Late reply, but during molt I start throwing black oil sunflower seeds out, cooking up oatmeal and mixing in ground beef. That's just my way of increasing protein without getting soy protein in the eggs.
I don't know any numbers, but from experience (being sensitive to soy), any food made with commercial, store bought eggs is enough to trigger an allergic reaction. It's probably going to depend on the severity of your reaction to soy, as well as your type of reaction (headache, hives, etc). If...
That's exactly where I get my feed from. Delivered to the Wegman's parking lot, first Thursday of the month for $6.
I am Celiac, and in my research, I've read that the chickens are able to break down the gluten proteins, so they are not in the eggs. With the soy proteins, they are not able...
I posted this in another thread, thought it would go well in here. I am allergic to soy (and gluten), and thought that I was allergic to eggs. Through some random internet searching, I came across an article (linked below) about soy proteins being found in eggs. Additional research allowed me...