By John D. Stoll, Mike Esterl and Frances Robinson 

Lithuania's parliament on Thursday voted overwhelmingly to ban the sale of high-caffeine energy drinks to minors--a move that could renew scrutiny of products like Red Bull and Monster elsewhere.

The small Baltic nation said it is the first country to take concrete action to ban sales to minors. "We hope that some countries of the EU that don't have a clear position will follow the Lithuanian way," Almantas Kranauskas, a health ministry official, said in an interview.

The move could embolden advocates of energy-drink legislation, who say young people tend to gravitate toward the drinks. A study commissioned in 2013 by the European Food Safety Authority found that adolescents were by far more prone to consume energy drinks than adults, with 68% of European youths aged 10 to 18 years old drinking them.

The European Commission has expressed concern about the health risks of such drinks, and they have drawn scrutiny from regulators in both the 28-member European Union and the U.S. The U.K. will soon require companies to label drinks with more than 150 milligrams per liter of caffeine, and German consumer protection agencies have called for tighter controls on energy drinks.

It isn't clear how much of a precedent the move by Lithuania, which has a population of only 3 million, will set. Attempts to prohibit sales to minors have generally fallen flat in larger markets. Lawmakers in Maryland, for instance, introduced a bill in February proposing a ban on youth sales, but a committee voted it down in March. Similar efforts in Chicago have failed to take hold. Lawmakers in New York state's Suffolk County last year prohibited the sale of energy drinks to minors--but only in county parks.

The stakes are high for makers of energy drinks, which is one of the fastest-growing beverage categories. Global energy-drink sales have grown more than fourfold over the past decade and rose 6.8% to $27.53 billion in 2013, according to market research firm Euromonitor. Austria's Red Bull GmbH has a 31.5% global market share, followed by California-based Monster Beverage Corp., with 14%, according to the data service.

Lithuania's legislation targets drinks that contain 150 milligrams of caffeine per liter, and drinks containing certain other stimulants. Not only is the direct sale of these drinks to minors prohibited under the new law, but buying the drinks for them is also illegal. The ban is likely to dent a small but rapidly growing industry: sales of the top-selling energy drinks and sports drinks in the nation rose 37% between 2011 and 2013 to $20.6 million, according to Euromonitor.

A spokesman for the EU's health commissioner said the commission doesn't comment on laws being adopted by member states.

Energy drink makers have argued they are unfairly targeted. They say they don't market to children and that their products typically contain about 10 milligrams of caffeine per ounce, or half that of a Starbucks coffee. They also cite studies showing children get most of their caffeine from soda, coffee and tea, not energy drinks.

Officials with Red Bull couldn't be reached for comment. Carlsberg A/S, which sells Battery Energy Drink in Lithuania, and Monster said they couldn't provide immediate comment.

Coca-Cola Co., which sells a brand called Burn in Lithuania, referred comment to the Union of European Beverage Associations. The industry group declined to comment directly on Lithuania's move, saying only that energy drinks have the same amount of caffeine as coffee and that European energy-drink makers recommend on packaging that children don't drink their products.

Facing regulatory challenges in the past, companies such as Monster have reformulated drinks in order to meet regulatory thresholds. It is a costly method that manufacturers could employ if bans were to become more widespread, said Howard Telford, a beverage analyst with Euromonitor.

Energy drink companies have faced heightened scrutiny in the U.S. since 2012, when New York state Attorney General Eric Schneiderman launched a probe into their marketing and health claims and the Food and Drug Administration disclosed it was investigating whether energy drinks "may pose significant risks" if consumed in excess or by "vulnerable groups" including young people or those with pre-existing cardiac conditions. The companies at the time reiterated that their products are safe.

Companies including Red Bull and Monster, which dominate the roughly $10 billion in annual U.S. energy drink sales, faced a questioning last summer by the Senate Commerce Committee over allegations they were targeting youth.

The American Academy of Pediatrics says energy drinks "have no place in the diet of children and adolescents" and the American Medical Association supports a ban on marketing such drinks to children under 18 years of age.

Energy drink makers including Red Bull and Monster have voluntary warnings on their cans in the U.S. that their products aren't recommended for children, pregnant women or people sensitive to caffeine. Coca-Cola cautions on cans that its NOS and Full Throttle energy drinks aren't recommended for people under 18 years old.

Mr. Telford, of Euromonitor, said that while the energy-drink industry operates under the threat of increased regulation, most of the research on the subject is new. "I think that regulatory agencies are going to look at this more seriously," he said.

Monica Houston-Waesch and Clemens Bomsdorf contributed to this article.

Write to John D. Stoll at john.stoll@wsj.com, Mike Esterl at mike.esterl@wsj.com and Frances Robinson at frances.robinson@wsj.com

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