Best Supplements for Arthritis NZ: A Science-Backed Guide (2026)

According to Arthritis New Zealand, approximately 670,000 New Zealanders live with some form of arthritis — making it one of the leading causes of pain and disability in the country. For many people, managing arthritis is a long-term process that goes beyond prescribed medication. More and more are looking at what they eat, how they move, and what supplements might help them maintain joint function and quality of life. This guide covers five ingredients with genuine research support, what the evidence actually says about each, and how to think about combining them.

These supplements are not replacements for medical treatment. If you have been diagnosed with arthritis, your GP or specialist should be your first point of contact. What follows is an honest look at what the research supports as a complement to that care.

What to Look for in an Arthritis Supplement

Not all supplements are equal. Before spending money on anything, it's worth asking four questions. First: is there clinical evidence behind the ingredient, or is it based on marketing claims? Second: does the dose match what was actually used in the research? Third: is the product manufactured to GMP (Good Manufacturing Practice) standards — a baseline quality certification that ensures consistent formulation? Fourth: is the product made in New Zealand or imported? NZ manufacturing is subject to Medsafe oversight, which provides a meaningful quality assurance layer that many imported products lack. A cheap product at a high dose is often less effective than a well-formulated product at the clinically researched dose.

1. Green Lipped Mussel — New Zealand's Most Researched Marine Ingredient

Green lipped mussel (Perna canaliculus) is endemic to New Zealand — it grows nowhere else in the world. It has been studied for joint health since the 1970s, making it one of the most researched natural joint supplements available. Its anti-inflammatory properties come from a unique combination of compounds: eicosatetraenoic acid (ETA) — a rare omega-3 fatty acid not found in fish oil — alongside glycosaminoglycans (GAGs), chondroitin sulphate, glucosamine, and a complex lipid matrix.

The evidence base is credible. A 2021 systematic review (PMC8298224) analysed nine clinical trials examining Greenshell™ mussel extract in osteoarthritis patients. Five of those nine trials reported statistically significant improvements in joint pain and mobility. A 2022 randomised, double-blind, placebo-controlled trial by Abshirini et al., published in Frontiers in Medicine, found significant reductions in joint pain biomarkers in overweight postmenopausal women after 12 weeks of GLM supplementation — research conducted in partnership with Massey University.

GLM is best suited to people with osteoarthritis, morning joint stiffness, or general joint wear. Deep Blue Health's GlycOmega-Plus is an 8:1 standardised GLM concentrate with rosemary extract (from $29.90), while KUKU Mussel Oil offers the highest potency format available — CO2-extracted mussel oil equivalent to 27,000mg of fresh mussel per capsule. A straightforward entry point is the New Zealand Green Lipped Mussel Capsules — 100% pure GLM powder from $24.90.

Important: If you have a shellfish allergy, do not take green lipped mussel. This is a hard contraindication, not a precaution.

2. Marine Collagen — Supporting Cartilage from the Inside Out

Cartilage — the tissue that cushions your joints — is made primarily of Type I and Type II collagen. As we age, the body's ability to produce collagen declines, and cartilage can thin and degrade. Supplementing with collagen hydrolysate (collagen that has been broken down into small peptides the body can absorb) provides the building blocks the body needs to maintain and repair joint tissue.

A 2025 systematic review by Brueckheimer et al., published in Orthopedic Reviews, found that Type I collagen hydrolysate supplementation supports joint health, bone density, and muscle function, with a good safety profile across the studies reviewed. Marine collagen — derived from fish — is predominantly Type I collagen, and its smaller peptide size compared to bovine collagen is associated with good bioavailability and absorption.

Marine collagen is best for people focused on cartilage integrity and joint cushioning, and it has a secondary benefit for skin and connective tissue. It complements GLM well — GLM addresses inflammation and provides structural GAGs, while collagen directly supports the cartilage matrix. Deep Blue Health's Marine Collagen is sourced from marine fish and manufactured in New Zealand. Allow 8–12 weeks for noticeable effects — collagen works by gradual tissue support, not immediate relief.

3. Omega-3 Fatty Acids (Krill Oil) — Targeting Inflammation at the Source

Omega-3 fatty acids — specifically EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) — are among the most studied natural anti-inflammatory compounds in the world. They work by influencing the production of prostaglandins and leukotrienes, the chemical messengers that drive joint inflammation. A 2026 narrative review published on PubMed (PMC12618219) found that omega-3 supplementation is consistently associated with reduced joint inflammation markers across multiple intervention studies.

