Vancomycin Study in Multiple Sclerosis (MS)

This study is testing whether vancomycin — an antibiotic — can alter the gut microbiome (the trillions of bacteria living in your intestines) and potentially affect the course of multiple sclerosis (MS). There is growing evidence that gut bacteria play a role in immune system regulation, and this study explores whether disrupting certain bacteria early in MS could influence disease activity. **You may be eligible if:** - You are 18–50 years old - You have been newly diagnosed with MS, clinically isolated syndrome (CIS), or radiologically isolated syndrome (RIS) within the past year - You have not yet started any MS treatment - You are able to understand the risks and give informed consent **You may NOT be eligible if:** - You have taken antibiotics in the past 90 days - You have taken probiotics, prebiotics, or corticosteroids in the past month - You currently smoke - You have a history of inflammatory bowel disease, chronic infections (hepatitis B/C, HIV), or serious gut conditions - You are pregnant or less than 6 months postpartum Talk to your doctor to see if this trial is right for you.