Vanilla Milk Recipe

I had to do a little Makayla blog to remember another story. She was excited one day to come home from school, she says, "Mom, my friend Kamryn gave me her milk carton." I asked why she wanted an empty milk carton. She said, "Because Vanilla milk is my favorite and this one has the recipe on the back. What does C-A-L-C-I-U-M spell."