Alexandra Sifferlin, TIME

There’s no denying the energy drink industry is booming, with 60% growth between 2008 to 2012. But a new report from three U.S. senators raises questions about one particular segment of the market that’s growing: minors.

The report, titled “Buzz Kill,” is part of senators Edward J. Markey (D-Mass.), Dick Durbin (D-Ill.), and Richard Blumenthal (D-Conn.)’s ongoing investigation into the energy drink industry. Their primary concerns are lack of regulation by the U.S. Food and Drug Administration (FDA) over the drinks, which may pose health problems for kids, adolescents and teens.

“Unfortunately, as long as early development of brand loyalty is seen as a competitive market advantage, energy drink companies will continue with the practice of marketing to teens in the absence of regulation that prohibits it,” the report reads.

The American Beverage Association has long offered guidance to the beverage industry on labeling, advisory statements, and marketing to children, recommending voluntary statements that the drinks are not recommended for kids and that the products not be promoted at K-12 schools. While several energy drink companies, including Red Bull and Monster, have made a commitment not to market to kids 12 and under, some critics say people over age 12 are still at risk for possible health consequences, like neurodevelopment interactions and heart-related effects.

In response to the report, American Beverage Association spokesperson Christopher Gindlesperger said this, in a statement:

“Energy drinks have been enjoyed safely by millions of people around the world for more than 25 years, and in the U.S. for more than 15 years. Energy drinks, their ingredients and labeling are regulated by the FDA, and, like most consumer products, their advertising is subject to oversight from the U.S. Federal Trade Commission.

This report ignores crucial data about energy drinks and caffeine consumption in the U.S. Based on the most recent government data reported in the journal Pediatrics, children under 12 have virtually no caffeine consumption from energy drinks. This study’s findings are consistent with an analysis commissioned by FDA and updated in 2012, as well as a published ILSI survey of more than 37,000 people which shows that caffeine consumption in the U.S. has remained stable during the most recent period analyzed, while coffee remains the primary source of caffeine in most age groups.

Leading energy drink manufacturers voluntarily go far beyond all federal requirements when it comes to labeling and education. In fact, ABA member companies voluntarily display total caffeine content – from all sources – on their packages along with advisory statements indicating that the product is not recommended for children, pregnant or nursing women and persons sensitive to caffeine. They also have voluntarily pledged not to market these products to children or sell them in K-12 schools.

Based on current regulations, the companies are not breaking rules. An FDA regulatory category for “energy drinks” does not exist, and companies can file their energy drinks to the FDA as either foods or dietary supplements. Some companies do not need to label the amount of caffeine in their products, and others are not required to report adverse health events linked to their products. Given the regulatory confusion, the report authors say the FDA and manufacturers need to make some changes for better transparency.

The senators call on the FDA to set a recommendation for the amount of caffeine a child or adolescent can safely consume each day. They also argue that all energy drink companies should commit to providing adverse-event reports to the FDA, and companies should stop promoting their beverages as “sports drinks.”

You can read the full report, here.

As the energy drink market continues to grow, and research continues to develop, the debate over whether energy drinks should be allowed in the hands of teens will continue.