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The all-new EFS-PRO delivers higher levels of calories, electrolytes and other essential nutrients than other drinks without causing GI distress, even in the most extreme conditions.
It’s also designed to taste like flavored water so multiple bottles can be consumed easily without the dreaded ‘sweetness fatigue.’ This means EFS-PRO can be mixed at stronger concentrations than other drinks and still be absorbed quickly and easily.
OptygenHP gives me better performance. It’s part of my daily routine.
Without a doubt, First Endurance has made me faster.
I am now able to rebound fast enough to make every run a strong one.