I make these smoothies several times a week. I call it "brain juice." The name came into existence last year when I was trying to persuade my children to try it. I told them it would make them smarter and called it "brain juice." Guess what? They all drink it and sometimes request it! I think I found this on a Men's Health post and adapted it slightly.
1-1/2 cups frozen blueberries
1 cup carrot juice
1 cup spinach (my children don't know about this ingredient)
1 cup vanilla flavored yogurt
Blend until smooth.