Palmitoyl ethanolamide-d4 (PEA-d4) contains four deuterium atoms at the 1,1′, 2, and 2′ positions. It is intended for use as an internal standard for the quantification of PEA by GC- or LC-mass spectrometry. Palmitoyl ethanolamide (PEA) is an endogenous cannabinoid found in brain, liver, and other mammalian tissues.1 PEA has also been isolated from egg yolk, and found to have anti-anaphylactic and anti-inflammatory activity in vitro.2 PEA is an endocannabinoid which has been shown to significantly elevate cAMP in cells expressing CB2 receptors. However, its affinity for CB2 receptors is relatively low, at about 10 µM. CB1 receptors have no appreciable affinity for PEA.3WARNING This product is not for human or veterinary use.