Correction: The phytoestrogen in flax is thought to be a factor in hyperplasia (thickening of the uterine lining), not endometriosis.
I have recently learned that flax seed/oil contains a phytoestrogen that can cause problems in reproductive development and can be a factor in endometriosis. Flax seed is very common is kibble and I have only found a few that don’t have it. I’ve also heard that rosemary which is also commonly used as preservative is also contraindicated for reproductive females.
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