The molar ratio between sodium and potassium

Homemade electrolyte reconstitution requires respecting physiological osmolarity, which sits between 280 and 295 milliosmoles per kilogram. An excess of salts creates a hypertonic mixture that draws fluid into the intestine, while insufficient dilution fails to stimulate the SGLT-1 cotransporters needed to move water into the bloodstream.

Fluid and electrolyte balance factors

Designing a balanced mixture eliminates artificial sweeteners and relies on the following elemental solute ratios:

• Marine sodium intake: Between 450 and 700 milligrams per liter of water to offset primary sweat excretion.
• Potassium citrate fraction: Between 150 and 200 milligrams of elemental potassium to support daily membrane potential without irritating the stomach.
• Hydration volume: Dissolution in low-mineral water to avoid raising baseline osmotic pressure.

Adjustment based on individual sweat rate

Athletes with high salt loss (marked by white salt stains on sportswear) should adjust sodium chloride toward the upper limit while keeping potassium constant. This modular approach allows you to tailor concentration to ambient temperature and workout duration without relying on pre-made industrial formulas with added sugars.