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BULA!
For those who are interested in studying pharmacological chemistry of kavalactones, here are sources for Yangonin, Methysticin and Kavain:
http://www.lktlabs.com/products/Yangonin-714-33.html
http://www.lktlabs.com/products/Kawain-710-0.html
http://www.sigmaaldrich.com/catalog/product/fluka/80488?lang=en®ion=US
http://www.lktlabs.com/products/Yangonin-714-33.html
http://www.lktlabs.com/products/Kawain-710-0.html
http://www.sigmaaldrich.com/catalog/product/fluka/80488?lang=en®ion=US