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Masteron is a derivative of DHT (as you can tell from its chemical name: 2a-methyl-dihydro-testosterone propionate), but what they fail to tell you is that DHT and its derivatives are commonly used in treatment of certain forms of breast cancer (see the etymology here: MASTectomy, gynocoMASTia, MASTeron, get it?). Masteron is not clinically used for weight gain, so this makes it a very unique steroid from that perspective. Unfortunately, much of the information on Masteron available in medical journals doesnt focus on weight or strength gain or even fat loss, for those reasons.