What should a nurse advise a client considering glucosamine if they have a shellfish allergy?

Clients with a shellfish allergy are advised to avoid glucosamine because many glucosamine supplements are derived from shellfish, particularly shrimp. Even if the product is labeled as glucosamine sulfate or glucosamine hydrochloride, there is a risk of cross-contamination during manufacturing, which could lead to an allergic reaction in sensitive individuals. Therefore, the safest course of action for someone with a shellfish allergy is to steer clear of glucosamine altogether to prevent any adverse health effects. This precaution highlights the importance of understanding the sources of dietary supplements and their potential risks in relation to allergies.