Water is the default hydration advice, but a small study of Division I basketball players suggests it may not protect shooting accuracy as well as water with a little L-alanyl-L-glutamine. Ten women played four 40-minute games, and the low dose of 1 g per 500 ml beat water by 11.1% on shooting. The higher dose did not do better on shooting, and jump power didn't change at all. Here are the numbers, the practical takeaways, and the caveats you should weigh before stirring any of it into your bottle.
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