Though the global takeover of Starbucks and an explosion in third wave roasters have greatly improved coffee’s long time 20th century reputation as a dirt-flavored morning clock-punching aid, all the subtle notes of pink grapefruit and ginger in the world won’t erase the fact that plenty of people just use it as a caffeine delivery system. Which is why while some hip brands focus on things like “single-origin,” a few hardcore companies will always pander to the maximum pick-me-up crowd – aiming to conquer the crown of “world’s strongest coffee.” 
 
 Launched in 2016, Black Insomnia, a South Africa-based coffee company, is the most recent brand to claim that title, saying it has scientific proof that its blend is the most caffeinated in the world – with “dangerously high levels of caffeine” as the brand awkwardly boasts. And now, the king of caffeinated coffees is finally available in the US. 
 
 In the ongoing battle for the “world’s strongest coffee” crown, the unfortunately named Death Wish Coffee Company appeared to be the most legitimate previous king. However, according to Grub Street, Black Insomnia says that after an independent analysis of its beans and its competitors’ beans by a lab in Switzerland, Black Insomnia’s coffee was the “clear winner.” Caffeine Informer says Black Insomnia has 702 milligrams of caffeine per 12-ounce cup; meanwhile, Death Wish has 660 milligrams. For the record, both brands offer up more of the mild upper per 12-ounce serving than the 400 milligrams medical experts recommend you consume in an entire day. And to give this whole thing a bit of perspective, a “normal” 12-ounce cup of coffee will only have about 150 milligrams of caffeine. Meanwhile, a can of Coke only has 34 milligrams of caffeine. By comparison, the soda’s basically a sleep aid. 
 
 Though caffeine might be its primary selling point, Black Insomnia also wants customers to know its product is “strictly pure coffee” – apparently achieved from sourcing the most highly caffeinated Robusta beans (as opposed to the more flavorful Arabica beans) – all “without a burnt and high acidic flavor.” Its coffee still offers “a nice walnut and almost sweet taste profile,” the brand writes. 
 
 If all of this talk of super strong coffee has left you pining for a case of the jitters, good news, Black Insomnia is finally available in the US thanks to Amazon. A 16-ounce bag will set you back $19.99 – not a bad price all things considered… assuming you don’t factor in any future medical bills. ||||| Our general interest e-newsletter keeps you up to date on a wide variety of health topics. 
 
 Caffeine: How much is too much? Caffeine has its perks, but it can pose problems too. Find out how much is too much and if you need to curb your consumption. By Mayo Clinic Staff 
 
 If you rely on caffeine to wake you up and keep you going, you aren't alone. Caffeine is used daily by millions of people to increase wakefulness, alleviate fatigue, and improve concentration and focus. 
 
 How much is too much? 
 
 Up to 400 milligrams (mg) of caffeine a day appears to be safe for most healthy adults. That's roughly the amount of caffeine in four cups of brewed coffee, 10 cans of cola or two "energy shot" drinks. Keep in mind that the actual caffeine content in beverages varies widely, especially among energy drinks. 
 
 Although caffeine use may be safe for adults, it's not a good idea for children. Adolescents should limit caffeine consumption. Avoid mixing caffeine with other substances, such as alcohol. 
 
 Even among adults, heavy caffeine use can cause unpleasant side effects. And caffeine may not be a good choice for people who are highly sensitive to its effects or who take certain medications. 
 
 Women who are pregnant or who are trying to become pregnant and those who are breastfeeding should talk with their doctors about limiting caffeine use. 
 
 Read on to see if you may need to curb your caffeine routine. 
 
 You drink more than 4 cups of coffee a day 
 
 You may want to cut back if you're drinking more than 4 cups of caffeinated coffee a day (or the equivalent) and you're experiencing side effects such as: 
 
 Migraine headache 
 
 Insomnia 
 
 Nervousness 
 
 Irritability 
 
 Restlessness 
 
 Frequent urination or inability to control urination 
 
 Stomach upset 
 
 Fast heartbeat 
 
 Muscle tremors 
 
 Even a little makes you jittery 
 
 Some people are more sensitive to caffeine than are others. If you're susceptible to the effects of caffeine, just small amounts — even one cup of coffee or tea — may prompt unwanted effects, such as restlessness and sleep problems. 
 
 How you react to caffeine may be determined in part by how much caffeine you're used to drinking. People who don't regularly drink caffeine tend to be more sensitive to its negative effects. Other factors may include genetics, body mass, age, medication use and health conditions, such as anxiety disorders. 
 
 You're not getting enough sleep 
 
 Most adults need seven to eight hours of sleep each night. But caffeine, even in the afternoon, can interfere with this much-needed sleep. 
 
 Chronically losing sleep — whether it's from work, travel, stress or too much caffeine — results in sleep deprivation. Sleep loss is cumulative, and even small nightly decreases can add up and disturb your daytime alertness and performance. 
 
