In research studies, COQ10 was found to be beneficial in patients with heart problems ranging from chronic stable angina to an irregular heartbeat. The list of problems includes mitral valve prolapse. I would suggest trying this supplement. If you do, you can work your way up to 200-230 mg a day, and with this supplement the soft gel form is absorbed better than the capsule form.
I imagine that you’re taking some sort of medicine for the MVP, so I would ask your doctor about possible interactions, although I doubt they would occur with a heart medication.
Good luck to you.