I use natural remedies a lot because of badexperience with traditional treatments. Iused Sambucoloncefor immune system, but unfortunately he was too far goneby the time I tried it, so I can't say for sure if it would work onsomething milder. It is sweet though so use with care.
Tea Tree oil is a favorite for treating cuts, scrapes, and otherwounds. It's a powerful disinfectant/antiseptic for external injuries.It also is a powerful flea repellent, but can mildly irritate skin asit is potent.
Blackberries/leaves work for diarrhea, but the leaves need de-spiking first. Oatmeal also helps that.
Papaya is supposed to be good for parasites, but haven't tried it yet.
As far as nutritional supplements, I don't really use those, so can't help you there.
Good luck!
Rose