One week of the multi-strain probiotic SLAB51 helped elite athletes last about 33 seconds longer on a treadmill test, but a single dose did nothing and VO2max didn't change. The randomized, double-blind crossover trial also found higher levels of the antioxidant enzyme SOD before exercise. So what is SLAB51, and why might gut bacteria influence endurance at all? This article breaks down the study design, the numbers, and what athletes can realistically take from them. It also covers the limits: a small sample of elite men and a very short intervention.
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