The researchers purchased four samples of a dietary supplement called ‘Esto Suppress’ and analysed its contents. Tamoxifen was found in three out of the four samples at different concentrations. The product label suggested a dosage of two capsules a day. “In the past, 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,” claimed Dr blog url Michael Evans-Brown of Liverpool John Moores University in Britain. These include anabolic steroids, erectogenics (to stimulate erections), stimulants, appetite suppressants and anxiolytics (to treat anxiety). Often the substances are not listed on the labelling and products may be marketed as ‘natural,’ said the study published in the British Medical Journal (BMJ).