SR, other than a vague reference to oats regulating estrogen, from your herb link, you've lost me on any similarity between oats and proviron. There doesn't seem to be much of a connection in the mind of the scientific world either as I can't find any scientific studies along the lines of avena sativa/oats/wild oats/strawoats and an effect on either testosterone or estrogen. I think you're way out on a thin limb.
There are many natural products from nature that work. And they are generally well documented... if they work. If they don't work, then the benefits are just thrown out there and only the gullible believe them. Unless you have scientific studies confirming the abilities of some natural plant, I chalk up most of the talk by the nature lovers to be the equivalent of what they feed their plants.
Best,
MaxRep