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Total Plants: 24
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Plant Low PPM High PPM StdDev *Reference
Coptis spp Rhizome -- -- *
Phellodendron amurense Bark -- -- *
Mahonia aquifolium Plant -- -- *
Berberis vulgaris Plant -- -- *
*Unless otherwise noted all references are to Duke, James A. 1992. Handbook of phytochemical constituents of GRAS herbs and other economic plants. Boca Raton, FL. CRC Press.