ATD attaches to the androgen receptor. the supplement companies' claim that this creates an "androgen negative feedback boost" is fubar. that may be the case, but blocking the AR means no recovery.
especially in the testicles...which need androgenic stimulation along with gonadatropins to recover. in other words, taking atd will prevent your knads from growing back. look it up on pubmed.
all of the studies showing ATD raises testosterone are also fubar. atd shows up as testosterone on these assays, so measuring testosterone is useless. I have yet to see a measurement of LH or FSH on ATD therapy. That is probably because the results wouldnt look too fab.