Mason Natural has been around since 1967 and is concerned with providing safe quality products that are affordable and can be used for the entire family. They carry over 400 vitamins and supplements and continue to expand their lines. Their products are manufactured to the highest standard using Good Manufacturing Processes (GMP) and FDA guidelines with state of the art machinery. They keep up with current research to further improve their products. They are certified by both the ASI food Safety Consultants and NSF.