Red grapes, blueberries may enhance immune function

... pterostilbene from blueberries. Both of these compounds, which are called stilbenoids, worked in synergy with vitamin D and had a significant impact in raising the expression of the human cathelicidin antimicrobial peptide, or CAMP gene, that is ...

http://medicalxpress.com/news/2013-09-red-grapes-blueberries-immune-function.html