There is some evidence that L-Theanine, a compound found in some energy drinks, has positive effects on mood, anxiety and cognitive function; the effects are more pronounced in conjunction with caffeine.When mixed with alcohol, either as a prepackaged caffeinated alcoholic drink, a mixed drink, or just a drink consumed alongside alcohol, energy drinks are often consumed in social settings.

Effects

Energy drinks have the effects caffeine and sugar provide, but there is little or no evidence that the wide variety of other ingredients have any effect. Most of the effects of energy drinks on cognitive performance, such as increased attention and reaction speed, are primarily due to the presence of caffeine. Advertising for energy drinks usually features increased muscle strength and endurance, but there is little evidence to support this in the scientific literature.A caffeine intake of 400 mg per day (for an adult) is considered safe from the European Food Safety Authority (EFSA). Adverse effects associated with caffeine consumption in amounts greater than 400 mg include nervousness, irritability, sleeplessness, increased urination, abnormal heart rhythms (arrhythmia), and dyspepsia. Consumption also has been known to cause pupil dilation. Caffeine dosage is not required to be on the product label for food in the United States, unlike drugs, but most (although not all) place the caffeine content of their drinks on the label anyway, and some advocates are urging the FDA to change this practice.

With alcohol

Combined use of caffeine and alcohol may increase the rate of alcohol-related injury. Energy drinks can mask the influence of alcohol, and a person may misinterpret their actual level of intoxication. Since caffeine and alcohol are both diuretics, combined use increases the risk of dehydration, and the mixture of a stimulant (caffeine) and depressant (alcohol) sends contradictory messages to the nervous system and can lead to increased heart rate and palpitations. Although people decide to drink energy drinks with alcohol with the intent of counteracting alcohol intoxication, many others do so to hide the taste of alcohol. However, in the 2015, the EFSA concluded, that “Consumption of other constituents of energy drinks at concentrations commonly present in such beverages would not affect the safety of single doses of caffeine up to 200 mg.” Also the consumption of alcohol, leading to a blood alcohol content of about 0.08%, would, according to the EFSA, not affect the safety of single doses of caffeine up to 200 mg. Up to these levels of intake, caffeine is unlikely to mask the subjective perception of alcohol intoxication.

Health problems

Excessive consumption of energy drinks can have serious health effects resulting from high caffeine and sugar intakes, particularly in children, teens, and young adults. Excessive energy drink consumption may disrupt teens' sleep patterns and may be associated with increased risk-taking behavior. Excessive or repeated consumption of energy drinks can lead to cardiac problems, such as arrhythmias and heart attacks, and psychiatric conditions such as anxiety and phobias. In Europe, energy drinks containing sugar and caffeine have been associated with the deaths of athletes. Reviews have noted that caffeine content was not the only factor, and that the cocktail of other ingredients in energy drinks made them more dangerous than drinks whose only stimulant was caffeine; the studies noted that more research and government regulation were needed.Research suggests that emergency department (ED) visits are on the increase. In 2005, there were 1,494 emergency department visits related to energy drink consumption in the United States; whereas, in 2011, energy drinks were linked to 20,783 emergency department visits. During this period of increase, male consumers consistently had a higher likelihood of visiting the emergency department over their female counterparts. Research trends also show that emergency department visits are caused mainly by adverse reactions to the drinks. In 2011, there were 14,042 energy drink-related hospital visits. Misuse and abuse of these caffeinated drinks also cause a significant amount of emergency department visits. By 2011, there were 6,090 visits to the ED due to misuse/abuse of the drinks. In 42% of cases, patients had mixed energy drinks with another stimulant, and in the other 58% of cases the energy drink was the only thing that had been consumed. Several studies suggest that energy drinks may be a gateway drug.The American Academy of Pediatrics recommends that children not consume caffeinated energy drinks.

History

Energy drinks were an active subset of the early soft drink industry; Pepsi, for instance, was originally marketed as an energy booster. Coca-Cola's name was derived from its two active ingredients, both known stimulants: coca leaves and kola nuts (a source of caffeine). Fresh coca leaves were replaced by "spent" ones in 1904 because of concerns over the use of cocaine in food products; the federal lawsuit United States v. Forty Barrels and Twenty Kegs of Coca-Cola and subsequent litigation pressured The Coca-Cola Company into reducing the amount of caffeine in its formula by 1916, though the Food and Drug Administration ultimately lost the case against the inanimate Coca-Cola barrels because it failed to demonstrate that the caffeine levels in the drink—78 mg per 8 fl oz, a level comparable to modern energy drinks, at the time of the lawsuit—was harmful as alleged. These developments brought an end to the first wave of energy drinks.In the UK, Lucozade Energy was originally introduced in 1927 by a Newcastle pharmacist, William Walker Hunter, as a hospital drink for "aiding the recovery;" in the early 1980s, it was promoted as an energy drink for "replenishing lost energy." One of the first post-Forty Barrels energy drinks introduced in America was Dr. Enuf. Its origins date back to 1949, when a Chicago businessman named William Mark Swartz was urged by co-workers to formulate a soft drink fortified with vitamins as an alternative to sugar sodas full of empty calories. He developed an "energy booster" drink containing B vitamins, caffeine and cane sugar. After placing a notice in a trade magazine seeking a bottler, he formed a partnership with Charles Gordon of Tri-City Beverage to produce and distribute the soda. Dr. Enuf is still being manufactured in Johnson City, Tennessee and sold sparsely throughout the nation.In Japan, the energy drink dates at least as far back as the early 1960s, with the launch of the Lipovitan brand. However, in Japan, most of the products of this kind bear little resemblance to soft drinks, and are sold instead in small brown glass medicine bottles, or cans styled to resemble such containers. These "eiyō dorinku" (literally, "nutritional drinks") are marketed primarily to salarymen. Bacchus-F, a South Korean drink closely modeled after Lipovitan, also appeared in the early 1960s and targets a similar demographic.In 1985, Jolt Cola was introduced in the United States. Its marketing strategy centered on the drink's caffeine content, billing it as a means to promote wakefulness. The drink's initial slogan read: "All the sugar and twice the caffeine."In 1995, PepsiCo launched Josta, the first energy drink introduced by a major US drink company (one that had interests outside energy drinks), but Pepsi discontinued the product in 1999. Pepsi would later return to the energy drink market with the AMP brand.

