It may help with symptoms, but no studies have been done for
transmission. 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.