Oh yeah... here. I don't know what's up with the Boosts, but I'm sure you could just toss in a Centrum to no ill effect. I just eyeball the ratios and blend on high until it looks done. Really simple (especially if you just get a carton of pineapple-orange juice and use that), and the only prep is really freezing the bananas (which isn't entirely necessary, anyway).

Mmm... citrus squeeze...