Glucosamine sulfate is LIKELY SAFE when used appropriately by mouth in adults.
Glucosamine sulfate is POSSIBLY SAFE when injected into the muscle as a shot twice weekly for up to 6 weeks or when applied to the skin in combination with chondroitin sulfate, shark cartilage, and camphor for up to 8 weeks.
Glucosamine sulfate can cause some mild side effects including nausea, heartburn, diarrhea, and constipation. Uncommon side effects are drowsiness, skin reactions, and headache. These are rare.
Special Precautions & Warnings:
Pregnancy or breast-feeding: There is not enough reliable scientific information available to know if glucosamine sulfate is safe to take during pregnancy or while breast-feeding. Until more is known, do not take glucosamine sulfate while pregnant or breast-feeding.
Asthma: There is one report linking an asthma attack with taking glucosamine. It is not known for sure if glucosamine was the cause of the asthma attack. Until more is known, people with asthma should be cautious about taking products that contain glucosamine.
Diabetes: Some early research suggested that glucosamine sulfate might raise blood sugar in people with diabetes. However, more recent and more reliable research now shows that glucosamine sulfate does not seem to affect blood sugar control in people with type 2 diabetes. Glucosamine appears to be safe for most people with diabetes, but blood sugar should be monitored closely.
High cholesterol: Animal research suggests that glucosamine may increase cholesterol levels. In contrast, glucosamine does not seem to increase cholesterol levels in humans. However, some early research suggests that glucosamine might increase insulin levels. This might cause cholesterol levels to increase. To be cautious, if you take glucosamine sulfate and have high cholesterol. Monitor your cholesterol levels closely.
High blood pressure: Early research suggests that glucosamine sulfate can increase insulin levels. This might cause blood pressure to increase. However, more reliable research suggests that glucosamine sulfate does not increase blood pressure. To be cautious, if you take glucosamine sulfate and have high blood pressure, monitor your blood pressure closely.
Shellfish allergy: Because some glucosamine sulfate products are made from the shells of shrimp, lobsters or crabs, there is concern that glucosamine products might cause allergic reactions in people who are allergic to shellfish. However, allergic reactions in people with shellfish allergy are typically caused by the meat of shellfish, not the shell. There are no reports of allergic reactions to glucosamine in people who are allergic to shellfish. There is also some information that people with shellfish allergy can safely take glucosamine products.
Surgery: Glucosamine sulfate might affect blood sugar levels and might interfere with blood sugar control during and after surgery. Stop taking glucosamine sulfate at least 2 weeks before a scheduled surgery.
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This copyrighted material is provided by Natural Medicines Comprehensive Database. Information from this source is evidence-based and objective, and without commercial influence.