Heinonen S.M., Wahala K., Adlercreutz H. (2004) Identification of urinary metabolites of the red clover isoflavones formononetin and biochanin A in human subjects. J Agric Food Chem 52:6802-9 PubMed (15506819)

Compound Mean content
Daidzein 3.2 mg/supplementation
Genistein 5.2 mg/supplementation
Biochanin A 84 mg/supplementation
Formononetin 51.7 mg/supplementation