“DT56a has anti-estrogenic properties in the breast tissue…”

Pharmacological Doses of the Natural Phyto-SERM DT56a (Femarelle®) Have No Effect on MCF-7 Human Breast Cancer Cell-Line

As expected, estradiol treatment at the pharmacological dose resulted in a substantial cell growth.
Unlike estradiol, DT56a treatment at pharmacological doses did not produce any measurable proliferation. The dose response curve showed a minor growth only at mega-doses of 66,000 times the pharmacological dose (6.6 × 104) of DT56a, which was significantly lower than that observed in the estradiol-treated cells.

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