This page discusses dioxin, especially TCDD, a toxic contaminant in agent orange linked to cancer and birth defects in animals, with potential human risks according to the EPA. While exposure has drop...This page discusses dioxin, especially TCDD, a toxic contaminant in agent orange linked to cancer and birth defects in animals, with potential human risks according to the EPA. While exposure has dropped since the mid-80s, trace levels persist in human blood. Notably, some research suggests TCDD might offer protective effects against certain diseases, as it can suppress allergic encephalomyelitis in mice.