Whoa, don't mention the Fin without it's side effects and sometimes permanent sides. The few I know on it have had to seek some type of blue pill or testosterone therapy to counteract.
I kind of enjoy being strong and recovering. Tender breasts, low T, low endurance in/out of bedroom, low RBC and an entire 8.5x11 piece of paper of other side effects don't seem to good for a person much less a runner. I've also noticed a lot of class action lawsuits that Pfizer/Merck etc are going through.
If you really break down the science DHT is what gives a man his characteristics some people are sensitive to the by product of it resulting in follicle damage. Finasteride/Dutasteride are extremely powerful as they shut down DHT production which is why the success rate is in the upper 90th percentile. In Europe they often prescribe SawPalmetto berries and Pygeum bark at least then if sides do happen it's a natural substance(berries/bark) not something highly synthetic that has altered male hormone pathway.