On that dosage it's very unlikely. However nothing is 100% sure. An extremly close friend of mine, my traing partner, started to notice gyno signs when he/we toke winny, but the dosage was 70mg/day. I didn't feel anything. But winny "halftime" (don't know if this is the correct english word) is about 9-12 hours, so if you notice anything just stop taking the winny.