There is NO permanent cure for herpes at this time. Anyone who tells you otherwise is almost certainly attempting to sell you something. However, taking/applying olive leaf extract probably won't hurt anything apart from your wallet.
So I've seen. This person hasn't tried to sell anything... yet, so may be a legitimate question. Scouring the internet has a propensity to inform a person about a lot of cures for a lot of ailments that... aren't. Most only have the effect of making your body smell a bit more like herbs (or onions) and curing fat wallet disease. :)