You can have the same effect from a glass of water with a small pinch of salt (well stirred), combined with half a handful of pumpkin seeds according to my expert ski instructor source (yes I called Austria).
This is ancient ski instructor knowledge, apparently.
I did some research on it too, on the intrawebz... pumpkin seeds have a high amount of magnesium, which is a muscle relaxant... So I guess it makes sense :)
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