Runners who took spirulina for four weeks lasted about 32% longer in an all-out effort after a brutal two-hour run. The same study found a 10.9% jump in fat oxidation and higher levels of the antioxidant glutathione. But before you stock up, there's a catch: only nine men took part, and the real-world gain was roughly 39 seconds. Here's what the research shows, why it might work, and how to try it safely.
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