Fancy Vitamin Drink!

I have to wonder, how exactly do I know the vitamins allegedly housed in the cap of this bottle are actually legit?
Weird, but cool.  Has anyone tried this before? It was the first time I had seen it, the taste is actually pretty good.  But to be real, I struggled with the dang cap for like 5 minutes before I figured out how the stupid thing worked.  By the time I got it open, I was almost over it.