Diosgenin

Wikipedia says it comes from various tubers, including wild yams, and assures me consumption of such foods has no estrogen impact on the body.

Yams are a known source of adrenal support and adrenals are hormone producing organs.

This leads to a potential vegetarian means to promote progesterone production without consuming cholesterol rich foods which my understanding is there are no plant based sources of cholesterol per se.

Diosgenin: fancy word for active ingredient in yams. Let's sound scientifically intimidating while making sure no one knows what we are actually saying so we sound like we deserve our big salaries.