More on soy I posted on Mens group, how much soy is good and how much is too much?

Phytoestrogens act to block estrogen receptors when taken in smaller amounts. Phytoestrogens are plentiful in soy and are commonly called isoflavones. These fill the estrogen receptor up but they don’t do the work of estrogen, so it can take on an anti-estrogen effect. Basically, blocking estrogen receptors would prevent estrogen from doing too much, which in men you don’t want too much effect from estrogen. But it seems too much soy and it can contribute to estrogenic effects, or act like a flood of regular estrogen.

The summary is that basically soy can have both estrogenic and anti-estrogenic effects. At low doses, they can block estrogen receptors, potentially reducing estrogen's impact, especially in men. However, higher doses of soy may mimic estrogen and lead to estrogenic effects

But how much is the right amount for benefit and how much is too much?

How much soy is enough for benefit but not too much – 25 grams a day is max according to this article:
https://www.health.com/is-soy-bad-for-you-11725145