Not nearly as hard as the usual suspects. However, its really hard to isolate EQ because most are also using other more androgenic compounds along with it.
EQ alone can and will suppress or shut down ones HPTA. It can also cause testiclular atrophy. I always use small amounts of HCG throughout my cycles to keep a signal of LH going to my testicles to prevent an atrophy and I always use clomid post cycle to restart the HPTA. I also stack Avena Sativa, Maca, Nettle Root, Tribulus post cycle for its effects on sex drive. At www.beyond-a-century.com the powders are cheap and they work well!