evidence: Hydrogen peroxide given intravenously can be dangerous, has no known medical benefit [...] A video uploaded to Facebook by astrologer and former radio talk show host Farley Malorrus, who has more than 16,000 followers, claimed that intravenous hydrogen peroxide "enables the body to cure itself of practically any disease, without drugs, without surgery, chemotherapy". The video received more than 14,700 likes and more than 7,200 shares. [...] Overall, while hydrogen peroxide is useful for disinfecting inanimate objects and can be used externally, such as for teeth whitening under a dentist’s supervision and as an occasional mouthwash, there’s no evidence that using hydrogen peroxide internally can treat "practically any disease" and plenty of evidence showing that injecting or ingesting it can cause serious harm.