15 01 11
Here is a growing list (best start at 2004) of data/reports on studies generally, and focused on Oligomeric ProanthoCyanidins OPCs, a subclass of Flavanoids, components in many foods as catalogued by USDA and reported in tables available at the US Department of Agriculture.
OPCs are commonly available in tablet form like vitamins as extracts from two primary foods: grape seeds and pine bark, the latter often carrying the name pycnogenol, a name invented by the French scientist who innovated the discovery and extraction of OPCs, Jacques Masquelier. Otherwise, there are several foods with elevated concentration of this natural nutritional gift, increasingly the focus apropos better health.
2015 01 10 Database Report from USDA Flavanoid Database September 2014 (extract from more general June 2013 data)
2015 01 11 review and hi-lite of June 2013 USDA Flavonoid Content of Selected Foods version 3.1
Outstanding question: Why no longer report specific occurrence of dimers and trimers as accomplished in the 2004 Table?
2013 06 USDA OPC Content Report and unfortunate obfuscation / replacing references to "dimers and trimers" with, albeit synonyms, less memorable, and less significant taxonomic/molecular variations. This version 3.0 is now updated to version 3.1 above.
2011 USDA Table of Foods Flavonoid Content
2006 USDA - OPC content in chocolate options
2004 USDA Table of Foods ProanthoCyanidin Content (john annotated)
_________ In the literature:
references: rapidly increasing, yet to compile reports on beneficial anti-cancer for: breast, prostate, adrenal, leukemia