Glycerol-Electrolyte Solution Found to Enhance Fluid Balance in New Study

A recent study published in July 2026 investigated the effects of a novel glycerol-electrolyte solution (GES) on fluid balance compared to a placebo. The randomized trial involved 25 healthy, active adults aged around 30 years, with an average weight of approximately 77 kg. The participants underwent two trials in a randomized, counterbalanced order.

Participants arrived at the laboratory in a euhydrated state, emptied their bladders, and had their baseline body mass measured. They then consumed 1 liter of either the GES, containing 0.75% glycerol, 40 mmol/L sodium, 15 mmol/L potassium, 8 mmol/L magnesium, and 5 mg calcium, or a placebo, which was water with flavors and sweetness matched to the GES. Urine collection and body mass measurements were conducted over an 8-hour period.

The results showed that fluid balance was significantly higher, and urine output was lower in the GES trial compared to the placebo across the entire 8-hour observation period. Specifically, fluid balance was 0.15% higher, and urine output was reduced by 112 grams. The most pronounced effects were observed at 2, 3, and 4 hours post-ingestion, with fluid balance increasing by up to 0.23% and urine output decreasing by up to 159 grams.

The study was funded by PepsiCo R&D, which had a role in the study's design, execution, and interpretation of results. However, the statistician responsible for analyzing the data was not involved in the experimental procedures. The authors, employed by PepsiCo R&D, stated that the views expressed in the manuscript do not necessarily reflect the company's position or policy.

This trial provides valuable insights into the potential benefits of GES in enhancing fluid balance, especially during the first few hours following ingestion. The findings suggest that GES could be a beneficial hydration strategy, although the study acknowledges its limitations and the need for further research.