Damiana is considered a very mild aphrodisiac. The Paravol is available at GNC. Or you can bu it direct from their website
Paravol Official Website: Male Orgasm Intensifier
I shy away from these multi herb combinations. Companies tend to shove everything that even remotely rumored to have any affect at all and then include it. I would Google the ingredients, one at a time, and check out the discussion groups. On a personal note, I have taken Trib, Horny Goat Weed, Sativa, etc. Trib will make you nervous, horny, flushed, etc., and some say even needs to be "cycled." Same with the weed. Both can accomplish what you are looking for however, in my experienced opinion, each of the ingredients in this may have their advantages but only work in the short term. They are really not for use each and every day forever. Eventually, your own genes will take over and produce what you always have. Besides, you have to also take into consideration the "placebo" effect that also will eventually go away.
Arginine really has nothing in it that will increase your semen, only make your erection harder, possibly making you lengthen your "session" thereby increasing your cum. I doubt a few grams each day is detrimental. It will increase your nighttime erections and keep you awake! Zinc has been known for years to do the same thing, it is the prime ingredient in Oysters, widely known as an aphrodesiac. Swedish Flower Pollen *may* increase your cum and it is used in Europe to decrease the symptoms of enlarged prostate but I believe it is also a diaretic, it increases urination and may therefore, dehydrate you if you don't replenish fluids.
Speaking of which, lots of men swear that drinking water increases their cum. If anything, having to pee when you start to cum, may make you bear down harder with your PC muscle, therefore prolonging your orgasm and amount of cum before you shoot. Otherwise, I fail to see how drinking more water can biologically increase your cum.
Don't be in such a big hurry to shoot off your load or as often as possible. Take time to feel what is happening in your body, prostate, balls and cock. Stop and start several times before shooting your load. Do your PC muscle crunches when you are waiting for the red light to turn green and while you are sitting. All of this will make you a better lover too!
Finally, when you get ready to cum, squeeze. Unless you are 100% hard-wired to dribble, you will shoot.:smile: