Zinc keeps popping up in a number of studies, all of them having to do with sexual performance.

Science has known for a while that the distinctively white trace mineral plays a key role in human reproduction and the regulation of testosterone, but we are just coming to understand how down in the nitty-gritty of things it is.

Not enough zinc in your diet? You're liable to have erectile dysfunction. Zinc helps in the production of important sex hormones, such as testosterone and prolactin, and also enables the creation of the main component of prostatic fluid.

Not to put too fine a point on it, but zinc can make you better in bed, according to one study indicated. The researchers learned that rats which received a moderate daily oral dose of zinc sulphate showed an increase in time before ejaculation and penile thrusting. Another study found that a supplement containing folic acid, zinc, and the botanical golden root improved the ejaculatory control of those suffering from premature ejaculation. Still more research has shown how zinc may be useful as a potential treatment for ED in those with long-term kidney disease.

Ever wonder how oysters got their reputation as an aphrodisiac? Their zinc levels are through the roof.

Aside from oysters – which contain more zinc per serving than any other food – you'll find plenty of zinc in red meat, lamb and garbanzo beans. But even though zinc is a common component of most multi-vitamin pills, you should check with your doctor before you decide to take any zinc-only supplements – especially if your plan is to combat ED. That kind of regimen has its own set of rules.

Take more than 40 milligrams of zinc a day and rather than ending up the Big Man on Campus you're liable to come down with a case of zinc toxicity. Mild toxicity will cause diarrhea, nausea and cramping. Really overdo it with the zinc and you will find yourself with a fever, headache and loss of muscle coordination. Make a lifestyle out of it and you risk long-term zinc toxicity which can cause anemia and severely weaken your immune system. Zinc supplements are also highly reactive with other medications, particularly blood pressure meds and diuretics. Avoid taking zinc supplements at the same time as other mineral supplements, and wait a good 1 to 2 hours after a meal.