Westend61/Getty Images. The Food and Drug Administration (FDA) maintains that an upper limit of 400 milligrams is the upper daily limit, above which it may cause side effects or health problems
The amount of caffeine in tea or coffee can vary significantly depending on the origin, type, and preparation of the drink ( 11 ). Tea leaves contain 3.5% caffeine, while coffee beans have 1.1–2 Summary. The best time to drink coffee is thought to be 9:30–11:30 a.m. when most people’s cortisol level is lower. Whether this is true, remains to be determined. Caffeine can increase m1gFQ. 65 38 169 301 40 28 84 204 107