There have been many women who have ascertained that soy has a convinced effect on hot flashes, whereas many others say that that there is not any beneficial effect. If you try it and it works for you that is really all that matters. If it does not work for you then it is on to something else. Every woman is so different it is a trial and error method when finding natural remedies. It has been indicated that women who ate 60 grams of soy protein per day had a 45% reduction in hot flashes after 12 weeks. You get the right amount of soy intake from approximately 1 cup of soymilk, or ½ cup of soy based tofu, ½ cup of tempeh, or a ½ cup of green soybeans or three handfuls of roasted soy nuts. All of them work just as well as the others, so it will have to be a personal preference of what you prefer.