Is it safe to take l-carnitine, l-arginine, and vitamin e together for sexual performance?

Safe but. So what??: No evidence that they enhance one's performance at all.

Safe, useless: You are a grown man now, Tony. These are placebos. If you are having premature ejaculation, your physician can help. If you are not getting good erections with your favorite partner / pictures / ideas, you need a medical check. If things are basically working, the key is building the relationship and your skills with your whole body