Yes they are grown the by the same companies that grow MSG. For more info research Dr. Baylock and see how they are grown the same way and how foods are being relabeled to say like Natural Flavor "MSG" a food preservative and flavor agent.
Nutritional Yeast while it might have the bs and used by some as an inexpensive filler compared to using more super green foods like Chlorella. For a link about msg go to http://www.daystarbotanicals.com