no other research chems... daily basis i've been on multi-v, fish/flax oil, milk thistle, hawthorn berry, saw palmetto, then just protein supps kre-alkalyn, an NO product.... i've been bulking so i'm eating a lot but that has never caused me stomach problems. i feel like i take a dump hourly right now... i have a friend that started the same day i did and he's having bad stomach problems as well... never heard off this as a side effect from letro that's why i'm wondering. i know it's working because my gyno has gone done a considerable amount in the 5 days i've used it. i just wish i didn't **** so damn much.