[surferjoe2007]

Fenugreek, shatavari and I think maca deregulate hormone activity, increasing the effects of existing hormones and thus tend to be the main part of most programs. Some herbs such as fennel provide prolactin; these also tend to be popular for lactation. Some are for progesterone. Some such as saw palmetto reduce DHT, the stronger testosterone. Some provide nutrients, raw materials, such as MSM or omega 3s. Increasing insulin sensitivity such as cinnamon (bark or leaf) or cloves, and increasing HGH production (e.g., L-arginine or a food source of it) plays a smaller role. AFAIK for actual phytoestrogens they compete with each other and with real estrogen, and can saturate receptors so that there's no more room left, so it is more effective to have the strongest type rather than a large amount.