Over the last decade, the FDA has recalled hundreds of dietary supplements that have been linked to serious (and even fatal) side effects. Part of the reason these dangerous products continue to make it to market is that they aren't considered foods or drugs, meaning they come with their own set of rules. The agency can institute warnings, bans, and recalls after consumers report problems, but it must rely on manufacturers to operate aboveboard and report new ingredients. There are supplements that have been proven to be safe and effective. These are not those supplements.
The FDA has recalled too many male sexual-health supplements to mention, but loads of them have been removed from the market for containing tadalafil or sildenafil (or their analogs), the active ingredients in Cialis and Viagra, respectively. Those prescription drugs treat erectile dysfunction by opening up blood vessels, but they can react with nitrates and cause blood vessels to become overly dilated, causing a potentially fatal drop in blood pressure. Banned products include True Man Sexual Energy, Friminite, Love Rider, Jack Rabbit, SexVoltz, Virilis Pro, Silver Sword, Lightning Rod, Rock-It Man, and a host of other tastefully and subtly named supplements. These products are so numerous that the FDA can't keep up with them all, and it has simply offered a blanket warning against using any sexual-performance supplements.
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