Ugh...I bought my rats Kaytee blocks because it was the only lab block I could find on the market (if you can even call it a lab block...I use the term loosely) in my area. I read the ingredients the other day, and I felt like a bufoon; the first one is corn and following soon after is alfalfa. A lab block is supposed to be a complete diet, and this one is far from complete. And the price is terrible, by the way. LoL, sorry, my rant is over...just hoping to prevent somebody else from making the same mistake that I did.