[olgaitsuka]

The reason why BO works is because it's a direct source of actual animal-based estrogens.
Humans are animals, not plants, so we use animal-based sex hormones.
Plants only have phytoestrogens, which is plant-based, and even though it works (since it's one of a plant's defense mechanisms), it doesn't work all the way through.
Which is why I still maintain some feminization from years of PM, but at the same time also maintained a mostly male body.