Can Phytoestrogens Be Taken with Tamoxifen in Breast Cancer?

Currently I am taking tamoxifen and megace following surgery for breast cancer. In the interests of raising my libido, can I take a supplement containing phytoestrogenic compounds?

Currently, various research evidence shows both that plant estrogens are protective against estrogen-dependent diseases like breast cancer, and that plant estrogens can stimulate the growth of estrogen-dependent tumours. Until there is conclusive clinical evidence, I advise you to avoid phytoestrogens.