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Letters Bodybuilding supplements

Is the breast cancer drug tamoxifen being sold as a bodybuilding dietary supplement?

BMJ 2014; 348 doi: (Published 13 February 2014) Cite this as: BMJ 2014;348:g1476
  1. Michael Evans-Brown, scientific analyst1,
  2. Andreas Kimergård, visiting lecturer2,
  3. Jim McVeigh, deputy director2,
  4. Martin Chandler, human enhancement drugs researcher2,
  5. Simon D Brandt, reader in bioactive drug chemistry3
  1. 1European Monitoring Centre for Drugs and Drug Addiction (EMCDDA), Lisbon, Portugal
  2. 2Centre for Public Health, Liverpool John Moores University, Liverpool, UK
  3. 3School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, Liverpool, UK
  1. Michael.Evans-Brown{at}

For more than 30 years, bodybuilders have taken tamoxifen to prevent and treat gynaecomastia caused by use of anabolic steroids.1 2 3 Usually, tamoxifen is sourced from the illicit market. However, bodybuilding discussion forums have speculated that a dietary supplement called Esto Suppress contains tamoxifen because the label listed one of its chemical names (figure). Four samples were purchased at different times between late 2011 …

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