Our expert says:
There could be various reasons for this water retention: a) if the nrf products contain creatine, then this could be the reason because this substance does cause water retention b) if he has sweated a lot during exercise then his body would be inclined to retain water to replace liquid that has been lost c) his potassium and sodium balance may be disturbed. If the problem persists and is severe it may also be a good idea to have a medical checkup to see if he has kidney problems or a deficiency of some of these minerals.
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