Soybean meal, a common ingredient in laboratory animal diets, contains variable levels of phytoestrogens. These plant-derived compounds mimic the structure and function of estrogens in mammals and can have an impact on research results.
The main phytoestrogens (and their primary sources) include:
- isoflavones (mainly genistein and daidzin, which are found in soybean protein),
- coumestans (mainly coumestrol, which is found in alfalfa), and
- ligans (found in flax and sunflower).
Read more about the physiological effects and research variations that can occur, if diets contain isoflavones.+ Read more