In Europe, energy drinks were pioneered by the Lisa company and a product named "Power Horse", before Dietrich Mateschitz, an Austrian entrepreneur, introduced the Red Bull product, a worldwide bestseller in the 21st century. Mateschitz developed Red Bull based on the Thai drink Krating Daeng, itself based on Lipovitan. Red Bull became the dominant brand in the US after its introduction in 1997, with a market share of approximately 47% in 2005.In New Zealand and Australia, the leading energy drink product in those markets, V, was introduced by Frucor Beverages. The product now represents over 60% of market in New Zealand and Australia.UK supermarkets have launched their own brands of energy drinks, sold at lower prices than the major soft drink manufacturers, that are mostly produced by Canadian beverage maker Cott. Tesco supermarkets sell "Kx" (formerly known as "Kick"), Sainsbury's sell "Blue Bolt" and Asda sell "Blue Charge"—all three drinks are sold in 250-millilitre cans and 1-litre bottles—while Morrison's sell "Source" in 250-millilitre cans. Cott sells a variety of other branded energy drinks to independent retailers in various containers.In 2002, Hansen Natural Company introduced the energy drink Monster Energy. Hansen Natural Company changed their name to Monster Beverage Corporation after an agreement by shareholders to change the name after Monster Energy became the largest source of revenue. The company's previous beverages were taken ownership by The Coca-Cola Company.Since 2002, there has been a growing trend for packaging energy drinks in bigger cans. In many countries, including the US and Canada, there is a limitation on the maximum caffeine per serving in energy drinks, so manufacturers include a greater amount of caffeine by including multiple servings per container. Popular brands such as Red Bull, Hype Energy Drinks and Monster have increased the can size.The energy shot product, an offshoot of the energy drink, was launched in the US with products such as "5-Hour Energy," which was first released onto the market in 2004. A consumer health analyst explained in a March 2014 media article: "Energy shots took off because of energy drinks. If you’re a white collar worker, you’re not necessarily willing to down a big Monster energy drink, but you may drink an energy shot."In 2006 energy drinks with nicotine became marketed as nicotine replacement therapy products.In 2007, energy drink powders and effervescent tablets were introduced, whereby either can be added to water to create an energy drink.Energy drinks are also popular as drink mixers—Red Bull and vodka is a popular combination.

On 14 August 2012, the word "energy drink" was listed for the first time in the Merriam-Webster's Collegiate Dictionary.

Variants

By concentration

Energy shots

Energy shots are a specialized kind of energy drink. Whereas most energy drinks are sold in cans or bottles, energy shots are usually sold in smaller 50ml bottles. Energy shots can contain the same total amount of caffeine, vitamins or other functional ingredients as their larger versions, and may be considered concentrated forms of energy drinks. The marketing of energy shots generally focuses on their convenience and availability as a low-calorie "instant" energy drink that can be taken in one swallow (or "shot"), as opposed to energy drinks that encourage users to drink an entire can, which may contain 250 calories or more. A common energy shot is 5-hour Energy which contains B vitamins and caffeine in an amount similar to a cup of coffee.

By ingredient

Nicotine drinks

Energy drinks with nicotine are marketed as nicotine replacement therapy products.

Combined psychoactive ingredients

Caffeinated alcoholic drink

Energy drinks such as Red Bull are often used as mixers with alcoholic drinks, producing mixed drinks such as Vodka Red Bull which are similar to but stronger than rum and coke with respect to the amount of caffeine that they contain. Sometimes this is configured as a bomb shot, such as the Jägerbomb or the F-Bomb — Fireball Cinnamon Whisky and Red Bull.Caffeinated alcoholic drinks are also sold in some countries in a wide variety of formulations. The American products Four Loko and Joose originally combined caffeine and alcohol before caffeinated alcoholic drinks were banned in the U.S. in 2010.

