Green tea is more valuable for steroid users than black tea

Sportspersons become more and more sophisticated in usage of steroids. They study new methods to mask their administration of banned drugs. Several athletes spend time studying experts’ affirmations which may help them to hide that they dope. Today a way has been found: sportspersons may mask application of testosterone with the help of green tea.
Testosterone represents a hormone which is produced in body naturally. So, it can be difficult for anti-doping organizations to determine that a person has administered testosterone. T: E ratio testing is usually used by anti-doping organizations. Such tests can manifest unusual ratio of testosterone to epitestosterone in urine. But it doesn’t have capacity to show difference between testosterone which has been produced in body naturally and that introduced into body with the help of injections, creams, etc.
 Declan Naughton and his colleagues at Kingston University ( London) have determined that green tea contains such substances which are called “catechins”. They have ability to inhibit the enzyme UGT2B17. This enzyme promotes joining glucuronic acid to testosterone. In case UGT2B17 is inhibited, less testosterone glucoronide is excreted in urine.  
Catechins, the substances which have capacity to mask application of testosterone, are contained in green and white tea. Black tea doesn’t have such substances.
Naughton and his colleagues have conducted some experiments. They conclude that a cup of strong green tea mask application of testosterone.
Thus, those athletes who apply testosterone can decrease quantities of testosterone that are excreted in urine by consumption of green or white tea. Green or white tea can block excretion of testosterone, increasing circulating levels of this hormone.
The World Anti-Doping Agency was informed about the findings by the specialists. If this process occurs, it is not worthy to subject sportspersons to urine tests. Blood tests should be performed in order to detect usage of testosterone.
Olivier Rabin, the WADA’s specialist, confirms that regular checks of blood steroids will be added. Everything will be done by anti-doping organizations in order to avoid fooling of urine tests.