I think there may be some benefit to it as an immune booster. One of the ladies that I work with uses it to ward off or treat cold sores and seems to have some positive results. I tried it when I was first infected genitally and didn't see any difference.
I think I'd do some research before I went on a long regimen of it at higher doses, but episodic use should be pretty safe. It's not going to be as effective as the antivirals.