Revivogen is a topical dht blocker and is formulated to not be systemically absorbed so there are no "post fin" side effects. what's your opinion?

Not great: There is already data in regards to topical topical finasteride and topical fluridil, both of which are topical antiandrogens. The data isn't impressive at all. Remember, anything that can be absorbed into the skin can be absorbed into the body(systemically) though it doesn't mean that it happens in large quantities. If you're that interested in treatment consider sticking more main stream.