Any one herd of him?
Karnazes is an endurance runner extraordinaire and has been saluted by Outside magazine as "America's Greatest Runner". He has also been hailed as one of the "Top 100 Most Influential People in the World" by TIME magazine and Men's Fitness says Karnazes "might just be the fittest man on the planet". Karnazes is also author of the best-selling autobiography Ultramarathon Man: Confessions of an All-Night Runner.
What supplements does he use to get in this kind of shape?