If you hear of any good ones, please let us know. But, the answer is not all that clear cut. You see, there are different levels of anthocyanin in different cultivars of blueberries. There is a misconception that the Wild or lowbush blueberry contains more than the highbush. This is not true.
Some highbush blueberries have very high levels of anthocyanin and some less.
The same is in the lowbush. Here is a good rule for this determination made on totally unscientific calculations. What is the difference in the content of polyphenol between US and European cultivated blueberries, if there is. This is not a common occurrence, and we get this question every few years and from different regions of the country. Blueberries and other ingredients used in filings are grown in nature.