Staph is a "super bug" that, before now, couldn't be stopped. It includes Methicillin-resistant Staphylococcus aureus (MRSA) and other forms.
Remedies from the Dark Ages certainly don't sound like trustworthy things. After all, they are from a time when healers slapped leeches on their patients and walked around warding off "evil smells," which were thought to be the root of infection. However, one potion has survived that may even help patients today, even overcoming resilient superbugs that antibiotics can no longer handle.