all anabolics suppress the HPTA; plain and simple. as long as there is some androgenic action it will do this. unfortunately every drug has some level of androgenic activity even
anavar and
primobolan. take D-BOL for 1 month and get your
testosterone level checked. you will see a big decline in your levels,same with
anavar and
primobolan.
remember suppression is'nt only caused by estrogen or progesterin,it is also caused by androgens.