Black tea — 1 cup (237 ml) contains about 47 mg of caffeine.
Instant coffee — 1 cup or 8 oz (237 ml) contains about 60 mg of caffeine.
Espresso — 1 shot or 1.5 oz (44 ml) contains about 65 mg of caffeine.
Brewed coffee — 1 cup or 8 oz (237 ml) contains about 95 mg of caffeine.
Guarana — This seed originates from South America, and it is used as an extract in food, energy drinks, and energy supplements. Coffee beans have about 4 times less caffeine than guarana beans. Some drinks that contain guarana extract can have up to 125 mg of caffeine per serving.
Energy drinks — 1 cup or 8 oz (237 ml) of an energy drink holds about 85 mg of caffeine. But the standard energy drink serving is 16 oz (473 ml), and that doubles the caffeine to 170 mg. Because energy shots are more concentrated than drinks, a small 2-oz (59ml) shot holds about 200 mg of caffeine.
Supplements — Caffeine supplements contain about 200 mg per tablet as if you had drunk 2 cups (473 ml) of brewed coffee.

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