I do take Lecithin (it’s good for your brain, too) and Pygmeum. And do take daily protein drinks (which contain arginine of course). And hydrate very generously always.
And when I am with my amazingly tight pussied girlfriend, I bring myself to the brink a few times. It’s not always the same. Supplements only go so far. But those occasions when she claims my disk is as big as her forearm (it sometimes seems like it), she cums repeatedly, and then I shower her with cum and she loves it - ah, those are the moments.
I think the Lecithin has had some effect. Being a tad past 50 I didn’t like not cumming as much as I used to, and between kegels and lecithin, hey, on occasion I beat myself as a youngster.