The Claim
In healthy young adults aged 25 ± 6 years, consumption of 250 mL Red Bull (80 mg caffeine) or 57 mL 5-hour Energy (230 mg caffeine) significantly increases reactive hyperemia index (RHI) by 63 ± 37% and 82 ± 129%, respectively, at 4 hours post-consumption, while consumption of 355 mL NOS (120 mg caffeine) and 473 mL coffee (240 mg caffeine) does not significantly change RHI, indicating that differences in vascular response are not solely explained by caffeine content.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
In healthy young adults, drinking Red Bull or 5-hour Energy increases a measure of blood vessel function by about 60-80% four hours later, while drinking NOS or coffee with similar or higher caffeine levels does not change this measure.
See the scientific wording
In healthy young adults aged 25 ± 6 years, consumption of 250 mL Red Bull (80 mg caffeine) or 57 mL 5-hour Energy (230 mg caffeine) significantly increases reactive hyperemia index (RHI) by 63 ± 37% and 82 ± 129%, respectively, at 4 hours post-consumption, indicating transient improvement in endothelial function, while 355 mL NOS (120 mg caffeine) and 473 mL coffee (240 mg caffeine) show no significant change, suggesting that caffeine content alone does not explain the differential effects on vascular function.
Certain energy drinks contain compounds that reduce oxidative stress and stimulate nitric oxide production in blood vessel walls, making the vessels relax and allowing more blood flow. Other drinks with similar caffeine levels lack these compounds, so they don't produce the same effect.
What the research says
1 studyStudy: Evaluation of the Effects of Different Energy Drinks and Coffee on Endothelial Function.
Some energy drinks like Red Bull and 5-hour Energy made blood vessels work better for a short time after drinking them, but coffee and another energy drink called NOS didn’t—even though they had more caffeine. So it’s not just the caffeine doing the trick.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.