Protected: Caffeine Basic information about caffeine, including common sources, recommended amounts and bodily effects This content is password protected. To view it please enter your password below: Password: ReferencesFood and Drug Administration - “Spilling the Beans: How Much Caffeine is Too Much?”Harvard T.H. Chan School of Public Health. - “Caffeine.”Higgins et al - “Energy Beverages: Content and Safety”Medline Plus - “Caffeine”Medline Plus - “Caffeine in the diet”Princeton University: University Health Services - “Caffeine”