If you are looking to reduce transmission to partners, the only known ways to reduce that are to use antivirals (
Valtrex, acyclovir,
famvir)
and condoms, along with avoiding sexual activity when you have any symptoms.
If you are looking to reduce outbreaks, studies are mixed for this.
Here's a very small study that showed promise - https://www.ncbi.nlm.nih.gov/pubmed/3115841
Here's one that showed a reduction in recurrences, but not in healing time - https://www.ncbi.nlm.nih.