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Setchell, Kenneth DR, Xueheng Zhao, Pinky Jha, James E. Heubi, and Nadine M. Brown. The Pharmacokinetic Behavior of the Soy Isoflavone Metabolite S-(−)equol and Its Diastereoisomer R-(+)equol in Healthy Adults Determined By Using Stable-isotope-labeled Tracers(1)(2)(3)(4). American Society for Nutrition, 2009.

Setchell, Kenneth DR, et al. The Pharmacokinetic Behavior of the Soy Isoflavone Metabolite S-(−)equol and Its Diastereoisomer R-(+)equol in Healthy Adults Determined By Using Stable-isotope-labeled Tracers(1)(2)(3)(4). American Society for Nutrition, 2009.