Letro is indeed extremely powerful, and it will crash your estrogen levels. Therefore, better try off first some other options. For instance, you may try a protocol looking like this:
Week Letrozole Nolvadex Cardarine
1 1.25mgs/ED 40mgs/ED 20mgs/ED
2 2.5mgs/ED 60mgs/ED 20mgs/ED
3 2.5mgs/ED 60mgs/ED 20mgs/ED
4 2.5mgs/ED 60mgs/ED 20mgs/ED
5 1.25mgs/ED 40mgs/ED 20mgs/ED
6 0.5mgs/ED 20mgs/ED 20mgs/ED
TAPER: This phase is required to wean you off the aromatase inhibitors and prevent an estrogen rebound. If you don’t prevent an estrogen rebound, there is a good chance the gyno can come back.
7 0.25mgs/ED 10mgs/ED 20mgs/ED
8 0.25mgs/ED 10mgs/ED 20mgs/ED
9 -NONE- 10mgs/ED 20mgs/ED
10 -NONE- 5mgs/ED 20mgs/ED
If this does not work, only then consider using letro.