Gluten-free ingredients are foods that do not contain gluten, a protein found in wheat, barley, and rye. Common gluten-free options include rice, corn, quinoa, and potatoes. Many fruits, vegetables, and meats are naturally gluten-free, making them safe choices for those with gluten sensitivities or celiac disease. In addition to whole foods, there are many gluten-free alternatives available, such as gluten-free flours made from almonds, coconut, or chickpeas. Processed foods can also be gluten-free, but it's essential to check labels for hidden gluten sources. Always look for products labeled as certified gluten-free for assurance.