In the movie "Who Am I" starring Jackie Chan we see a character giving someone an coconut infusion after they've suffered blood loss.
Does this really work?
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Yes and no. The way it's depicted in the film, it would have zero effect. You can't simply feed a piece of surgical tubing into someone's vein and rely on capillary action and gravity to infuse their bloodstream with coconut water. Without a tight seal at both ends, the most likely result would be that the person bled out into the coconut or simply bled out where the tube had been inserted
A 1979 study did conclude that in a pinch, you could use coconut water as saline replacement fluid without the user suffering immediate ill effects but it was stressed that this was an emergency procedure and one that was extremely badly advised when any other form of sterile saline or water was available.