Experts have warned that Estro Suppress supplement used by bodybuilders contains breast cancer drug tamoxifen which may cause side effects.

The team told the British Medical Journal (BMJ) that it was not clear whether Esto Suppress at the moment available in market contained tamoxifen or not as their analysis was carried out two years ago.
But they warned, “Since the 2000s, a growing number of off-the-shelf ’food’, ’ herbal’ or ’dietary supplements’ - aimed at gym-goers and people wanting to lose weight or enhance their sex lives - have contained pharmacologically active substances (including anabolic steroids, stimulants and appetite suppressants).”
Researchers said most of the users do not even know that they are using this drug. They have urged physicians to question patients on the use of supplements because some problems in body might be a side effect of tamoxifen.
This drug lowers the level of estrogen hormone in the body. In breast cancer patients, it lowers the amount of estrogen and inhibits tumour growth.
Source-Medindia