Black Insomnia is the world’s strongest coffee. Doctors discourage consuming more than 400mg of caffeine in a day, which is equal to about 4 cups of regular coffee, 10 cans of soda, or 2 ‘energy shot’ drinks- but drinking a cup of Black Insomnia would give you almost double that amount, because just one 12oz serving has 702mg of caffeine. Source Source 2 Source 3