What part of the deer does antler refer to? What's the effect?

Selection of velvet antler: many deer, such as red deer, sika deer, reindeer and elk, produce velvet antler, of which two kinds of velvet antler have the most medicinal value. According to textual research, the antler recorded in ancient medical books in China generally refers to velvet antler. According to Li Shizhen's Compendium of Materia Medica, "There are deer everywhere in the mountains. A horse with a sheep's tail, a long head and high feet walks at a high speed. The stallion has horns, and the summer solstice is the solution. As big as a pony with yellow and white spots, commonly known as red deer. " The characteristics are consistent with red deer. At that time, the so-called velvet antler should be red velvet antler. Pilose antler is generally harvested before ossification, and blood antler is the best.