
Originally Posted by
Pheedno
Actually deca doesn't aromatize to Progesterone, it can aromatize into dihydronandrolone, which is an AR agonist. The PR is stimulated by nandrolone, and can produce a progesterone-like substance; but it's not progesterone; much weaker.
Progesterone is a prolactin agonist(theory), and both prolactin and progesteron receptors can be found in the mammary gland and can cause gyno which is where prolactin inhibitors come into play
In any case, progesterone related gyno is very rare, and quite hard to form as the amount of progesterone would need to be substantial, and if Test is run at even a lesser dose than Fina or deca, if gyno comes into play, it's most likely still going to be estrogenic