Popular Pre-Workout Supplements Linked to Increased Risk of Sleep Loss: Study

A new study, published in Sleep Epidemiology, suggests that popular pre-workout dietary supplements may significantly disrupt sleep among teenagers and young adults. The research, based on data from the Canadian Study of Adolescent Behaviors, found that young people who used these supplements were more than twice as likely to report extremely short sleep durations compared with non-users.

Pre-workout supplements are widely marketed to boost energy and improve exercise performance. Popular brands are commonly used by teenagers and young adults seeking enhanced workout results. However, these products often contain high levels of caffeine and stimulant-like ingredients, which may interfere with normal sleep patterns.

The study analyzed data from participants aged 16 to 30 years. Researchers found that individuals who had used pre-workout supplements within the previous year were significantly more likely to report sleeping five hours or less per night. This level of sleep is considered insufficient for healthy development and daily functioning. Health experts typically recommend 8–10 hours of sleep for adolescents and 7–9 hours for young adults.

Lead researcher Kyle T. Ganson from the University of Toronto noted that many pre-workout supplements contain between 90 and over 350 milligrams of caffeine per serving. For comparison, a can of cola contains about 35 milligrams, while a typical cup of coffee contains around 100 milligrams. Such high stimulant doses can remain active in the body for hours, making it harder to fall asleep.

Researchers say inadequate sleep during adolescence and young adulthood can affect mental health, academic performance, and physical development. They recommend that healthcare professionals discuss supplement use with young people and advise avoiding stimulant supplements 12–14 hours before bedtime.

The findings also highlight the need for greater awareness and stronger regulation of dietary supplements, as many young consumers may underestimate their potential health effects.

REFERENCE: Kyle T. Ganson, Alexander Testa, Jason M. Nagata. Use of pre-workout dietary supplements is associated with lower sleep duration among adolescents and young adults. Sleep Epidemiology, 2025; 5: 100124 DOI: 10.1016/j.sleepe.2025.100124