There's a misconception that yam can turn into progesterone in the body. It needs to be synthesized into progesterone outside of the body. Dioscorea is a diuretic, so it helps with bloating. It's also an antispasmodic so it helps with cramping, two very common symptoms, but it's not helping by raising progesterone levels. You need to supplement with natural progesterone to do that.
Some labels are misleading.
Soy contains beneficial phytoestrogens, which can also be found in flaxseeds and fruits and vegetables. Eating fish can be very helpful, too. The meat you get at a non-healthfood store, unless the meat label says it's from animals that were not fed hormones, then it's not organic. Organic meat is more expensive, but as a health investment, it's worth it. Again, this is a big topic.