Home Ingredients GreenGrown® (Vegetarian Glucosamine — Ethical Naturals)
Joint Health

GreenGrown® (Vegetarian Glucosamine — Ethical Naturals)

Evidence Level
Moderate
1 Clinical Trial
3 Documented Benefits
3/5 Evidence Score

GreenGrown® is a 100% vegetable-source glucosamine from Ethical Naturals, made by fermenting non-GMO corn rather than from shellfish. It is molecularly identical to shellfish glucosamine but vegan and shellfish-allergen-free, used to support joint comfort and cartilage health.

Studied Dose Commonly 1,500 mg of glucosamine per day.
Active Compound Glucosamine (sulfate or hydrochloride) produced by fermentation of non-GMO corn (vegetable source). Clinical support is strongest for the glucosamine sulfate form; evidence for the hydrochloride form is more limited.

Benefits

Joint comfort

Glucosamine is one of the most widely used joint supplements, studied for supporting comfort and function in the knees and other joints.

Supported by Trial 1

Cartilage support

Glucosamine is a building block of cartilage and joint fluid, and is taken to support cartilage maintenance.

Supported by Trial 1

Vegan, allergen-free source

GreenGrown delivers glucosamine without shellfish, suiting vegetarians, vegans, and people with shellfish allergies.

Supported by Trial 1

Mechanism of action

1

Cartilage substrate

Glucosamine supplies a precursor for glycosaminoglycans and proteoglycans, the molecules that give cartilage its cushioning structure.

2

Joint-fluid support

Glucosamine supports the production of components of synovial fluid that lubricate and protect the joint.

Clinical trials

1
Glucosamine-Based Combination Therapies for Knee Osteoarthritis — Network Meta-Analysis
PubMed

Systematic review and network meta-analysis of glucosamine-based therapies for knee osteoarthritis pain. (Sumsuzzman et al. 2024, Journal of Clinical Medicine)

Adults with knee osteoarthritis across multiple trials.

Glucosamine-based therapies were associated with improved knee osteoarthritis pain; GreenGrown is a vegetable-source glucosamine.

Side effects and drug interactions

Common Potential side effects

Generally well-tolerated.
Mild digestive upset is occasionally reported.
People with diabetes can monitor blood sugar as a precaution.

Important Drug interactions

Warfarin — glucosamine may enhance its blood-thinning effect; monitor.
Diabetes medication — monitor blood sugar as a precaution.
Tell your doctor about all supplements if you take medication.

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Frequently asked questions about GreenGrown® (Vegetarian Glucosamine — Ethical Naturals)

What is GreenGrown?

GreenGrown® is a 100% vegetable-source glucosamine from Ethical Naturals, made by fermenting non-GMO corn rather than from shellfish. It is molecularly identical to shellfish glucosamine but vegan and shellfish-allergen-free, used to support joint comfort and cartilage health.

What is GreenGrown used for?

GreenGrown is researched primarily for Joint Health. Glucosamine is one of the most widely used joint supplements, studied for supporting comfort and function in the knees and other joints.

What is the recommended dosage of GreenGrown?

The clinically studied dose is Commonly 1,500 mg of glucosamine per day. Always follow the product label and check with a healthcare provider for personal advice.

Is GreenGrown safe, and does it have side effects?

For most healthy adults, GreenGrown is well tolerated at studied doses. Reported effects can include: Generally well-tolerated. Mild digestive upset is occasionally reported. It may also interact with some medications. GreenGrown is not right for everyone, so check with a healthcare provider first if you are pregnant or breastfeeding, have a medical condition, or take prescription medication.

Does GreenGrown interact with any medications?

Possible interactions include: Warfarin — glucosamine may enhance its blood-thinning effect; monitor. Diabetes medication — monitor blood sugar as a precaution. If you take prescription medication, check with a pharmacist or doctor before using it.

How strong is the scientific evidence for GreenGrown?

NutraSmarts rates the evidence for GreenGrown as Moderate (3 out of 5). It is backed by 1 clinical trial and 1 cited reference summarized on this page. A higher rating reflects more, larger, and better-designed human studies.

References(1 citations)

Evidence ratings on NutraSmarts are based on the totality of human clinical research, with emphasis on randomized controlled trials, meta-analyses, and systematic reviews. The references below directly support claims made throughout this page.

  1. Sumsuzzman DM, Khan ZA, Jung JH, et al. Comparative Efficacy of Glucosamine-Based Combination Therapies in Alleviating Knee Osteoarthritis Pain: A Systematic Review and Network Meta-Analysis. J Clin Med. 2024;13(23)..PubMedUsed to support: Network meta-analysis supporting glucosamine for knee osteoarthritis pain (GreenGrown is vegetable-source glucosamine).