- Type
- Phyto-oestrogen
- How serious
- Moderate severity
- Evidence
- Moderate evidence
Why it is flagged
Can interfere with thyroid hormone synthesis when iodine intake is low, and high intakes are debated in PCOS and fertility contexts.
Health topics it bears on
Sources
- Soybean Extracts and Isolates Health Canada (Natural Health Products Ingredients Database), 2026
- Risk assessment for peri- and post-menopausal women taking food supplements containing isolated isoflavones European Food Safety Authority, 2015
- Effects of Soy Protein and Soybean Isoflavones on Thyroid Function in Healthy Adults and Hypothyroid Patients: A Review of the Relevant Literature Thyroid (American Thyroid Association journal), 2006
Also listed as
genistein, daidzein, glycine max extract, soy extract, isoflavones