(CNN) Due to a recent rise in reported health issues, the US Food and Drug Administration warned on Tuesday against using or purchasing Rhino male enhancement products.

Since 2007, the FDA said, it has identified more than 25 Rhino products, some with names such as Platinum Rhino 25000 and Krazzy Rhino 25000, that have hidden drug ingredients.

The FDA said the products are often sold in single-serving packages at locations such as gas stations and convenience stores, or through online retailers such as eBay and Amazon. Recently, the products have also been found in international mail shipments, the agency said.

In an email, eBay spokesman Ryan Moore said, "Product safety is important to eBay and we work hard to ensure our marketplace is free of harmful products. These types of items are prohibited under our policies, and therefore not allowed to be listed on the eBay market place." EBay regularly sweeps the site to remove such items, he said.

Amazon pointed to its selling policies and said, "All Marketplace sellers must follow our selling guidelines and those who don't will be subject to action, including potential removal of their account. The products in question are no longer available."

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