Oxalate is a naturally occurring compound found in many plants, including leafy greens, nuts, and fruits. It can bind with minerals like calcium, forming insoluble salts that may contribute to the formation of kidney stones in some individuals. While oxalate is present in various foods, the body can also produce it as a byproduct of metabolism. In moderation, oxalate is generally safe for most people. However, those with a history of kidney stones or certain health conditions may need to limit their intake of high-oxalate foods, such as spinach and rhubarb. Consulting a healthcare professional can help determine the best dietary choices for individual needs.