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Turmeric as a spice is safe and adds flavor — but there is no clinical evidence it treats or prevents kidney disease. High-dose curcumin supplements carry a real risk: some products have caused acute kidney injury, and curcumin can raise oxalate (stone risk) and interact with blood thinners.
Curcumin has anti-inflammatory properties in lab studies, but no clinical trial shows it slows CKD or protects kidney function. Claims to that effect are marketing, not medicine.
Reported harms: acute kidney injury linked to curcumin supplements (case reports), high oxalate content (stone risk in calcium-oxalate formers), and anticoagulant interaction (bleeding risk with warfarin/NOACs).
Practical rule: culinary turmeric (a pinch in cooking) is harmless; avoid concentrated supplements, especially in CKD, stone formers, and patients on blood thinners.
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