PUR-C products are manufactured to the highest standards of quality, purity and potency, while offering the best value on the market. Our company is committed to providing our healthcare professionals with unmatched quality product. Therefore, as part of our pledge to excellence, our third-party independent laboratories perform a multi-stage analytical testing process on each product batch to guarantee superior purity and potency. We offer Ultra-Pure and Professional Grades Sodium Ascorbate Vitamin C products as was used in the original protocols published by the renowned Dr. Frederick Klenner, and Dr. Robert Cathcart. https://www.pur-c.com/