It's a common misconception that Tamari, made with fermented soybeans and wheat, contains monosodium glutamate (MSG). However, that's not true. MSG is a chemical additive used to enhance flavor in foods. Additionally, it's an ingredient in some soy sauces since Tamari does contain naturally occurring glutamates from fermentation. Unless you have allergies or sensitivity issues to foods containing high levels of glutamate, you can enjoy Tamari. Read more about how different types of gluten-free soy sauce compare here.