This strongly depends on the type and amount of actual substance and the person using them. Steroids can remain detectable in your system anywhere from 1 week to over a year after use. For the most popular steroid like nandrolone decanoate, it could be detected up to the year or even more in certain cases. But in most cases between 3-6 months is commonly sufficient for injectable testosterone. Luckily, for steroid users, the cost of a steroid test is very expensive (around USD 250-300) and hardly ever done. If you are being tested for “drugs” 99% of the time a steroid test is not done. Random tests for college sports will test for them though (the cost is probably the reason why they are random). People usually worry more than they should though. Even though a drug “can” be detectable, a lot of times they aren’t. So, mostly only professional sportsmen should be concerned and look for the “windows” when the substance is not detectable but still produces results.
These detection times were taken from different sources. This list below is for general informational purposes only, contact your GP or WADA specialist for more precise information. Also it’s not medical advice.
Nandrolone Decanoate (deca-duraboline)18 months
Testosterone-mix (Sustanon, Omnadren)
Injectable stanozolol (winstrol)
Methandienone (anabol, dianabol)
Oral stanozolol (winstrol, stanabol)
Testosterone undecanoate (Andriol)