@Chasen20 - I don't think there's a prostate or urethral problem with your precum production (unless there are other related problems like nocturnal emissions, pain, or something else that is pointing to an underlying problem). How old are you?
Going to the ponr is good for building up a load and getting you horny but to be honest, the best thing for precum and cum production is to cum frequently. The body will build up as you edge and cum and will adapt and keep building. Then take a break from cumming and edge to pour for a few days. Do that a few times and you'll see a difference. Like with supplement cycling, the body is smart and will adapt. Use that to your favour.
I have indeed and so far the vitamin shop brand seems to work well. Granted, it turns my cum super white and thick like yogurt, but as long as I brink plenty of water and ingest celery, the shots of cum are improved. As for the precum, the pygeum turns it into a thick mucous consistency as well but doesn't hinder the flow or production. Although, tbh, I'm using a saw palmetto/pygeum blend. As soon as this bottle is done, I will cop a bottle of pygeum only.
Omega 3's and multivitamins help precum a lot. (be sure to pay attention to the amount of zinc in the MV if you are already taking some Zinc. This is an element where one should take caution with the amount ingested.