Written by: Otesa Miles and Emily Downward | Last review date: August 2019
- Food sources of caffeine. Dietitians of Canada. https://www.dietitians.ca/Your-Health/Nutrition-A-Z/Caffeine/Food-Sources-of-Caffeine.aspx. Accessed 5/3/18.
- Does caffeine trigger or treat headaches? National Headache Foundation. Available at https://headaches.org/2009/07/24/does-caffeine-trigger-or-treat-headaches/. Accessed 5/3/18.
- Caffeine: how much is too much? Mayo Clinic. Available at https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/in-depth/caffeine/art-20045678. Accessed 5/3/18.