I recently took a drug test for my job while on a winstrol only cycle. It did not test for AS, just the basic, marajana, heroin, cocaine etc. So i wasnt worried about failing it. However my tests showed that I was using a masking agent, and i havent taken ANYTHING. The ONLY other supplements i have been taking pretty heavily are Choline, inositol, vit. c and ALA. I was not fired because i did not test positive, and i have never used a recreational drug in my life and my boss knows that. Im just worried as to why I tested this way? We had some other employees actually use masking agents and they were detected. Did one of the above supplements act as a masking agent? or was it the winny? Any ideas?