There is some concern as to
Tren being progestagenic, so if you should opt to stack it with an aromatizable compound it may worsen potential gynocomastia so adding winstrol or Nolvadex, or even both to such a stack may be wise. But in itself or in a non-aromatizing stack this is not necessary. The use for post-cycle estrogen antagonists is limited as well, so Nolva or clomid to boost natural
test will have little use. It is a very strong androgen receptor agonist however, so perhaps using some HCG after a cycle may help you retain more gains and prevent testicular shrinkage, but since HCG does increase estrogen that does reinstate the use of Nolvadex or clomid as well.
This was wrote by someone else but maybe it will help.