VDHP is a recently discovered endocannabinoid that acts as a CB1 agonist. VDHP actually has a higher affinity for CB1 than any other true cannabinoid, this justifies VDHP being classified as an endocannabinoid. VDHP strongly suppresses pain sensation and lowers arterial blood pressure and therefore has considerable therapeutic potential.
http://en.wikipedia.org/wiki/Hemopressin
VDHP is a breakdown product of hemoglobin.