Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Glycerol (also known as glycerin) has been scientifically investigated as an ergogenic aid, primarily due to its properties as an osmolyte and its ability to promote hyperhydration. Research has shown that ingestion of glycerol with water can increase total body water, plasma volume, and delay dehydration, which is particularly relevant for athletes exercising in hot environments. Several studies have demonstrated that pre-exercise glycerol-induced hyperhydration can improve thermoregulation and endurance performance by reducing the rate of increase in core body temperature and prolonging time to exhaustion during prolonged exercise. This is attributed to better fluid retention and increased sweating capacity, which help in maintaining performance and delaying fatigue.

However, the overall evidence is mixed. While some studies have reported positive effects, others have found minimal or no significant benefits on exercise performance. The International Olympic Committee (IOC) and other sports authorities have noted the potential for misuse and have, at times, restricted glycerol use due to concerns about unfair advantage. Currently, glycerol is not classified as a prohibited substance by the World Anti-Doping Agency (WADA), but athletes should check current regulations.

In summary, there is a moderate body of scientific evidence supporting glycerol's use for fluid retention and exercise performance in specific contexts (especially endurance sports in the heat), but its efficacy is not universal or robust across all exercise settings.

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