[Siman234]

From what I understand from searching and reading various things...

Most USP Progesterone started out as yams, and were processed to get the pure, bio-identical, micronized Progesterone out of them for use in other things.  However, there are some supplements that are using a component of yams, which evidently has some or is similar to USP Progesterone, just unprocessed, and those supplements are not nearly as strong as the ones containing USP Progesterone.  This is probably adding confusion as I think it all, or at least much of it, starts as yams--USP Progesterone is never going to be made from any human components.

It seems like a mess, but for now, I'll just order the Smoky Mountain stuff since they have two progesterone cream products, one clearly labelled as Wild Yam and the other not, and because Lotus has recommended it for the past few years it seems.