In order to receive approval for natural flavorings in certified organic products, certain criteria must be met as per NOP section 205.605(a)(9).
The link below states that the flavor must be from non-synthetic sources only and must not be produced using synthetic solvents, carrier systems or any artificial preservative. It must not be sourced from anything containing GMOs or using ionizing radiation. The link below explains in further detail what is allowed and not allowed under organic regulations.
MSG is not a part of any natural flavoring that Purium has in its product line.
MSG was discovered and patented in the early 1900s to replicate and enhance the umami flavor profile(savory or meaty flavor) and is not consistent with any Purium flavoring currently in use (apple, berry, caramel, chocolate, vanilla, fruit, etc...).
FDA’s position on MSG and the labeling of MSG is explained in further detail in the following link. The FDA explicitly states that MSG cannot be listed as spices and flavorings.