydrate and either 1.0μg, 2.5μg or 5.0μg of 19-norandrostendione in a single-blind crossover manner.

    The amount of 19-norandrostendione administered was trivial, and far less than the amounts shown to be present in many popular dietary supplements. The recommended dosage according to the distributors is 100 mg 2-3 times daily, so the administered daily dose was not more than 0.05% of the recommended dose. This dose has no measurable physiological or pharmacological effects.

Primary Outcome Measures :
  1. Urinary 19-norandrosterone (19-NA) and 19-noretiocholanolone (19-NE) concentrations [ Time Frame: All urine passed for 24h following supplement ingestion ]

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Ages Eligible for Study:   18 Years to 35 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Healthy male and female volunteers aged between 18 - 35 years of age

Exclusion Criteria:

  • Any potential participant competing in sport at a level where there is even a remote possibility of being called for a drugs test was excluded

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To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00682123

United Kingdom
Loughborough University, School of Sport and Exercise Sciences
Loughborough, Leicestershire, United Kingdom, LE11 3TU
Sponsors and Collaborators
Loughborough University
UK Sport, 40 Bernard Street, London, WC1N 1ST
Principal Investigator: Ronald Maughan, PhD Loughborough University

Responsible Party: Professor Ronald Maughan, Loughborough University Identifier: NCT00682123     History of Changes
Other Study ID Numbers: R05-P39
First Posted: May 22, 2008    Key Record Dates
Last Update Posted: May 22, 2008
Last Verified: May 2008

Keywords provided by Loughborough University:
drugs in sport
World Anti-Doping Agency

Additional relevant MeSH terms:
Nandrolone decanoate
Nandrolone phenpropionate
Hormones, Hormone Substitutes, and Hormone Antagonists
Physiological Effects of Drugs
Anabolic Agents