Krill oil is a particularly effective omega-3 source because it delivers EPA and DHA in phospholipid form — a structure closer to how omega-3 appears in human cell membranes, which research suggests improves plasma incorporation compared to the triglyceride form found in standard fish oil. Krill oil also contains astaxanthin, a natural antioxidant that protects the fatty acids from oxidation.

Omega-3 supplementation is particularly relevant for rheumatoid arthritis, where systemic inflammation is the primary driver, and it adds cardiovascular benefit alongside joint support. Deep Blue Health's Krill Oil provides 330mg of omega-3 per capsule (180mg EPA, 90mg DHA) in phospholipid form, from $32.90.

Note: If you are taking anticoagulant medication such as warfarin, speak with your GP before adding omega-3 supplements — they have a mild blood-thinning effect.

4. Glucosamine & Chondroitin — The Established Joint Support Duo

Glucosamine and chondroitin sulphate are natural components of joint cartilage and synovial fluid. They are among the most widely studied joint supplements and have been included in arthritis management guidelines in several countries. A 2025 systematic review by Baden et al., published in Nutrients, concluded that glucosamine and chondroitin show modest but consistent evidence for pain reduction in osteoarthritis, with a good long-term safety profile.

The evidence is perhaps less dramatic than some earlier research suggested, but the consistency across trials — and the safety record built up over decades of use — makes this combination a reasonable option for long-term joint maintenance, particularly for osteoarthritis.

One practical note: Deep Blue Health's green lipped mussel products — including GlycOmega-Plus — naturally contain chondroitin sulphate and glucosamine as part of their glycosaminoglycan profile. This means GLM delivers these compounds alongside ETA and the full lipid complex, rather than as isolated ingredients. For people considering both GLM and a separate glucosamine supplement, it's worth knowing that some overlap exists.

5. Boswellia — The Anti-Inflammatory Botanical Worth Knowing

Boswellia serrata is an Ayurvedic herb that has attracted increasing clinical attention for joint health. Its active compounds — Boswellic acids — inhibit 5-LOX (5-lipoxygenase), an enzyme involved in the production of leukotrienes, which are inflammatory molecules implicated in joint pain. This mechanism is distinct from both NSAIDs and omega-3 fatty acids, which is why Boswellia is often considered a useful addition to a supplement stack rather than a standalone option.

A 2025 randomised controlled trial published in Pharmaceutical Research found significant improvement in knee osteoarthritis pain and cartilage degeneration markers in the Boswellia group versus placebo. The results were clinically meaningful and the safety profile was good.

To be transparent: Deep Blue Health does not currently sell a Boswellia product. We mention it here because this guide is intended to be genuinely useful, not to list only what we sell. If you are exploring a comprehensive arthritis supplement approach, Boswellia is worth considering alongside GLM — the two work through complementary inflammatory pathways and there is reasonable evidence supporting their combination.

How to Choose the Right Supplement for Your Type of Arthritis

The type of arthritis you have matters. Here are three practical starting points:

• Osteoarthritis (OA) — cartilage wear and localised joint pain: Start with green lipped mussel (GlycOmega-Plus) for the anti-inflammatory lipid complex and naturally occurring GAGs, and add Marine Collagen for direct cartilage matrix support. This combination addresses both the inflammation and structural aspects of OA.
• Rheumatoid Arthritis (RA) — systemic autoimmune inflammation: Omega-3 fatty acids (krill oil) have the strongest evidence base here, with green lipped mussel as a complementary option for additional ETA and joint-specific support. Always work alongside your rheumatologist's treatment plan — RA management is more complex than OA and supplements should never replace prescribed therapy.
• General joint health maintenance — active people or those in early-stage joint decline: Green lipped mussel combined with krill oil covers both the structural and systemic anti-inflammatory angles, and is a sensible long-term daily combination for adults over 40 who want to protect their joints proactively.

What to Realistically Expect

The most common reason people give up on joint supplements too early is expecting them to work like ibuprofen. They don't — and that's not a failing. These supplements work through gradual modulation of inflammation, cartilage support, and joint tissue maintenance. They're building a better environment for your joints over time, not providing acute pain relief.

Most people taking GLM or collagen notice something within 4–8 weeks of consistent daily use. Twelve weeks is the benchmark used in most clinical trials, and it's a reasonable timeframe to assess whether a supplement is working for you. A simple way to track progress: note how stiff your joints feel in the first 30 minutes after waking each morning. That's often the first thing to improve.

Consistency matters more than dose size. Taking the right dose every day for three months will outperform an aggressive dose taken sporadically.

