Increased Risk of Kidney Stones

Cranberries contain oxalates that can increase the risk of kidney stone formation, especially in susceptible individuals. People with a history of kidney stones should exercise caution when using cranberry products.

Increased risk of kidney stone formation due to the presence of oxalates in cranberries. High oxalate levels in urine can lead to the crystallization of calcium oxalate, the most common type of kidney stone. Symptoms may include severe pain in the side and back, pain radiating to the lower abdomen and groin, pain on urination, pink, red or brown urine, frequent urination, nausea, and vomiting. The severity of the symptoms can vary depending on the size and location of the kidney stone.