Product Tests Select a Review CL Answers  Warnings  Encyclopedia Where to Buy News

Recalls and Warnings

Consuming a Single Energy Drink May Increase Cardiovascular Risk

If you have experienced an unexpected and adverse reaction to a dietary supplement, nutritional product, or generic drug, we would like to hear about it, as we may investigate the problem.
(Date Posted: 11/11/2015)

A recently published study found that consumption of a single caffeinated energy drink significantly increased blood pressure and noradrenaline levels in healthy young adults. The researchers noted these changes could potentially increase the risk of cardiovascular events. The study was published on November 8, 2015 in the Journal of the American Medical Association (JAMA).

In the study, 25 healthy adults consumed a 16 oz. energy drink (Rockstar, Rockstar Inc.) containing 240 mg of caffeine, 2000 mg of taurine, and extracts of guarana seed, ginseng root, and milk thistle. On a separate day, the same adults consumed a placebo beverage that was similar in color and taste but did not contain caffeine or other stimulants. Measurements taken 30 minutes after the drinks were consumed found that, following ingestion of the energy drink, blood pressure increased an average of 6.4% (about 5 mm Hg), compared to a 1% increase (about 1 mm Hg) following ingestion of the placebo drink. Blood levels of norepinephrine (noradrenaline) increased by 73.6% following ingestion of the energy drink, compared to 30.9% after placebo. Compared to placebo, there was no significant difference in heart rate increase. 

The researchers warned that the increases in blood pressure and noradrenaline following ingestion of the energy drink could pose an increased cardiovascular risk, but stated the larger studies are needed.

See's Review of B Vitamin Supplements and Energy Drinks for more information about the safety of energy drinks and tests of related products.

To access the complete study, use the red link below.

For other Recalls and Warnings click HERE.
For information about reporting serious reactions and problems with medical products to the U.S. Food and Drug Administration through its MedWatch reporting program, please go to .


Follow us on... Encyclopedia

In addition to our product reviews our encyclopedia covers the following:

Visit our Partners

Join |  Sign In
Product Tests
Brands Tested
Health Conditions
CL Answers
Clinical Updates
Recalls & Warnings
Where to Buy Products
Raw Materials Tests
Testing Program
Join CL Today
Join Free Newsletter
Group Subscriptions
Gift Membership
About Us
The CL Seal
CL Survey
Privacy Policy
Contact Us/Help

©2018, LLC. All rights reserved. A single copy of a report may be printed for personal use by the subscriber. It is otherwise unlawful to print, download, store or distribute content from this site without permission. name and flask logo are both registered trademarks of, LLC. This site is intended for informational purposes only and not to provide medical advice.