Plant lignin produced from the Norway spruce a species of spruce native to Central and Eastern Europe. Lignan consumption supposedly increases blood levels of enterolactone that in turn reduces estrogen levels in men via several mechanisms.
Also known as: 7-hydroxymatairesinol, Hydroxymatairesinol
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Media
https://www.lifeextension.com/magazine/2008/1/report_lignans/page-01
https://www.lignans.net/hmr-lignans.html