There are some common foods and drinks that contain caffeine naturally:
Per cup, green tea contains 25-30mg of caffeine, black tea contains 20-50mg while herbal teas do not contain any caffeine.
In dark chocolate, it contains roughly 12mg per ounce, while milk and white chocolate have far less.
Depending on the kind and method of brewing, per cup of brewed coffee contains around 95-200mg of caffeine.
Guarana berries contain 20mg of caffeine per berry.
Matcha, a powdered green tea, contains 30-50mg of caffeine per cup.
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