Never taken an AAS but developed gyno behind my left nipple. The cause of my gyno may have been from a pro-hormone cycle that developed 5 months after PCT. Doctor prescribed tamoxifen, although I could of pushed for a prescription for Raloxifene, however, the doctor has more experience treating patients with tamox. After 3 weeks of taking tamoxifen the lump has significantly decreased and I believe will be gone in another few weeks. On a scale of 1 to 10, my doctor said it was a 2. Thought I would share my experience.