White tea caffeine content varies widely, typically ranging from 6 to 55 mg per 8-ounce cup depending on brewing method and tea variety.

White chocolate contains 0 mg of caffeine per serving because it is made from cocoa butter, not cocoa solids, where caffeine is naturally found.

Plain water contains no caffeine, but commercial caffeinated waters typically contain 45 to 125 mg of caffeine per bottle.

Each Vivarin tablet contains 200 mg of caffeine, which is the amount in a strong cup of coffee and close to half the general daily upper limit for healthy adult

Caffeine levels vary widely by drink and preparation, with an 8-ounce brewed coffee typically containing 70 to 140 mg and most healthy adults.

An 8-ounce cup of unsweet black tea typically contains 40–70 mg of caffeine, while green tea offers 25–50 mg.

Two tablespoons of instant coffee contain approximately 120–180 mg of caffeine, depending on brand and whether the coffee is regular or high-caffeine.

Two standard 8-ounce cups of brewed coffee contain roughly 190 to 240 mg of total caffeine.

Twinings green tea contains roughly 30–40 mg of caffeine per cup, though the exact amount varies by brewing time and water temperature.

A single serving of Turkish coffee (about 60–65 ml) typically contains 50 to 65 mg of caffeine.