What happens to donor stool before it is transferred
Fecal microbiota transplant moves a screened donor's gut community into a recipient to re-establish a more diverse ecosystem. Donor material is rigorously screened for transmissible pathogens, then homogenized, filtered, and either used fresh, frozen, or encapsulated. Delivery routes include colonoscopy, retention enema, oral capsules, or a nasojejunal tube.
Donor screening is the safety backbone of the procedure, since the transferred community carries whatever the donor harbors. Screening protocols expanded substantially after documented transmission events.
Where the evidence is strong and where it is not
The clearest evidence supports FMT for recurrent Clostridioides difficile infection that has not responded to standard antibiotics, where cure rates in trials have been high. For most other conditions, including IBD, IBS, and metabolic disease, results remain investigational and mixed.
FMT is a medical procedure with real risks and is regulated accordingly; do-it-yourself attempts are dangerous. This is general educational information, not medical advice, and any consideration of FMT should go through a qualified clinician.