Oysters are the richest natural source of zinc. Six medium oysters will give you around 76.7 mg of zinc. Oysters have long been known as aphrodisiacs due to their high zinc content. Aside from being rich in zinc, a study conducted by American and Italian chemists also attributed oysters’ aphrodisiacal properties to the presence of two compounds known as D-aspartic acid and NMDA (N-methyl-D-aspartate). The researchers found that these two compounds help release sex hormones such as estrogen and testosterone. The more sexually active a man is, the more zinc he will need. Zinc and oyster extract are among the most common ingredients found in male enhancement supplements. While you can take a zinc supplement or eat oysters and other zinc-rich food to get a testosterone boost, a natural male enhancement supplement will provide you with other nutrients and herbs that will help increase your sex drive and improve your overall sexual health.