Four natural supplements pack the potential to take one’s endurance to new heights.

In sports, victory and personal bests come down to the smallest margins. While training and mental strength build a solid foundation, optimized nutrition can give you that extra 1 percent edge.

Whether a teenager chasing a faster 5K or a senior looking to boost walking stamina, four natural supplements pack the potential to take their endurance to new heights, according to research.

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Iron Will

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