Do soy isoflavones impact testosterone in men?

Soy foods and soy isoflavones have been studied a number of times and have not been found to impact testosterone in men.* As is the case with most compounds found in the diet, it can be useful to think in terms of amount rather than good or bad. The SoyLife® Soy Germ Extract used in Qualia Skin contains soy isoflavones in an amount that would be found in the Japanese diet, which has a reputation of being one of the world’s healthiest cuisines for both men and women.

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