LLM Guard by Protect AI is an open-source solution designed to enhance the security of Large Language Models (LLMs) by providing extensive security scanners that detect, redact, and sanitize against adversarial prompt attacks, data leakage, and integrity breaches. It is particularly relevant for enterprises using Retrieval-Augmented Generation (RAG) applications, as it secures data sources accessed for context in LLM applications, exemplified by a practical demonstration of an HR screening application. In this scenario, LLM Guard effectively identifies and mitigates embedded prompt injections concealed within candidate CVs, demonstrating its capability to protect against sophisticated threats to data integrity. With over 2.5 million downloads and a Google Patch Reward, LLM Guard is recognized as a market leader in LLM security, addressing corporate hesitance in adopting LLM technologies due to potential security risks. The tool underscores the importance of securing RAG applications by ensuring comprehensive input and output scanning during data retrieval and processing, thus maintaining the integrity of critical enterprise applications.