Melatonin a phytoestrogen?

Well, that would be a bummer. I have also been taking it.

I've heard nothing but good things about melatonin for ER+ BC.  Some work suggests it even enhances the effectiveness of anti-hormonals such as tamoxifen.  It appears to upregulated the number of ER+ receptors on cells, which is a good thing.  It reduces circulating estradiol levels.  When combined with chemo there is research showing it improves tumour response, when combined with taxols it reduces neuropathy.  Women who are deficient in melatonin have higher incidences of BC, such as shift workers.  Recent research shots it has anti-angiogenic properties, which suggests it might slow the growth of tumour by limiting blood supply. Sorry i don't have time this am to dig up the articles, but I've posted many of them here on bc dot org.