IF YOU GO to a convenience store and see a product behind the counter with a name like "Boner Blaster 5,000," it's a surefire way to know a supplement is not legit. But not all scams are that obvious. That’s because the supplements made of “herbal Viagra” or other natural ingredients don’t always work.

“Even if you buy them at a big retailer, and they seem to be made of ‘natural' ingredients, be cautious,” says Jamin Brahmbhatt, MD , urologist at Orlando Health. “No one is regulating this stuff.”

That's concerning. When it comes to supplements, it’s not clear what you could be putting in your body. There's always the chance it could harm your overall health—and make any erectile dysfunction problem worse. So Men’s Health turned to the experts to get the lowdown on which supplements boost sex drive and/or help with ED.…