Should Silymarin Be Avoided In Person With History Of Estrogen Based Cancer?

Dr Prasad answered a question about LivLean #1 and said not to use it if there is a history of estrogen based cancer...is that because of the silymarin? Or because of the other ingredients: Burdock Root, turmeric, yellow dock root, n aceytl cysteine (sp?), artichoke leaf extract, or selenium? Thank you for this free information.