The History and Applications of Pine Pollen
In adding to the general richness of the long history and historical use of Pine Pollen in ancient China, I want to share with you this informative--and highly campy--video. I highly recommended a watch if you are at all interested in it. Its short, its entertaining, and you might even glean a little information from it.
With all of the research I have done (which is a lot), the information in the video seems spot on, but I cannot confirm the links of Pine Pollen to Chinese Emperors. You'll have to take that with a pinch of (Himalayan) salt and file the away that knowledge in the folklore-but-possibly-true file.