Does Isoflavones / SoyLife® have any negative influence on breast cancer?

It was observed in a recent study, as a second outcome from the OPUS study, that daily supplementation for two years with 80-120 mg of soy hypocotyl isoflavones does not cause adverse effects in healthy menopausal women and can be regarded as safe.

In vitro and animal tests with highly, sensitized models, genistein only has shown adverse effects on breast cancer mechanisms. These effects have not been confirmed in any human research.