For anyone who is looking for something that will; definitely stop, definitely shrink, definitely prevent the creation of more tumors in a person with NF2 who has VS or other tumor forms and locations, there is none. There are however options to potentially help slow tumor progression down.
There are chemotherapy type treatments in NF2 Clinical Trials not approved because none has worked well enough yet. Even Avastin, the longest standing clinical trial helps some people and not others and when it does work it does not work for more than a few years.
The botanicals have not gone further than mice trials because at best they offer stability. Three that offer that are; 1 - Boswellia (Indian Frankincense), 2 - CAPE Propolis and 3 - Curcumin (Indian Spice: Turmeric).
Remember I am not a doctor and the information I am sharing is to the best of my knowledge and should be followed up in other ways as well. There are citations on the website, but you may wish to read more research papers and definitely talk to NF2 doctors.