Calcium oxalate crystals in the urine are the most common cause of kidney stones. Learn where they come from, how to prevent them, and how to remove them.

When oxalate attaches to calcium in your urine, it leads to stones. Limiting sodium -- ideally, to no more than 1,500 milligrams a day -- also has heart-health benefits.

Objective: To evaluate the effect of a mineral water rich in magnesium (337 mg/l), calcium (232 mg/l) and bicarbonate (3388 mg/l) on urine composition and the risk of calcium oxalate crystallization.

Pediatric Research - 374 Calcium/Creatinine Ratio in One Urine Sample Inadequately Reflects Normo- and Hypercalciuria in Preterm Born Infants. Skip to main content.