Here's what other sites are saying:
First Endurance's Optygen HP will help you train harder and recover faster by improving oxygen utilization, which increases your body's ability to adapt to physical stress and a higher aerobic threshold. The improved formula of Optygen HP features Rhodiola (tested to improve mental and physical performance) that's twice as strong as the original formula. In addition to Rhodiola, Optygen HP includes Beta-Alanine, with a 1,500mg of Beta-Alanine per serving. Beta-Alanine has been tested to increase muscular endurance, boost strength, exercise capacity, and to delay muscular fatigue.
Where to Buy
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Skratch Labs Exercise Hydration Mix
Hammer Nutrition Recoverite Drink Mix
$4 - $34
Hammer Nutrition Perpetuem
$3 - $30
Vitalyte Electrolyte Replacement Drink Mix
Hammer Nutrition Endurolytes Fizz Tube
GU Roctane Ultra Endurance Energy Drink
$3 - $32