@candquilt-- I don't think that there are alternatives that are equally effective and that work the same way. Prescription anti-viral medications are best for those suffering from severe and chronic herpes outbreaks.
There are supplements and some remedies that may be used to support the immune system. And I'm sure that they will be beneficial, but they might not prevent or treat herpes outbreaks as effectively as anti-virals. For example, lysine, an amino acid, may be used as an oral supplement or a topical cream. There are also natural herbs and foods rich in vitamins, minerals and antioxidants that can strengthen the immune system.
It's best to ask a doctor because herpes symptoms and their intensity varies from person to person.