First episode of our two-parter on caffeine! For such a small and unassuming molecule, this drug is really popular, consumed all over the world for millennia! What is caffeine? How does it work? We'll even begin to discuss why some people are more sensitive to caffeine than other people.
References:

https://coffeeaffection.com/coffee-cherry/
https://www.sciencedirect.com/science/article/pii/S2214750018303275
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3603218/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1884944/
https://link.springer.com/article/10.1007/s40279-021-01521-x
https://www.nature.com/articles/s41598-019-46931-0
https://link.springer.com/article/10.1007/s41105-020-00276-8
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6947650/
https://www.nature.com/articles/1395880
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3368971