How can I help out my coworkers?

Hi everyone I work at Quest in the costumer support division and I have a couple of acquaintances that are being constantly hared and made fun of. My coworkers are spreading horrible rumors and lies because they all have some sort of bodily problem. Two of my acquaintances are actually brothers and for some odd reason they literally smell like human feces. The coworkers are saying it's because they bathe in human fecal matter. Anther of my acquaintances actually smells like salty garbage. Coworkers are saying that he probably lives in a dumpster near a salt manufacturing plant. My other acquaintance, for some weird reason has a small patch of white hair on the back of his head. I know it's not because of his age because he is in his mid 20's. My coworkers are spreading a horrible rumor saying that (excuse my vulgarity) older men j-i-z-z in his hair and he uses it as gel and slicks his hair back. I know they have bodily problems but that's no reason to pick on them. I have tried confronting my coworkers and asking them to stop but they refuse to listen and continue to make fun of those men. I have even tired telling our supervisor what is going on but he says that it is harmless humor and that he can't do anything about it. If anyone has experienced this or has experienced the bodily problems they have please give me some advice on what to do. Thank you in advance.