What is one example of a common allergen?

Monosodium glutamate (MSG) is considered a common allergen because it can trigger adverse reactions in some individuals, often referred to as "Chinese restaurant syndrome." Symptoms can include headaches, flushing, and a sense of pressure in the face. Some people may be particularly sensitive to MSG, making it essential for food safety practices to identify and inform others about its presence in food.

In contrast, salt, black pepper, and sugar are generally recognized as safe and not classified as allergens. While it's possible for individuals to have sensitivities to these substances, they are not commonly associated with significant allergic reactions in the same way that MSG can be. Therefore, MSG is highlighted as a notable example of a common allergen within food safety and protection standards.