What I have learned from having a Vivelle Dot estrogen patch for the past two years is that the source of their estrogen is either soy or yams, most likely soy because it is cheaper. When I contacted the manufacturer Novartis, they said soy is their main source of estrogen for their patches. My doctor says there are no patches made specifically with yams instead of soy. Because I regularly show an allergic reaction to soy, I suspected that my patch was giving me problems, but I now believe my

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