I would like to add that I am also on 4ad. I am doing a cycle type method and taking every precaution that I can think of. You need a cover for your testis if you are going to apply at night. I woke up in the middle of the night with a tingling sensation because I failed to do this myself. Yes it was actually in the testis itself. (this is the hard way to prove local effect)
Do not use anything that will starve them of oxygen but make sure the gel is dry and clean off any excess on your pecker. Then use a thick cloth to separate your pecker from your balls. Any other method that will do this all night without slipping off (2 sets off underwear, underwear and boxers) will be fine.
I am not working out because I would like to know for sure if this is the reason I am growing. So far, I have actually lost alittle of length. I would think this is because I am loosing some of the stretched length from working out. But, I have gained girth. This could be from better blood flow but man does if feel thick. This is my 3rd day on this.
If I am correct then gains from PE ARE from stretching the tunica and ligs. The tunica responds by slowly thickening it up again over time. This could be why you gain fast in the beginning and hit a plateau. After awhile the tunica begins to thicken once again and the plateau is broken. There would actually not be any micro tear affect to speak off. (another guess but it sounds logical since you do loose a bit of L if you dont “cement” your gains)
That link I posted isnt for actual growth. It is a vasculator only. Similar to the pills that are out on the market now. I said it would help because it, good blood flow to the penis is extremly important no matter what method you use.