I have been taking Promensil (an isoflavone supplement) and phytoestrogen rich foods (soy, red clover tea, flaxseeds) for a year now. They have made a huge difference to me (I am 46 and peri). However, like all oral oestrogens, they reduce natural testosterone and hence affect libido. I added Tostram but my GP said I could not take Tostram long term (even though it gave me back my libido and was a good combination with my dietary estrogens). Therefore, I am switching to combined HRT in the next month and plan to ditch the isoflavones (which cost about £15-£25/month, depending on dose you take). But to answer your question, I am a fan of Promensil and diet to boost oestrogen levels naturally. They work.