Piper methysticum (Kava) is a plant that grows in the pacific. It has sedating, anti-anxiety, and muscle relaxant properties. People have been using it for at least ...
Yangonin is one of the six major kavalactones found in the kava plant. It has been shown to possess binding affinity for the cannabinoid receptor CB 1 (K i = 0.72 μM), and selectivity vs. the CB₂ receptor (K(i)>10 μM) where it behaves as an agonist.
In short, it has a proportionately higher level of Kavain, one of the key lactones thought to be responsible for the pleasurable effects of Kava (it encourages dopamine release in the brain), while conversely having a low level of yangonin, which counteracts the pleasurable effects of Kava by inhibiting dopamine release.
This from the "Kava: The Pacific Elixir" 1= Demethoxy-yangonin (DMY) 2= Dihydrokavain (DHK) 3= Yangonin (Y) 4= Kavain (K) 5= Dihydromethysticin (DHM) 6= Methysticin (M) "The first three kavalactones in the code usually represent over 70% of the total." Apparently the first 3 can be equal or almost equal in concentration.