Cinnamon is a spice that can be purchased from different manufacturers. It has been available and used in the food industry for ages. There is no commercial incentive for pharma companies to invest in its research or in promoting it. Research publications are not easily accessible to the general public, although it was published in several websites (in addition to research publications). See:
Brain Food Essentials: CINNAMON,
Cinnamon May Be Fragrant Medicine For The Brain, 2016,
Why Cinnamon May Hold Secrets to Alzheimer’s Prevention, 2014.