Myth. There's much more estrogen in dairy. Milk is packed with hormones. It comes from a female cow after giving birth for heavens sake.

"The bullets from handguns."

"Myth. There's much more 'bullet' to a rifle round."

Just because there may be more estrogen in milk, how does that take away from the estrogen in soy?

Soy doesn't contain estrogen, it contains phytoestrogens. This is a common misunderstanding.

Phytoestrogens include isoflavones in soy, which can have a wide variety of effects, (including decreasing estrogen levels) depending on gut flora, age, sex, hormone levels https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3074428/