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SUPPLEMENT_SCHOLAR
evidence · mechanism · dose
Supplements/Compound

Glucosamine

aka Glucosamine sulfate · Glucosamine HCl

Cartilage building block; sulfate form has evidence for OA pain reduction.

Joint & Connective Tissue

Overview

Cartilage building block; sulfate form has evidence for OA pain reduction.

Natural sources
  • Shellfish chitin
  • Vegetarian fermentation
Common forms
  • Glucosamine sulfate (preferred)
  • Glucosamine HCl

Mechanism of action

Substrate for glycosaminoglycan synthesis; sulfate may modulate proteoglycan synthesis.

Pathways
  • · GAG synthesis

Effects on the body

Supports
Cartilage matrix
Decreases
OA pain (sulfate)

Organ system effects

Joints

Modest pain relief in knee OA.

Evidence-based benefits

Reduces knee OA pain (sulfate form)

Moderate evidence

Potential side effects

Common
  • · GI upset
Rare
    Serious

      Drug interactions

      Warfarin
      May increase INR.
      moderate

      Supplement interactions

      Pairs well with
      • Chondroitin
        Often co-formulated; modest synergy.
      Avoid combining with

      No specific avoidances listed.

      Dosing & bioavailability

      Typical dose
      1500 mg glucosamine sulfate/d

      Where to buy

      Affiliate-style search links to reputable retailers. We don't endorse specific brands — verify third-party testing (USP, NSF, Informed Sport) before purchase.

      Compound
      Glucosamine
      Amazon
      Wide selection · fast shipping
      Compound
      Glucosamine
      iHerb
      Global delivery · curated brands
      Compound
      Glucosamine
      Thorne
      Practitioner-grade · NSF tested

      Scientific evidence (8)

      Meta-analysisCochrane Database · 2005

      Glucosamine for osteoarthritis

      Towheed TE, et al.

      Cochrane review of glucosamine in OA.

      Key findings

      Pharmaceutical-grade glucosamine sulfate improves pain and function.

      Open study
      Systematic reviewPubMed (NLM) · 1970

      PubMed: Glucosamine — Reduces knee OA pain

      Live PubMed search

      Live results for "Glucosamine Reduces knee OA pain" across the PubMed/MEDLINE peer-reviewed index.

      Key findings

      Opens current human and preclinical literature matching Glucosamine and "Reduces knee OA pain". Filter by RCT, meta-analysis, or year on the results page.

      Open study
      Systematic reviewPubMed (NLM) · 1970

      PubMed: Glucosamine — randomized controlled trial

      Live PubMed search

      Live results for "Glucosamine randomized controlled trial" across the PubMed/MEDLINE peer-reviewed index.

      Key findings

      Opens current human and preclinical literature matching Glucosamine and "randomized controlled trial". Filter by RCT, meta-analysis, or year on the results page.

      Open study
      Systematic reviewPubMed (NLM) · 1970

      PubMed: Glucosamine — meta-analysis

      Live PubMed search

      Live results for "Glucosamine meta-analysis" across the PubMed/MEDLINE peer-reviewed index.

      Key findings

      Opens current human and preclinical literature matching Glucosamine and "meta-analysis". Filter by RCT, meta-analysis, or year on the results page.

      Open study
      Systematic reviewPubMed (NLM) · 1970

      PubMed: Glucosamine — pharmacokinetics

      Live PubMed search

      Live results for "Glucosamine pharmacokinetics" across the PubMed/MEDLINE peer-reviewed index.

      Key findings

      Opens current human and preclinical literature matching Glucosamine and "pharmacokinetics". Filter by RCT, meta-analysis, or year on the results page.

      Open study
      Systematic reviewPubMed (NLM) · 1970

      PubMed: Glucosamine — safety adverse events

      Live PubMed search

      Live results for "Glucosamine safety adverse events" across the PubMed/MEDLINE peer-reviewed index.

      Key findings

      Opens current human and preclinical literature matching Glucosamine and "safety adverse events". Filter by RCT, meta-analysis, or year on the results page.

      Open study
      Systematic reviewPubMed (NLM) · 1970

      PubMed: Glucosamine — dose response

      Live PubMed search

      Live results for "Glucosamine dose response" across the PubMed/MEDLINE peer-reviewed index.

      Key findings

      Opens current human and preclinical literature matching Glucosamine and "dose response". Filter by RCT, meta-analysis, or year on the results page.

      Open study
      Systematic reviewGoogle Scholar · 1970

      Google Scholar: Glucosamine — clinical evidence

      Live Scholar search

      Cross-database citation index for Glucosamine as it relates to "clinical evidence".

      Key findings

      Includes preprints, theses, and journal articles. Useful for tracking citation counts and follow-on work.

      Open study
      Educational use only. This profile is not medical advice. Consult a qualified healthcare professional before starting any supplement, especially if you take prescription medication or have a chronic condition.