Tribulus raises testosterone levels if they're low for some reason.
Eg if your a bit older and natural test levels have dropped a bit since you were a young strapping lad (like me)
If you've had sex (with someone, or even yourself) and you're feeling lethargic afterwards (some people get tired after sex).
L-ARGINE is great!
Better and more sustained pump after training! That's not only good because you look better for lnger but also because it allows increased blood flow to the muscles allowing nutrients there more easily.
Apparently Arginine raises natural growth hormone production whilst you sleep too, but I can't find the articles on it.
Also, arginine increases bloods flow 'downstairs' as well. this can make it a bit... fuller!
So mic the two and you have test levels like a horny teenager (quicker recovery time too), better pumped muscles AND a slightly bigger winky. Are you married/girlfreind? If nothing else. Do it for her! (Remember to cuddle