The world's strongest coffee has been created with a health-warning limit of two cups a day.
The beverage has four times as much caffeine as normal full-bodied blends, the Sun reported.
New York cafe owner Mike Brown, 31, has claimed that robusta beans brew with skull and crossbones on packets is the most potent for buying.
He joked that the coffee is not made for weak people and may lead to sleepless nights.
Mike, who has been running a coffee company for six years, came up with the idea, after encountering costumers who craved a stronger caffeine hit.
