Glucosamine

Also known as: glucosamine sulfate, glucosamine hcl, glucosamine hydrochloride

Grade B — Moderate Evidencejointrecovery
1500–1500 mgWith meals, can be split into 500mg 3x/day or taken as single dose

Building block for cartilage with solid evidence for knee osteoarthritis pain and function. Glucosamine sulfate is the preferred form. Takes weeks to show benefit. Safe long-term with few interactions.

💪Muscle & Recovery
Last reviewed: 2026-03-12

Quick Facts

Evidence

Grade B

Studies

2

Interactions

2

Forms

1

Evidence Rating: Grade B — Moderate Evidence

Some RCTs with positive results, or strong observational evidence. More research may refine our understanding.

Interaction Warnings

Blood thinners (warfarin)Moderate

May increase INR and bleeding risk when combined with warfarin.

Diabetes medicationsLow

Older concerns about blood sugar elevation largely unsupported by modern studies, but monitor glucose.

Important Notes

  • Derived from shellfish — contraindicated in severe shellfish allergy (vegan forms available)
  • Sulfate form has stronger evidence than HCl form
  • May take 4-8 weeks for noticeable benefit
  • Often combined with chondroitin for synergistic effects

Clinical Evidence (2 studies)

Glucosamine for knee osteoarthritis: an updated meta-analysis

Simental-Mendia M et al. (2018) — Int J Rheum Dis

Glucosamine sulfate significantly reduced pain and improved function in knee osteoarthritis

View on PubMed

Dietary supplements for treating osteoarthritis: a systematic review and meta-analysis

Liu X et al. (2017) — Br J Sports Med

Glucosamine showed clinically meaningful pain reduction in OA, particularly the sulfate form

View on PubMed

Alternatives to Consider

These supplements target similar goals and may be worth considering alongside or instead of Glucosamine.

Magnesium Glycinate

Grade A

Highly bioavailable form of magnesium. Strong evidence for sleep quality, muscle relaxation, and stress reduction. Most adults are deficient.

💪 Muscle & Recovery

Tart Cherry

Grade B

Natural source of melatonin and anti-inflammatory compounds. Evidence for sleep quality improvement and one of the best supplements for DOMS reduction.

💪 Muscle & Recovery

Glutamine

Grade B

Conditionally essential amino acid that is the primary fuel for gut lining cells. RCT evidence for IBS and leaky gut.

💪 Muscle & Recovery

Related Supplements

Chondroitin

Grade B — Moderate Evidence

Major component of cartilage with evidence for osteoarthritis symptom relief. Often combined with glucosamine for synergistic benefit. Pharmaceutical-grade chondroitin sulfate (as used in European studies) may be more effective than many OTC products.

MSM (Methylsulfonylmethane)

Grade C — Preliminary

Organic sulfur compound with evidence for joint pain relief in osteoarthritis. Extremely safe with very few interactions. Also used for skin and hair health due to its role in keratin and collagen synthesis. Often stacked with glucosamine and chondroitin.

Magnesium Glycinate

Grade A — Strong Evidence

Highly bioavailable form of magnesium. Strong evidence for sleep quality, muscle relaxation, and stress reduction. Most adults are deficient.

Tart Cherry

Grade B — Moderate Evidence

Natural source of melatonin and anti-inflammatory compounds. Evidence for sleep quality improvement and one of the best supplements for DOMS reduction.

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⚕️ Important Disclaimer

This information is for educational purposes only. It is not medical advice. Always consult a healthcare provider before starting any supplement regimen, especially if you take medications or have health conditions.

DoseGrade does not sell supplements and has no affiliate relationships with supplement manufacturers.