When young women who don't usually exercise start lifting weights, their bodies lose some water inside their cells and overall, which might mean their muscles are holding less water, but it doesn't...

When guys who lift weights gain muscle, their muscle cells also hold more water — and this happens whether or not they take creatine. It suggests that growing muscle might be linked to how much water the cells hold.

If you're a guy who lifts weights, taking creatine won't make you hold more water outside your cells compared to just training — the water increase seems to come from working out, not the supplement.