Popular Workout Supplement May Reduce Heart Benefits

What Did the Dalhousie Research Find About Supplements and Heart Health?

Researchers at Dalhousie University, publishing in Scientific Reports, investigated how a commonly used pre-workout supplement marketed to enhance athletic performance affected cardiovascular changes that normally occur with consistent training. The study followed women who exercised regularly and compared cardiac measures between those using the supplement and those who did not. The findings suggested that some of the typical positive adaptations the heart makes in response to exercise — adaptations that contribute to long-term cardiovascular health — appeared blunted in supplement users.

This matters because much of the existing research on workout supplements has been conducted in male athletes, with results often extrapolated to women. Sex-based differences in cardiovascular physiology, hormonal regulation, and muscle metabolism can meaningfully influence how the body responds to both exercise and supplementation. The Dalhousie team emphasized that more sex-specific research is needed before recommending widely used supplements to women, particularly when the goal extends beyond short-term performance to long-term heart health.

Why Are Sex-Specific Studies Important in Sports Medicine and Cardiology?

For decades, sports science and cardiology research relied heavily on male participants, and findings were often generalized to women without dedicated study. The U.S. National Institutes of Health and similar bodies have repeatedly called for greater inclusion of women in clinical research, citing meaningful biological differences in hormone cycles, body composition, and cardiovascular response. When supplements or training protocols are evaluated only in men, recommendations made to women rest on assumptions rather than evidence.

The new research adds to a growing body of work showing that physiological responses to exercise and to common supplements can differ between sexes. For clinicians and patients, the practical implication is straightforward: women who use performance supplements alongside an exercise program should be aware that the long-term cardiovascular effects may not mirror what has been documented in male-dominated studies. Discussing supplement use with a healthcare provider — particularly when there is existing heart disease risk — is a reasonable precaution.

What Should Women Consider Before Using Performance Supplements?

The cardiovascular benefits of regular physical activity are among the most consistent findings in medicine. According to the World Health Organization and major cardiology bodies, adults who meet recommended activity levels — generally 150 minutes of moderate or 75 minutes of vigorous exercise per week — see substantially lower risks of cardiovascular disease, stroke, and premature death. These benefits do not require supplementation.

For women considering performance supplements, the recent findings argue for caution rather than alarm. Supplement labels typically do not undergo the same regulatory scrutiny as prescription drugs, and many products contain ingredients with limited long-term safety data in women. A reasonable approach is to discuss any supplement with a primary care doctor or cardiologist, especially for those with hypertension, family history of heart disease, or other cardiovascular risk factors.