Glucosamine

Structural proteins and connective-tissue compounds commonly used in joint, tendon, skin, and cartilage support products.

Page last reviewed: 2026-07-23 - next review due: 2027-01-23

Source Coverage

Included: US reference

Review gap: Canadian reference

Add or verify Health Canada context where an official Canadian reference exists.

Review gap: EU reference

Add or verify EFSA or EU health-claim context where an official EU reference exists.

Included: Clinical / safety source

Function

Amino sugar used in glycosaminoglycan synthesis in cartilage and connective tissue.

Natural Sources

Shellfish shells are the common supplement source; meaningful amounts are not typically obtained from ordinary foods.

Food vs Supplement Context

Natural sources describe where this item appears in foods, culinary ingredients, or traditional preparations. Concentrated supplements can differ by dose, extract type, preparation, standardization, and medication context, so they should be evaluated separately.

Testing & Monitoring Context

No routine lab test establishes a required daily need for most foods and bioactives; monitoring is usually based on the intended outcome, dose, medical history, and adverse effects.

Suggested Guidelines When Purchasing

What to look for: Prefer a product identity that matches the studied ingredient or ordinary food source described on this page.

Use caution or avoid: Avoid products that hide dose, source, standardization, allergens, or safety-relevant ingredients.

Prefer ordinary food sources first when they provide the intended compound in a practical way.
For supplements, require clear labeling of active ingredient, dose per serving, serving size, and other ingredients.
Prefer products with third-party testing or transparent contaminant testing, especially for concentrated extracts, algae, mushrooms, minerals, and sports products.
Do not let marketing claims override the evidence, safety flags, source coverage, or dose context on this page.

Intake Guidance

No official DRI

No official RDA, AI, or RDI has been established for this bioactive as a required daily intake.

Evidence Summary

Knee osteoarthritis symptoms and structure

Promising

Recent systematic-review evidence is mixed: some analyses report benefits for glucosamine sulfate or chondroitin sulfate, while combination effects are less consistent.

Dose context: Products differ by salt form and dose; do not generalize one product to all glucosamine supplements.

Caution: Shellfish allergy, anticoagulants, diabetes medication contexts, and surgery deserve review.

Studies/sources: Evaluation of Efficacy and Safety of Glucosamine Sulfate, Chondroitin Sulfate, and Their Combination in Knee Osteoarthritis (2026-07-26), Clinical Efficacy and Safety of Chondroitin Combined With Glucosamine in Knee Osteoarthritis (2026-07-26)

Evidence Legend

Established use: Supported by official guidance, regulatory claim context, strong consensus, or repeated human evidence for a specific use.

Promising: Human studies or reviews suggest benefit for specific outcomes, but evidence is not broad enough to treat as settled general guidance.

Emerging: Early human, mechanistic, or mixed evidence; worth tracking, but not strong enough for confident user-facing claims.

Traditional use: Historically or traditionally used, but modern clinical evidence may be limited, mixed, or product-specific.

Category example: Included to describe a supplement or food category, not because a strong health claim is attached yet.

Research Links

Use this as a research discovery link. Search results are live and may change, so curated sources on this page remain the fixed references for app content.