A company tried this, selling ice cream made from breast milk a fee years ago. They got shut down by the government, I believe FDA, even though they processed the milk like companies do with cow milk etc.
Add on info: it was a London company in 2011. You could get a cone for 11 pounds. It was outlawed. The FDA used that to remind everyone that it was illegal and to check the rules for sharing established much like a blood bank rule set up.
I hear it's really good in coffee. I suspect it's only used in tiny amounts, would think that excess human breast milk would best be used for feeding babies. In any event perfectly good food, we are designed to exist on it. Now baking with Moon Blood, pass.