Blueberry juice concentrate is made by removing water from fresh blueberry juice. This process leaves behind a dense liquid that still carries many of the polyphenols from the whole fruit, including anthocyanins and flavonols.
People mix a small amount, usually 1 to 2 tablespoons, into water, smoothies, or other drinks. You can take it any time of day, with or without food.
Some use it as an easy way to support antioxidant capacity or to back cognitive and urinary tract health. Current evidence for these benefits is modest and not yet firm.