Glucosamine Sulfate
Also known as: Glucosamine, GlcN, 2-Amino-2-deoxy-D-glucose
An amino monosaccharide serving as the essential substrate for biosynthesis of glycosaminoglycans and proteoglycans, the structural macromolecules of articular cartilage extracellular matrix.
Last reviewed: 2024-03-20 · 1 indexed study
Set your location for accurate regulatory status
Saved on this device — no sign-in needed.
Overview
Glucosamine sulfate is an amino sugar and precursor to glycosaminoglycans (GAGs), the primary structural components of cartilage. It is one of the most widely used joint health supplements globally.
Mechanism & Function
Off-white crystalline amino sugar (typically as KCl or NaCl complex for stability).
- Capsule
- Tablet
- Powder
- Liquid
Capsule is generally preferred for bioavailability or efficacy.
Mechanism of Action
Provides substrate for glycosaminoglycan (GAG) and proteoglycan synthesis in chondrocytes. May inhibit NF-κB-mediated inflammatory signaling in synovial tissue and stimulate hyaluronic acid synthesis by synoviocytes.
Physiological Role
Endogenous glucosamine is synthesized from glucose and glutamine via the hexosamine biosynthetic pathway. It is the rate-limiting substrate for GAG synthesis critical to cartilage hydration and shock absorption.
Primary Pathways
Performance / Health Relevance
Long-term supplementation may preserve cartilage in athletes exposed to high joint loading. Most relevant for runners, lifters, and contact sport athletes over age 30.
Evidence Review
Practical Use & Dosage
- Minimum Effective Dose
- 1000mg/day glucosamine sulfate
- Optimal Range
- 1500mg/day (500mg 3x daily or 1500mg once daily)
- Upper / Caution Level
- 3000mg/day
- Timing
- With meals; once daily is as effective as split dosing
- Best Format
- Crystalline glucosamine sulfate (Rotta formulation)
- Bioavailability
- Oral bioavailability ~26%. Sulfate salt form is better studied and may be more effective than HCl form. Crystalline formulation used in positive trials.
- Absorption Considerations
- Absorbed via SGLT1 and GLUT2 transporters. Food does not significantly impact absorption.
Safety & Interactions
Side Effects
- •Mild GI upset
- •Heartburn (rare)
- •Drowsiness (rare)
Contraindications
- Shellfish allergy (for shellfish-derived forms)
Drug Interactions
- •Warfarin (may increase INR — monitor)
- •Antidiabetic drugs (may affect glucose metabolism)
Who Should Avoid
- •Shellfish allergy (use synthetic or corn-derived)
- •Pregnancy (insufficient data)
Monitoring
Monitor blood glucose in diabetics. Check INR if on warfarin. Effects take 4–12 weeks to manifest.
Frequently Asked Questions
Auto-generated from indexed evidence — dosage, safety, interactions, and more.
When is Glucosamine Sulfate typically used or indicated?
Glucosamine Sulfate is most commonly used for: Osteoarthritis, Joint pain, Cartilage support, Preventive joint care. Endogenous glucosamine is synthesized from glucose and glutamine via the hexosamine biosynthetic pathway. It is the rate-limiting substrate for GAG synthesis critical to cartilage hydration and shock absorption.
How does Glucosamine Sulfate work?
Provides substrate for glycosaminoglycan (GAG) and proteoglycan synthesis in chondrocytes. May inhibit NF-κB-mediated inflammatory signaling in synovial tissue and stimulate hyaluronic acid synthesis by synoviocytes.
What is the recommended dose of Glucosamine Sulfate?
The optimal range is 1500mg/day (500mg 3x daily or 1500mg once daily). with a minimum effective dose of 1000mg/day glucosamine sulfate. Best taken: With meals; once daily is as effective as split dosing. Upper / caution level: 3000mg/day.
What are the side effects of Glucosamine Sulfate?
Reported side effects include: Mild GI upset; Heartburn (rare); and Drowsiness (rare). Monitoring: Monitor blood glucose in diabetics. Check INR if on warfarin. Effects take 4–12 weeks to manifest.
Does Glucosamine Sulfate interact with medications?
Known or theoretical interactions: Warfarin (may increase INR — monitor); and Antidiabetic drugs (may affect glucose metabolism). Always check with a clinician before combining with prescription medication.
Who should avoid Glucosamine Sulfate?
Glucosamine Sulfate is generally not recommended for: Shellfish allergy (use synthetic or corn-derived); Pregnancy (insufficient data); and Shellfish allergy (for shellfish-derived forms).
How strong is the evidence for Glucosamine Sulfate?
Evidence level: Moderate (overall score 62/100), based on 1 indexed study on SuppIndex.
Research & References (1)
Glucosamine sulfate for osteoarthritis: a Cochrane systematic review
Cochrane review showing glucosamine sulfate (Rotta preparation) reduced pain and improved function in knee osteoarthritis vs placebo.
Trademark Ingredients
Related Ingredients
Other top-rated ingredients in Joint and Recovery Ingredients.
Collagen Peptides
70/100Enzymatically hydrolyzed type I and III collagen yielding low-molecular-weight peptides (primarily glycine-proline-hydroxyproline tripeptides) that are absorbed intact and stimulate fibroblast collagen synthesis.
Tart Cherry Extract
58/100A polyphenol-rich extract of Prunus cerasus containing anthocyanins (cyanidin glycosides) and trace melatonin, exhibiting anti-inflammatory, antioxidant, and uricosuric properties.
TUDCA
56/100Conjugate of taurine and ursodeoxycholic acid; reduces cytotoxic bile acid pool, protects mitochondria, and inhibits ER stress-induced apoptosis.
Research Overview
Moderate EvidenceCite this ingredient
One-click citation export in APA, MLA, Chicago, BibTeX, or HTML. The URL below is stable and safe to link.
Stable URL
https://thesuppindex.com/ingredients/glucosamine-sulfate
SuppIndex. (2026). Glucosamine Sulfate: Evidence summary, dosage and clinical studies. Retrieved October 23, 2026, from https://thesuppindex.com/ingredients/glucosamine-sulfate
Based on 1 indexed studies · Evidence level: Moderate.
Goal Ratings
Stack Compatibility
Classic combination with chondroitin sulfate and MSM. Pairs well with collagen peptides and omega-3.