Sodium management in the body is a complex system that operates within reasonably fine tolerances. Getting it wrong can have some severe consequences so the question is how to get it right?

Until now this has been the domain of those prepared to go through years of trial and error or those lucky enough to be backed by professional sports science labs for complex patch based sweat testing and one off drink production by sports nutritionists.

Human sweat can be tested for its electrolyte concentration and Precision Hydration Ltd was established to bring a patented technology to market making sweat testing and personalised hydration possible for anyone who is serious about being at their best.

Table is from Precision Hydration's website:

Table showing the typical electrolyte composition of human sweat and estimations of how much sweat loss needs to be incurred to become deficient in each electrolyte.