yeah, i've used
17-HD (by
Vyo-tech ). i think it was a phenominal pre-workout supplement. i'll detail why....it flat -out, made me aggressive. if i was still a fighter, i would buy stock in this company. taking it prior to workouts decreased fatigue, made me feel stronger, and really want to physically punish things. howver, i got kind of too agrressive on it, so would only suggest taking this prior to workouts, and leave it in the gym.
the
intensity only last about 1-2 hours, so it wasn't an all-day thing.
i did try
17 Hydroxy-Mesterone (by
IDS ), which is quite similar, as far as ingrediant list is concerned. however, i had next to no noticable effects from this, except for some mild constipation.
p.s. i'm not sure about PCT with this....it seems to affect test levels, as least as far as aggression is concerned, so i would take time off after using it.