L-Arginine
It’s no surprise that Enzyte’s “natural male enhancement” supplement—with its late-night TV ads aimed at the male psyche—would feature this amino acid. L-arginine is a natural precursor to nitric oxide, the potent vasodilator that puts the erect in erection. But while consistent natural NO levels are linked to tumescence, the body seems to simply adjust to an artificial boost.
Horny Goat Weed
The hardy Asian plants of the genus Epimedium produce icariin, a flavonoid that inhibits expression of the PDE5 family of enzymes. So what, you say? Well, PDE5 prevents erections. (Stifling PDE5 is Viagra’s reason for being.) A study at Zhejiang Traditional Chinese Medicine University claimed that icariin also increases short-term production of nitric oxide.
Zinc
In men, low zinc intake correlates with low testosterone and low semen output. But if you have normal Zn levels, binging on it can lead to reduced immune function.
Tribulus terrestris
No, it’s not the juice of a Star Trek furry; it’s a weedy flowering plant. Studies have indicated that protodioscin, a steroidal saponin in its fruit, stimulates production of male hormones and nitric oxide; at least one other study shows that it doesn’t.
The real trouble with Tribulus is that overuse has been linked to kidney and liver poisoning.http://www.wired.com/magazine/2011/12/st_whatsinside_enzyte/?utm_source=Contextly&utm_medium=RelatedLinks&utm_campaign=InterestingHokey plain and simple.