Angel blood is technically the blood of an angel's human vessel like demon blood, It's unknown if it contains any supernatural properties. It's in the form of a contraction from an occupied angel's vessel. If like demons, angel would possess their vessel's blood routes and canals. The presence of an angel may change the blood somewhat as Castiel is unable to use his own blood in a ritual that requires human blood and his blood as a Fallen Angel proves to be part of the Bone Of Righteous Mortal Washed In the Three Bloods of Fallen that can kill a Leviathan.
- Season 4
- Season 5