Eddie, I brought home a suitcase full of it from China, but I've yet to find a source here in the states, but I'm sure it can be found. There is a product available in the USA that has an herbal mix, which contains Berberine. The product is called "Goldenseal".

A 6 month supply of Berberine HCL from China was only $28 usd... Typically, you can expect to find an equivalent product here in the USA for about 6 times the price you'd pay in China. My source was a wholesale herbal medicine market located in Xi'an, China...

There's a Chinese Exporting company in Hong Kong that can export Berberine, so I would presume there must be an American Herbal Supplier that could order and sell it...