An upstate New York coffee shop is boasting that it has the “world’s strongest coffee” called “Death Wish,” with 200 percent more caffeine than the average cup of joe. But many are wondering, is it safe to consume?

“This is not your regular morning coffee,” the Death Wish Coffee website boasts. “This is not your store bought coffee. You will not find this coffee at your local diner or at your sissy Starbucks. Death Wish Coffee is the most highly caffeinated premium dark roast organic coffee in the world. This is Extreme Coffee, not for the weak. Consider yourself Warned.”

Death Wish Coffee said it has found a coffee bean with 200 percent more caffeine than the average coffee shop’s beverage. By comparison, a 12-ounce cup of coffee at Starbucks contains 260 milligrams of caffeine, according to EnergyFiend. Death Wish’s coffee, though, contains double that amount, clocking in at 520 milligrams of caffeine.

“I had customers come in and say, ‘give me the strongest cup you got,’ and they wanted a darker roast,” Death Wish owner Mike Brown told Yahoo! Shine. “I did some research and I blended the strongest beans in the world from Indonesia, Ethiopia and South America.”

The beans are roasted to medium-dark for a “strong and robust flavor” before it is ground up to the proper level for extreme potency, the website said.

“Usually the lighter the roast, the more the caffeine,” Brown said. “But most coffee drinkers prefer a darker roast. This is medium-roast so it has more flavor than other highly-caffeinated blends.”

For those curious enough to try what has been billed as the “world’s strongest coffee,” Death Wish sells the coffee online for $19.99 on their website and on Amazon.com.

“We … guarantee that you will not find a stronger, more flavorful, organic coffee on the market anywhere or we will buy the coffee back from you,” the company said. “This is the best coffee for the strong.”

Some, though, are unimpressed by the coffee’s percolation, though; One commenter on Amazon wrote: "I've had stronger coffee with more caffeine elsewhere.” Another wrote: “much to my dismay this is just regular coffee".

But many are wondering, is consuming a beverage with this much caffeine safe?

Most recently, a review published in The Journal of Clinical Pharmacology determined the median lethal dose of caffeine, ingested orally, is approximately 100 mg to 200 mg per kg of mass.

However, Death Wish’s owner said that while the shop’s coffee isn’t for everyone in terms of intensity, it’s perfectly safe.

“The entire back label of the bag of coffee is a warning label. If you have medical issues like heart problems you shouldn’t drink this stuff,” Brown told Yahoo.

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