I have allergies an phlegm is a part of that. I have
this problem with some sports drinks, but not with others. I would advice you to experiment with different brands. Maxim (probably only available in Scandinavia) is a complete no go for me, Gatorade and some other things also does not work well. High5, Maurten, Enervit and my wife’s homemade currant syrup does work.
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