Why is Starbucks Brewed Coffee so high in caffeine content?
Was looking online and saw that
McDonald’s Caffeine 185 mg - 21 oz
Starbucks Coffee 310 mg - 16 oz
Dunkin 270mg - 20 oz
Starbucks is Quite Higher. Any opinions on this? Is that why Starbucks is popular, due to high caffeine levels? My stomach gets an ache when I drink Starbucks.