There's nothing magical about a rattlesnake. Just because rattlesnakes are tough and cool doesn't mean that you'll be tough and cool if you eat them. Instead, you might just be a dope.
Snake oils are useless nostrums promoted to treat and/or cure virtually any type of ailment. But they don't have to come from snakes. Some, however, do — such as the rattlesnake pills recently dinged by the CDC for being contaminated with Salmonella bacteria. Kind of ironic, because instead of curing, they actually make the user sick.