lndole-3-propionic acid as a marker and for treatment for Huntington Disease.An exemplarypharmaceutical composition for treating or preventing neurodegenerative 3disease,hypertension, stroke, ischemic heart disease or head injury in an animal, orfor delaying orameliorating the effects of said disease or injury in an animal suffering fromsame maycomprise indole-3-propionic acid or a salt or ester or protein 6 complex orinorganically boundpreparation thereof and a pharmaceutically acceptable carrier therefor.