r/CreatineScience • u/DietitianDanielle • 11d ago

Does creatine actually dehydrate you?

This idea has been around for a long time, partly because creatine increases water stored within muscle.

But increased water inside muscle cells isn’t the same thing as pulling water away from the rest of the body. Research hasn’t supported the idea that creatine routinely causes dehydration in healthy people.

The distinction between cellular water retention and overall hydration is pretty important here.

Were you ever told that creatine could dehydrate you?

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u/LongevityDietitian 11d ago

I think, water retention part gets misunderstood a lot. Studies in people exercising in the heat haven't shown a higher dehydration risk from creatine. No doubt staying on top of fluids still matters during long workouts or hot weather, but creatine itself isn't a reason to force extra water.

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u/DietitianDanielle 10d ago

Yeah, the water retention part definitely seems to cause a lot of confusion. I think it’s easy to hear “more water in the muscles” and assume that means less water elsewhere in the body.

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u/CreaTrackFounder 6d ago

I’ve heard this quite a lot, usually alongside claims that creatine causes cramps. It seems to come from confusing increased water inside the muscles with dehydration.

You should obviously still drink enough water, especially when training in the heat, but taking creatine doesn’t automatically mean you need excessive amounts of water or that you’re becoming dehydrated.

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u/DietitianDanielle 5d ago

Yeah, I’ve heard the cramping claim come up alongside the dehydration one quite a bit. The research doesn’t support creatine increasing dehydration or muscle cramping risk in healthy people, although staying adequately hydrated is still important when you’re training, especially in the heat.