Hello. While there are no risks with taking a fat burner WITH alli, there may be risks with taking a fat burner. Many of them contain potent stimulants like caffeine, which can raise heart rate and blood pressure. I do not recommend fat burner supplements for that reason.
If you and your friend are seeing success with the alli plan, keep on it! Best of health!
Maria Marzella Sulli, Pharm.D.