Chemistry

Energy drinks generally contain methylxanthines (including caffeine), B vitamins, carbonated water, and high-fructose corn syrup or sugar (for non-diet versions). Other common ingredients are guarana, yerba mate, açaí, and taurine, plus various forms of ginseng, maltodextrin, inositol, carnitine, creatine, glucuronolactone, sucralose or ginkgo biloba. The sugar in non-diet energy drinks is food energy, while there is no scientific evidence that addition of other ingredients has any effect on human health.

In the United States, the caffeine content of energy drinks is in the range of 40 to 250 mg per 8 fluid ounce (237 ml) serving. The FDA recommends that 400 mg per day is safe for adults, while 1200 mg per day can be toxic.

Demographics

Globally, energy drinks are typically attractive to youths and young adults. One study revealed that the amount of caffeine being consumed was 227 milligrams per day among young adults ages 20 through 39, compared to their non-consumer counterparts, who only consumed about 52.1 milligrams of caffeine per day.

Sales and trends

In 2017, global energy drink sales were about 44 billion euros. The United States market for energy drinks is forecast to reach $19 billion by 2021. Male consumers 18–35 years old and Hispanics were influential in growing the category through 2016. In 2017, manufacturers were modifying the composition of energy drinks for reduced or no sugar content and lower calories, caffeine content, "clean" labels to reflect the use of organic ingredients, exotic flavors, and ingredients that may affect mood.

Regulations

Some countries have certain restrictions on the sale and manufacture of energy drinks. A ban was challenged in the European Court of Justice in 2004 and consequently lifted.

Australia and New Zealand

In Australia and New Zealand, energy drinks are regulated under the Australia New Zealand Food Standards Code; limiting the caffeine content of 'formulated caffeinated beverages' (energy drinks) at 320 mg/L (9.46 mg/oz) and soft-drinks at 145 mg/L (4.29 mg/oz). Mandatory caffeine labeling is issued for all food products containing guarana in the country, and Australian energy drink labels warn consumers to drink no more than two cans per day.

Bridgetown in Western Australia became the first place in Australia to ban the sale of energy drinks to persons under 18 years for four months as of February 2023.

Colombia

In 2009 under the Ministry of Social Protection, Colombia prohibited the sale and commercialization of energy drinks to minors under the age of 14.

Latvia

In June 2016, Latvia banned the sale of energy drinks containing caffeine or stimulants like taurine and guarana to people under the age of 18.

Lithuania

In November 2014, Lithuania became the first country in the EU to ban the selling of energy drinks to anyone under the age of 18. The Baltic state placed the ban in reaction to research showing how popular energy drinks were among minors. According to the AFP reports roughly 10% of school-aged Lithuanians say they consume energy drinks at least once a week.

Norway

Norway did not allow Red Bull for a time, although this restriction has been relaxed. In May 2009, it became legal to sell in Norway. The Norwegian version has reduced levels of vitamin B6. The United Kingdom investigated the drink, but only issued a warning against its consumption by children and pregnant women.

Russia

In November 2012, President Ramzan Kadyrov of Chechnya (Russian Federation) ordered his government to develop a bill banning the sale of energy drinks, arguing that as a form of "intoxicating drug", such drinks were "unacceptable in a Muslim society". Kadyrov cited reports of one death and 530 hospital admissions in 2012 due to "poisoning" from the consumption of such drinks. A similar view was expressed by Gennady Onishchenko, Chief Sanitary Inspector of Russia.

United Kingdom

In 2009, a school in Hove, England requested that local shops refrain from selling energy drinks to students. Headteacher Falklanda Sanders added that "This was a preventative measure, as all research shows that consuming high-energy drinks can have a detrimental impact on the ability of young people to concentrate in class." The school negotiated for their local branch of the Tesco supermarket to display posters asking students not to purchase the products. Similar measures were taken by a school in Oxted, England, which banned students from consuming drinks and sent letters to parents.

While not yet age-restricted by legislation, all major UK supermarkets have agreed to voluntarily stop the sale of energy drinks to under-16s. The UK government plans to end the sale of energy drinks to under-16s in the future.In January 2018, many United Kingdom supermarkets banned the sale of energy drinks containing more than 150 mg of caffeine per liter to people under 16 years old; this was followed by the UK government banning all sales of energy drinks to minors in 2019.

United States

As of 2013 in the United States some energy drinks, including Monster Energy and Rockstar Energy, were reported to be rebranding their products as drinks rather than as dietary supplements. As drinks they would be relieved of F.D.A. reporting requirements with respect to deaths and injuries and can be purchased with food stamps, but must list ingredients on the can.Some places ban the sale of prepackaged caffeinated alcoholic drinks, which can be described as energy drinks containing alcohol. In response to these bans, the marketers can change the formula of their products.

Uzbekistan

In January 2019, President Shavkat Mirziyoyev of Uzbekistan signed a law that imposes a number of restrictions on energy drinks. To protect the younger generation, a rule had been introduced prohibiting the sale of energy drinks to persons under the age of 18. Advertising of energy drinks was prohibited on television and radio from 7:00 to 22:00. It was also completely banned in printed publications intended primarily for children and adolescents, in medical, sports and educational institutions.