Identification and stereochemical characterization of lignans in flaxseed and pumpkin seeds. (whfoods.com)
Identification and stereochemical characterization of lignans in flaxseed and pumpkin seeds. (whfoods.org)
Which is at least partially true, as nettle root contains lignans which bind to SHBG, interfering its testosterone and estradiol (E2) hunting. (supernutritionlife.com)