Oh, doesn’t cross brain/blood barrier. Too bad. I hope the neighbor can do some alternative options. Sad about the son being mad at you. Covid/vaxes have really caused a lot of family dissension.
A major parasite cleanse is likely in order at a fundamental level for your neighbor. The energy suckers must be removed first as a foundation for healing.
Then it kills something that does because Fenbendazole (same family/type) got its start when the Merck researcher self medicated her glioblastoma into being gone (in the Joe Tippens story)