Will try to order some. This is listed on Amazon:
"Suggested Use: Take one mint and wait 30-60 minutes before taking an additional mint, depending on your energy needs.
WARNING
Do not exceed 5 servings of Viter Energy per hour. Do not exceed 10 servings of Viter Energy per day.
Do not take if you are pregnant, nursing, under 18 years of age, or sensitive to caffeine."