Methylene Blue is in compliance and is considered safe for consumption. We adhere to stringent guidelines and regulations established by the U.S. Food and Drug Administration (FDA) and other relevant authorities. If you would like more detailed information, we welcome you to reach out to our customer support team directly, and we can provide you with testing to show that this product does not contain toxic metals. Before anything goes to production, all ingredients are tested to ensure purity and potency. The final products are also tested with industry-leading equipment by third-party organizations.