Soy concerns

I've been reading various things about the worries for males with the estrogen in soy products. Anyone have any opinions/experiences with this (preferably dudes who aren't super bulky since they wouldn't really notice bosom growth since they have large pecs) and how much soy is too much? I work a manual labor job so i try to get a 25-30g protein hit every few hours and it's hard to get at things other than just a protein bar/shake.

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