Crazy Texas used coffee grounds idea:

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Caffeic acid belongs to a family of compounds called polyphenols, which are plant-based compounds known for their antioxidant, or free radical-scavenging properties. Caffeic acid is unique because it can penetrate the blood-brain barrier and is thus able to exert its effects upon the cells inside the brain, Narayan said.

The process the team uses to extract CACQDs from used coffee grounds is considered "green chemistry," which means it is environmentally friendly. In their lab, the team "cooks" samples of coffee grounds at 200 degrees for four hours to reorient the caffeic acid's carbon structure and form CACQDs. The sheer abundance of coffee grounds is what makes the process both economical and sustainable, Narayan said.
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more here

https://www.news-medical.net/news/2...may-be-found-in-used-coffee-grounds.aspx