I have been making a lot of cheese myself and I have a lot of whey left over. I first make ricotta, but some cheese leaves none behind. I feed some of the whey to our dog. It makes his coat shine wonderfully and he loves it. It is a great substitute in almost any recipe calling for milk. I find the breads rise higher and are lighter than using milk. I am still experimenting with ways to se it. but I loath throwing it away. I am even testing it in my garden yo see if that works. Don't know the results yet.