One The Original Donut Shop K-Cup often lands around 90–120 mg of caffeine in an 8 oz brew, with some pods trending higher or lower.

A decaf Starbucks latte still contains caffeine, often in single-digit milligrams, with the total shifting by size and shot count.

Most diet sodas land around 30–50 mg of caffeine per 12-oz can, while caffeine-free options sit at 0 mg.

A 12-oz can of Diet Pepsi contains 35 mg of caffeine, while a 16.9-oz bottle contains 50 mg.

A 12-oz can has 54 mg of caffeine, while a 20-oz bottle has 91 mg.

A 12-oz Diet Coke has 46 mg of caffeine, while an 8-oz brewed coffee often lands near 95 mg.

A 12-oz can has 41 mg of caffeine, while a 20-oz bottle has 68 mg; the number changes with serving size, so the label is the final word.

Most decaf coffee still has about 2–10 mg of caffeine per 8-oz cup, with espresso and some pods sometimes landing higher.

Most decaf coffee lands around 2–5 mg of caffeine per 8 oz cup, with espresso-style drinks and strong brews sometimes running higher.

For most adults, more than 400 mg of caffeine a day starts to raise the odds of side effects, poor sleep, and shaky jitters.