What the research found
Researchers presenting at the American Heart Association's annual meeting reported that cardiac arrest occurred more often among people who consumed energy drinks and supplements than among those who did not, according to NBC News. The finding adds to a long-running discussion about whether heavily caffeinated and stimulant-laden products carry risks for the heart.
The network covered the work in a video segment published on Nov. 2, 2026. In it, NBC News correspondent Berkeley Lovelace Jr. walked viewers through the types of stimulants that people may want to be wary of. The summary of the segment does not list those ingredients by name, and it does not describe how the study was conducted.
What is and isn't known
The material available so far is limited. It does not say how many people were studied, how long they were followed, or how participants' consumption was measured. It also does not say how large the difference in cardiac arrest was between those who used the products and those who did not.
Those details matter. A statistical association shows that two things occur together, but it does not by itself prove that one causes the other. People who use energy products may differ from other people in sleep habits, diet, existing health conditions or other medications, and researchers typically try to account for such factors. Findings presented at scientific meetings are also often preliminary and may be refined before or during formal publication.
Background on stimulants and the heart
Cardiac arrest occurs when the heart abruptly stops pumping blood effectively, cutting off circulation to the brain and other organs. It is different from a heart attack, which is caused by a blockage in blood flow to the heart muscle, although the two can be related. Cardiac arrest is a medical emergency that requires immediate treatment.
Energy drinks and many dietary supplements marketed for energy, focus or workout performance commonly contain caffeine, often combined with other stimulating ingredients. Stimulants can raise heart rate and blood pressure, and in some people they may contribute to irregular heart rhythms. Doctors have long advised caution for people with known heart conditions, and the potential effects can be greater when several stimulant products are used at once.
Energy products are widely sold in the United States, from convenience stores to online retailers, and are popular among students, shift workers and people who exercise. Supplements in particular are not reviewed by federal regulators for safety and effectiveness before they reach the market in the way that prescription drugs are, which is one reason health groups urge consumers to read labels closely.
What consumers can consider
Because the details of the new study have not been fully laid out in the available summary, it is not possible to say how much any individual's risk might change. Health professionals generally suggest that people look at the ingredient lists on drinks and supplements, be aware of how much stimulant they take in over the course of a day, and talk with a doctor if they have a heart condition, a family history of heart problems, or symptoms such as palpitations, chest discomfort or fainting.
Further reporting and the full research findings should clarify which products and ingredients were most closely tied to the higher rate of cardiac arrest, and whether the association holds up under additional scrutiny.
