Does spinach cause kidney stones? Kidney stones are commonly formed by oxalate crystals and urate crystals. Spinach has a high oxalate content and has always been considered as a culprit in kidney stone formation. But studies have shown that spinach alone does not cause kidney stones and there is no need to exclude spinach which is otherwise a good source of vitamins and minerals. Just remember to drink plenty of water! Drink Plenty Of Water, Kidney Stones, Vitamins And Minerals, Lettuce, Spinach, Herbs, Content, Nutrition, Crystals