evidence: "You've probably heard of the 'Made 100% from plants'... Well, (the Impossible Burger) contains 44mg of estrogen," reads a tweet shared in an Aug. 26 Facebook post. [...] In the original article, Stangle asserted the 44 mg of estrogen contained in Burger King's Impossible Whopper – which uses the Impossible Foods patty – was "18 million times" greater than the "2.5 (nanograms)" in the regular beef whopper. [...] - NIH National Library of Medicine, accessed Sept. 9, Isoflavone - Iranian Journal of Public Health, Feb. 11, 2015, Hormones in Dairy Foods and Their Impact on Public Health - A Narrative Review Article - Impossible, Aug. 27, Soy: Facts, Myths and Why It's In Our Products - UCSF Transgender Care, June 17, 2016, Overview of feminizing hormone therapy - Hormone Health Network, accessed Sept. 9, Estradiol - Health Feedback, Jan. 10, 2020, Impossible Whopper contains no estrogen; will not lead to men growing breasts if eaten in moderation - AACE Endocrine Practice, May 1, 2008, An Unusual Case of Gynecomastia Associated with Soy Product Consumption - Nutrition Action, Jan. 7, 2015, How to Diet: Does Soy Impact Masculinity?