Tamoxifen and topical phytoestrogens

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I just purchased an anti aging serum and noticed there are phytoestrogens in the serum. Thepharmacists do not seem to know this answer, nor does my oncologist. Is it okay to use this serum daily? I have been doing great avoiding as much soy in my diet as I can but the phytoestrogens are from Glycine soybean Sterols.

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