Hello, I suppose the yeast infection is on your groin? If that s the case you can use an antifungal cream (fluconazole for example) for a couple of weeks or for at least a few days after the yeast has completely recovered. Oral treatment has some benefits and you can also use fluconazole by mouth for the same amount of time. It s better if a dermatologist diagnosed it though. I don t believe that natural supplements or any other non-pharmaceutical product would offer any help. Don t forget to keep the area clean and dry. Avoid leaving your wet shorts on, after exercising! Kind Regards!