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Those symptoms usually come from electrolyte loss. I agree sport drinks aren't the best for replenishment. There are many supplements which will accurately replace electrolytes list in the proper proportions.I'd recommend the one from the company saltstick


Adding an educational note: salts are compound molecules, such as sodium and potassium chloride, not pure sodium! They're chloride salts. For rehydration, REI sells rehydration salts, but I think those have some sugar too.

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