anthocyanins are a broad family of natural food colorings, they're what gives the berries their color. As for bio effects you can draw a nice graph of anthocya

anthocyanins are a broad family of natural food colorings, they're what gives the berries their color. As for bio effects you can draw a nice graph of anthocyanin yield vs certain mold infections and some molds clearly can't grow in anthocyanins. The "industry" doesn't have a unified voice so on one hand the "lets market a concentrated extract as a super-bioreactive kinda-like an antibiotic but for mold prevention" is not coordinating with "lets enter the lucrative supplement marketplace which much like patent medicines a century ago promises everything to everyone". And a third group wants to sell the concentrated extract as a totally safe natural organic food coloring. Needless to say the regulators are freaked out that the same substance is being marketed as both a completely non bio active colorant, a patent medicine supplement of vague goodness, AND as a food color. So there is much legal freakout and in EU you can use blueberry juice as a food colorant or flavoring but not concentrated anthocyanins refined from blueberries as a food coloring, and/or its allowed in the USA I just can't remember.