Calcium oxalate stones, the most common type of kidney stone, form when calcium and oxalate (or oxalic acid, which is naturally present in many plant-based foods and is also produced by the body as a waste product) bind together, forming crystals that can accumulate into a hard "stone."
Having excessive calcium in the urine (hypercalciuria) is the most common cause of calcium oxalate kidney stones. People prone to calcium oxalate kidney stones are advised to avoid high-dose calcium supplements and to stay well-hydrated (as inadequate fluid intake can increase the risk of kidney stones). Those with high urinary oxalate levels may also be advised to maintain a low-oxalate diet, which typically limits intake to about 50 to 100 mg of oxalate per day.
Sign in as a member to find out which supplements and foods may decrease the risk of calcium oxalate kidney stones and which may increase risk. Also learn which ingredients in supplements promoted to prevent or dissolve kidney stones have no evidence that they help. The full answer includes information about calcium and vitamin D supplements, potassium, hydroxycitric acid (HCA), vitamin C, curcumin and turmeric, collagen and chanca piedra, beverages such as cranberry juice, lemon juice, orange juice, Crystal Light, green tea, and plant-based milks such as almond milk, and foods such as cocoa and dark chocolate, chia seeds, apple cider vinegar, and more.