Replied by Ted (Bangkok, Thailand)
Dear Thakor: Yes I have heard of cases of people being cured or relieved of malaria on hydrogen peroxide. But other herbal preparations is known in medicine to really help malaria such as wormwood (or artemisia). In Thailand we have this common weed grass called Ya Ka, that seems to cure the entire family of malaria. I suspect that olive leaf taken plenty and in large amounts can also help.
So yes, hydrogen peroxide does help, if you have no other nearby facilities to help you of course. As to how well they work against malaria I cannot say. But the best ways is to always use a DEET mosquito repellent with you when going to countries known to have mosquitoes.