If a client asks if it is safe to take glucosamine supplements, which allergy should be considered?

When considering whether it is safe for a client to take glucosamine supplements, it is important to recognize that a significant portion of glucosamine on the market is derived from shellfish. This means that individuals with a shellfish allergy may experience allergic reactions when taking these supplements. Therefore, it is crucial to assess the client's allergy history, particularly for shellfish, to avoid any adverse reactions.

In this context, while allergies to nuts, dairy, and wheat are important to consider for other supplements or dietary choices, they are not directly related to glucosamine, which predominantly has shellfish as a potential allergen.