CHICAGO — A major study presented at the American Heart Association (AHA) Scientific Sessions in Chicago has uncovered a sharp link between popular energy drinks, stimulant workout powders, and life-threatening cardiovascular emergencies in young adults. Researchers analyzing federal post-market safety databases discovered that consumers using highly caffeinated products faced an 11-fold surge in reported cases of sudden cardiac arrest compared to other nutritional supplements.
The preliminary research, led by investigators from the University of Virginia School of Medicine, evaluated over 28,000 adverse-event reports submitted to the U.S. Food and Drug Administration (FDA) between 2017 and 2025. The data revealed that approximately 45 percent of all cardiovascular emergency filings involving caffeinated stimulants occurred in adults aged 18 to 34—an age group normally considered at low baseline risk for serious heart disease.
According to the findings, adverse reports involving caffeine, guarana, synephrine, and secondary stimulants showed a 4.5 times higher rate of myocardial infarction (heart attack) than non-stimulant products. In addition, ventricular arrhythmias and acute palpitations appeared roughly four times more frequently, accompanied by sharp increases in chest pain, rapid heart rates, and fainting.
"Our findings support the case for more systematic safety monitoring of caffeine- and stimulant-containing products," said lead study author Sai Samayamanthula. "Healthcare professionals should remember to ask their younger patients who have palpitations, chest pain, or fainting spells if they recently or regularly consume these products."
Public health guidelines generally advise healthy adults to cap caffeine intake at 400 milligrams daily, roughly equivalent to four cups of brewed coffee. However, many modern pre-workouts and commercial energy drinks deliver up to 300 milligrams per serving alongside synergistic stimulants, which can rapidly elevate blood pressure and provoke dangerous electrical heart disturbances, especially during strenuous physical training.
Reference:
Samayamanthula, S. (2026). Association of Energy Drinks and Stimulant Supplements with Adverse Cardiovascular Events in Young Adults: An Analysis of FDA Reports. American Heart Association Scientific Sessions 2026.