You would be surprised how bad your 'gyno' can get and still be totally reversible. I get it on both sides. Major flare ups.
But the LAST thing I ever do is used letro. Letro is harsh harsh harsh. I use purity solutions exemestane whilst on cycle eod, and some purity solutions nolva, also eod.
I am very prone to gyno and this combination keeps my totally clear and my nips are not even sensitive.
If you honestly do have a problem that will only be 'cured' with letro ... save the letro as a last resort. AND I can tell you one thing .... you are going to have to take it longer than you think. Guys who run it for 1 or 2 weeks and are cleared up are few and far between and probably only had swelling in the first place, not real gyno. As long as Purity Solutions letro is as good as all their other chem's ... I would use them in complete confidence.
Guys .... in this modern era .... making RC's is not really that difficult OR expensive. Purity offers high quality at low prices. Others who charge a lot more are just riding you for all you got.
You will notice Purity does not carry igf1. Reason? Becasue they tested 8 sources of igf1 and they were all bunk so the owner does not carry it.
This is a guy with integrity who cares about his customer first.