Are the Brands of Prepared Cooking Seasonings Used in Gluten-Free Items actually Gluten-Free?

Are brands of prepared Cooking seasonings used on "Gluten-Free" items, actually "Gluten-Free" and MSG free? (i.e., Soy Sauce, Teriyaki Sauce, BBQ Sauce, Marination, Wine, Sherry, Alcohol, Juices, Stocks, Consumes, Sprinkled Taste Boosters and Seasoning Salts). (Why, It could be that the Chef likes to use a dash of his homemade meat tenderizer combination on ALL grilled and roasted entrees and this tiny dash has just enough Gluten to make it unsafe.)