 Using caffeine to mask sleep deprivation can create an unwelcome cycle. For example, you may drink caffeinated beverages because you have trouble staying awake during the day. But the caffeine keeps you from falling asleep at night, shortening the length of time you sleep. 
 
 You're taking medications or supplements 
 
 Certain medications and herbal supplements may interact with caffeine. Examples include: 
 
 Ephedrine. Mixing caffeine with this medication — which is used in decongestants — might increase your risk of high blood pressure, heart attack, stroke or seizure. 
 
 Mixing caffeine with this medication — which is used in decongestants — might increase your risk of high blood pressure, heart attack, stroke or seizure. Theophylline (Theo-24, Elixophyllin, others). This medication, used to open up bronchial airways, tends to have some caffeine-like effects. So taking it with caffeine might increase the adverse effects of caffeine, such as nausea and heart palpitations. 
 
 This medication, used to open up bronchial airways, tends to have some caffeine-like effects. So taking it with caffeine might increase the adverse effects of caffeine, such as nausea and heart palpitations. Echinacea. This herbal supplement, which is sometimes used to prevent colds or other infections, may increase the concentration of caffeine in your blood and may increase caffeine's unpleasant effects. 
 
 Talk to your doctor or pharmacist about whether caffeine might affect your medications. 
 
 Curbing your caffeine habit 
 
 Whether it's for one of the reasons above — or because you want to trim your spending on coffee drinks — cutting back on caffeine can be challenging. An abrupt decrease in caffeine may cause withdrawal symptoms, such as headaches, fatigue, irritability and difficulty focusing on tasks. Fortunately, these symptoms are usually mild and resolve after a few days. 
 
 To change your caffeine habit, try these tips: 
 
 Keep tabs. Start paying attention to how much caffeine you're getting from foods and beverages, including energy drinks. Read labels carefully. But remember that your estimate may be a little low because some foods or drinks that contain caffeine don't list it. 
 
 Start paying attention to how much caffeine you're getting from foods and beverages, including energy drinks. Read labels carefully. But remember that your estimate may be a little low because some foods or drinks that contain caffeine don't list it. Cut back gradually. For example, drink one fewer can of soda or drink a smaller cup of coffee each day. Or avoid drinking caffeinated beverages late in the day. This will help your body get used to the lower levels of caffeine and lessen potential withdrawal effects. 
 
 For example, drink one fewer can of soda or drink a smaller cup of coffee each day. Or avoid drinking caffeinated beverages late in the day. This will help your body get used to the lower levels of caffeine and lessen potential withdrawal effects. Go decaf. Most decaffeinated beverages look and taste the same as their caffeinated counterparts. 
 
 Most decaffeinated beverages look and taste the same as their caffeinated counterparts. Shorten the brew time or go herbal. When making tea, brew it for less time. This cuts down on its caffeine content. Or choose herbal teas that don't have caffeine. 
 
 When making tea, brew it for less time. This cuts down on its caffeine content. Or choose herbal teas that don't have caffeine. Check the bottle. Some over-the-counter pain relievers contain caffeine — as much as 130 mg of caffeine in one dose. Look for caffeine-free pain relievers instead. 
 
 The bottom line 
 
 If you're like most adults, caffeine is a part of your daily routine. And most often it doesn't pose a health problem. But be mindful of those situations in which you need to curtail your caffeine habit.
– Tired of wimpy cappuccinos and limp lattes? Now you can jump-start your day with the "world's strongest coffee." At least that's the claim of the not-so-subtly-named Black Insomnia, which contends it has scientific proof its brew packs multiple times the punch of a normal cup of Joe. The South African newcomer boasts it has achieved "dangerously high levels of caffeine" by harvesting only Robusta beans, rather than the tamer Arabica variety. As for taste, which seems beside the point, the brand promises "a nice walnut and almost sweet taste profile," with nary a trace of "a burnt and high acidic flavor." You can be the judge (kind of): The company announced its beans went on sale in the US via Amazon last Friday, but it's currently listed as unavailable. It's apparently a hot contest for the global title of strongest coffee, with companies such as Death Wish in the running. Food & Wine gives context with this math: Caffeine Informer lists 351mg of caffeine in a 6-ounce cup of Black Insomnia, compared with 330mg for Death Wish. That's skirting the maximum 400mg per day that the Mayo Clinic recommends for "healthy adults." A normal cup packs a relatively paltry 70mg. Founder Sean Kristafor claims to have essentially reached the upper limit, with a press release warning competitors against attempting to "surpass this content in the interest of public health and safety." Further, he notes that while developing his coffee, "any blend that resulted in a higher caffeine content than 702mg [per 12 ounces] adversely affected the flavor and thus was rejected." (These students were given potentially lethal doses of caffeine.)