...read this first: http://forums.bulknutrition.com/?showtopic=760In short (from the faq by Tolson):
10.0: Drug tests
10.1: Will prohormones show up on drug tests?
Prohormones will not show up on standard drug tests such as employment tests. Some prohormones will cause positives on tests for anabolic steroids, and many will cause positives on drug tests by athletic organizations that specifically ban prohormones. The ones that are most likely to lead to a positive test are precursors to illegal anabolic steroids such as 1,4-andro, 19-nordiol, 4-AD, DHT precursors, and the methylated versions of any of these. Methyl-1-testosterone, 1-AD, and 1-testosterone are unlikely to show up on a drug test.
10.2: How long do prohormones stay in the system?
It depends on the substance. Most prohormones, such as 1-AD/1-test and 4-AD, will probably only be detectable for 3-4 days. However, some, such as 19-nordiol, may be detectable for months. It is a good idea to cease use of any prohormone/steroid at least a month prior to the test to be on the safe side.
10.3: How can I pass a drug test?
Common methods include high water intake combined with diuretics, along with vitamin B complex and creatine to mask the unusually high water intake. The best option is to tell the organization doing the testing that you are taking a legal substance that may cause a false positive and specifically name the substance.