Important Safety Notes

• Shellfish allergy: Do not take green lipped mussel or krill oil if you have a diagnosed shellfish allergy.
• Blood thinners: Omega-3 supplements (including krill oil) have a mild anticoagulant effect. If you are taking warfarin or another blood-thinning medication, consult your GP before starting.
• Pregnancy and breastfeeding: Consult your GP or midwife before adding any supplement during pregnancy or breastfeeding.
• Prescribed medication: If you are on any prescription medication for arthritis or other conditions, always check with your GP or pharmacist before adding supplements — interactions are uncommon but possible.
• These supplements complement — they do not replace — medical treatment. Arthritis NZ's guidance on complementary therapies is a useful reference: arthritis.org.nz.

Frequently Asked Questions

What is the best natural supplement for arthritis in New Zealand?

There's no single best answer — it depends on your type of arthritis and your primary symptoms. For osteoarthritis (the most common type), green lipped mussel has the strongest NZ-specific research base, particularly GlycOmega-Plus and similar standardised extracts. A 2021 systematic review of nine clinical trials found five showed significant improvement in OA pain and mobility. Marine collagen is a strong complementary choice for cartilage support. For rheumatoid arthritis, omega-3 fatty acids (krill oil) are better supported by the evidence. Starting with one supplement and adding a second after 8 weeks is a practical approach — it also helps you understand which is making a difference.

How long do arthritis supplements take to work?

Most clinical trials on joint supplements show meaningful results at 8–12 weeks of consistent daily use. Some people notice improvement in morning stiffness within 4–6 weeks, particularly with green lipped mussel. Collagen supplements tend to take the longest — cartilage remodelling is a slow process, and 12 weeks is a minimum before drawing conclusions. These supplements are not fast-acting pain relievers. If you're looking for day-to-day pain management, discuss that separately with your GP. What supplements do well is reduce baseline inflammation and support joint tissue over time — a different mechanism with a different timeframe.

Can I take multiple arthritis supplements at the same time?

Yes, in most cases. The supplements covered in this guide — green lipped mussel, marine collagen, krill oil — work through different mechanisms and are commonly taken together without issue. In fact, GLM and krill oil are a natural combination: GLM provides ETA and GAGs for joint-specific support, while krill oil adds higher-volume EPA and DHA for systemic anti-inflammatory benefit. The main thing to watch for is cumulative omega-3 from multiple sources if you are on blood thinners. If you are on any prescription medication, check with your GP before combining supplements.

Where to Start

If you're ready to try a supplement approach for arthritis or joint health, here's where we'd suggest beginning. For osteoarthritis and joint stiffness: GlycOmega-Plus is our most researched GLM product, or step up to KUKU Mussel Oil for the highest potency available. For cartilage support alongside GLM: Marine Collagen. For systemic inflammation and omega-3 support: Krill Oil. All Deep Blue Health products are sourced and manufactured in New Zealand to GMP standard.

References

• Arthritis New Zealand. Herbs and supplements. https://www.arthritis.org.nz/living-with-arthritis/complementary-therapies/herbs-and-supplements
• PMC8298224 (2021). Green-lipped (Greenshell™) mussel (Perna canaliculus) extract supplementation in treatment of osteoarthritis: a systematic review. https://pmc.ncbi.nlm.nih.gov/articles/PMC8298224/
• Abshirini, M. et al. (2022). Effects of Greenshell™ mussel intervention on biomarkers of cartilage metabolism, inflammatory markers and joint symptoms in overweight/obese postmenopausal women. Frontiers in Medicine, 9, 1063336. https://doi.org/10.3389/fmed.2022.1063336
• Brueckheimer, P.J. et al. (2025). The Effects of Type I Collagen Hydrolysate Supplementation on Bones, Muscles, and Joints: A Systematic Review. Orthopedic Reviews, 17. PMC11842160. https://orthopedicreviews.openmedicalpublishing.org/article/129086
• Baden, K.E.R. et al. (2025). The Safety and Efficacy of Glucosamine and/or Chondroitin in Humans: A Systematic Review. Nutrients, 17(13), 2093. https://www.mdpi.com/2072-6643/17/13/2093
• PMC12618219 (2026). Lifestyle Interventions and Supplements for Joint and Arthritis Pain. https://pmc.ncbi.nlm.nih.gov/articles/PMC12618219/
• Pharmaceutical Research (2025). Efficacy and Safety of Boswellia serrata and Apium graveolens L. Extract Against Knee Osteoarthritis. https://doi.org/10.1007/s11095-025-03818-2