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Coconut water is very high in potassium (~600 mg per cup — more than a banana). For healthy kidneys it's fine; for anyone with CKD stage G3b-G5, potassium-sparing diuretics, or on dialysis, it's a real hyperkalemia risk.
One cup of coconut water contains roughly 600 mg of potassium — among the highest of common drinks, exceeding bananas (~420 mg) and orange juice (~440 mg).
CKD impairs potassium excretion. A single glass in advanced CKD can push potassium toward the danger zone (5.5-6.0+ mEq/L), where heart-rhythm risk rises. ER doctors routinely see hyperkalemia from coconut water in undiagnosed CKD.
It's also a common 'health halo' trap: patients switching to coconut water to 'detox' unknowingly add the single worst potassium load available.
For healthy people it's an excellent drink. For CKD — treat like a potassium medicine: only with your nephrologist's knowledge.
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This content is a general reference, not medical advice, a diagnosis, or a treatment plan. Do not change your diet, fluids, medicines, or dialysis plan without your nephrologist or renal dietitian. Individual recommendations depend on your labs, medications, conditions, and care plan.