masteron isn't gonna help you fight off gyno bro. to fight off gyno from a current cycle, you need one of two things: AI (aromatase inhibitor) or SERMs (selective estrogen recceptor modulators). Basically, testosterone will amoratize (convert to estrogen) by way of a particular enzyme. Too much estrogen leads to the unwanted side effects such as gyno. An AI would be most successful for someone to take at the start of their cycle to prevent the enzyme's conversation activity, thus keeping your test from converting to estrogen. Each AI has a different effectiveness at accomplishing this. Some are 80% effective while others are 85%. The SERMs are designed to block the receptors from taking up the estrogen that has already been produced from testosterone converstion.

Although Masteron does not aromatize, it is not suitable for a substitute for either and AI or SERMs. It's just simply an anobolic that does not convert. If you're wanting to fight off some gyno, you'll be better served to go with an SERM like Nolva. You may even want to consider adding an AI like Aromasin to help gain control of your overal estrogen levels. Once you correct the gyno issues with the Nolva, you can stop using it but stay on the Aromasin to prevent the reoccurence.

Hope this is helpful.