Saliva vs. Gastric Juice: What's the Difference?

No, saliva does not contain gastric juice. Saliva is produced in the mouth by the salivary glands, while gastric juice is produced in the stomach by the gastric glands. Saliva is mostly composed of water, mucus, and enzymes that help to break down food and moisten the mouth, while gastric juice is composed of hydrochloric acid, pepsin, and other enzymes that help to digest food in the stomach.