A study published in the journal Nutrition Research found that blueberry powder improves immune and cardiovascular functioning. During the study, participants received a powder equivalent to 250 grams (about half a pound) of blueberries per day. After six weeks, researchers observed a 4% increase in the immune system’s natural killer (NK) cells. They also observed heart benefits, in particular a reduction in arterial stiffness. While other research has shown that blueberries have a wide range of positive health effects, such as reducing the risk of cognitive decline, this is the first study to directly examine blueberry consumption and NK cell count in humans.

Source: NutraIngredients-USA