5 Essential Supplements for Active Kiwis Over 40
Quick answer: For active New Zealanders over 40, the five evidence-based supplements most worth considering are: NMN (NAD+ precursor, 250-500mg/day), magnesium glycinate or amino-acid-chelate (400mg elemental), green lipped mussel (1,000mg, NZ-specific anti-inflammatory ETA), vitamin D3 (1,000-2,000 IU during NZ winters), and omega-3 EPA/DHA. NAD+ levels can decline 40-50% between ages 20 and 50 (Massudi et al., 2012, PMC4112140), making cellular energy support a priority for this age group.
Age is just a number — but biology doesn't always agree. Here are the five supplements that may help you stay strong, sharp, and mobile well past 40.
Turning 40 is a milestone most Kiwis approach with a mix of wisdom and the occasional groan when getting off the couch. You might still feel mentally sharp and motivated to stay active, but your body has started quietly changing the rules.
Recovery takes longer. Joints creak in the morning. Sleep isn't as deep. Energy dips earlier in the afternoon. And that niggling shoulder injury from touch rugby? It's been lingering for three months now instead of the usual three weeks.
These aren't signs of decline — they're signals. Your body is telling you it needs different support than it did in your twenties. The good news? With the right nutritional strategy, including targeted supplementation, you can maintain an active, high-energy lifestyle well into your fifties, sixties, and beyond.
Here are the five supplements we believe every active Kiwi over 40 should consider.
What Changes After 40?
Before diving into the supplements, it helps to understand what's actually happening in your body from your early forties onward:
- NAD+ levels decline significantly — this coenzyme, essential for cellular energy production and normal cellular maintenance, may drop by 50% or more between ages 20 and 50
- Muscle mass decreases — sarcopenia (age-related muscle loss) begins as early as 30 and accelerates after 40, with an average loss of 3–8% per decade
- Joint cartilage thins — the cartilage protecting your joints loses water content and resilience, increasing reduced flexibility and susceptibility to wear
- Bone density reduces — particularly in women approaching menopause, but men are affected too. Vitamin D and calcium metabolism become less efficient
- Inflammation increases — chronic low-grade inflammation ("inflammaging") rises with age and is linked to virtually every age-related condition
- Hormonal shifts occur — testosterone and oestrogen decline, affecting energy, mood, body composition, and recovery
- Magnesium depletion worsens — absorption decreases while excretion increases, creating a growing deficit in a mineral you need more than ever
None of this means you have to slow down. It means you need to be smarter about supporting your body. Supplements won't stop ageing, but the right ones can help you age on your terms.
Active Aucklanders over 40 often combine targeted supplementation with regular care at a sports chiropractor in Auckland to keep joints mobile and recovery efficient.
Supplement #1: NMN (Nicotinamide Mononucleotide)
Why it matters after 40: NAD+ — the coenzyme at the centre of cellular energy production — declines sharply from your late thirties. Lower NAD+ levels mean less efficient mitochondria, slower normal cellular maintenance, reduced sirtuin activity, and a general decline in cellular vitality. You feel this as lower energy, slower recovery, and reduced mental sharpness.
NMN is a direct precursor to NAD+, sitting just one enzymatic step away. Supplementing with NMN has been shown in clinical trials to raise blood NAD+ levels, with studies demonstrating improvements in exercise capacity, insulin sensitivity, and muscle function in middle-aged and older adults.
What the research says:
- A 2022 study in Cell Metabolism found that NMN supplementation supported metabolic health markers in women — a particularly relevant finding for the over-40 demographic
- Multiple trials show improved aerobic capacity and reduced fatigue in adults over 40 taking NMN daily
- Animal studies consistently demonstrate improvements in vascular health, cognitive function, and metabolic markers with NMN supplementation
What to look for: A research-supported dose of 500mg per day, in β-NMN form. WIIP NMN Boost delivers exactly this — 500mg of pure NMN per serving, made in New Zealand.
Best time to take: Morning, on an empty stomach, to align with your body's natural NAD+ circadian rhythm.
Supplement #2: Magnesium (Glycinate Form)
Why it matters after 40: Magnesium is involved in over 300 biochemical reactions in your body, including muscle contraction, nerve function, energy production, protein synthesis, and blood sugar regulation. After 40, your intestinal absorption of magnesium decreases while your kidneys excrete more of it. The result? A growing magnesium deficit that affects everything from sleep quality to exercise recovery.
Studies suggest that up to 70% of New Zealanders may not meet the recommended daily intake for magnesium. For active adults over 40, the gap is likely even wider due to increased losses through sweat and higher physiological demand.
Key benefits for the over-40 demographic:
- Muscle comfort and relaxation support — magnesium regulates muscle contraction and relaxation. Low levels contribute to cramps, spasms, and prolonged DOMS
- Sleep quality — magnesium supports GABA activity in the brain, promoting relaxation and deeper sleep. Sleep quality often deteriorates after 40, making this benefit particularly valuable
- Blood sugar regulation — magnesium supports insulin sensitivity, which naturally decreases with age
- Heart health — adequate magnesium contributes to normal cardiovascular function
- Bone health — 60% of your body's magnesium is stored in bone. It's essential for calcium metabolism and bone density maintenance
Form matters: Magnesium glycinate is one of the most bioavailable forms, with superior absorption compared to cheaper alternatives like magnesium oxide. The glycinate form is also gentle on the stomach and has calming properties from the amino acid glycine.
WIIP Muscle Relax delivers 400mg of magnesium glycinate — a clinically effective daily dose for active adults.
Best time to take: Evening, 1–2 hours before bed.
Supplement #3: Joint Support (Green Lipped Mussel + Vitamin D3)
Why it matters after 40: Joint health becomes a real concern once you pass 40. Cartilage — the smooth, shock-absorbing tissue that cushions your joints — naturally thins and loses its ability to retain water. Synovial fluid production decreases. The result is reduced flexibility, reduced mobility, and a greater likelihood of discomfort during and after activity.
For active Kiwis who run, play sport, lift weights, or enjoy hiking, joint health isn't just about comfort — it's about staying active long-term. If your knees, hips, or shoulders force you to stop training, the downstream effects on muscle mass, cardiovascular health, and mental wellbeing are significant.
Green lipped mussel (GLM): Native to New Zealand, green lipped mussel contains a unique profile of omega-3 fatty acids (including ETA — eicosatetraenoic acid) that may offer more potent comfort-supporting benefits than standard fish oil. Research published in Marine Drugs has shown GLM extract can help support joint comfort and mobility.
Vitamin D3: Beyond its well-known role in bone health, vitamin D3 supports immune function, muscle strength, and inflammation regulation. New Zealand's latitude means many Kiwis have suboptimal vitamin D levels, especially during autumn and winter or if training primarily indoors.
L-Carnitine: This amino acid derivative supports energy metabolism and has shown supportive properties for joint tissue comfort. It also supports mitochondrial function — relevant as mitochondrial efficiency declines with age.
WIIP Joint Comfort combines all three — green lipped mussel extract, L-Carnitine, and Vitamin D3 — in a single daily supplement designed specifically for active adults who want to keep moving without compromise.
Best time to take: With a meal containing some fat (for vitamin D3 absorption).
Supplement #4: Vitamin D3 (If Not Getting Enough From Joint Support)
Why it matters after 40: Vitamin D deserves its own section because its importance after 40 extends far beyond joint health. It's a hormonal precursor that influences virtually every system in your body.
The New Zealand context:
- A Ministry of Health survey found that approximately 1 in 4 New Zealand adults have vitamin D levels below the recommended threshold
- During winter months (May–August), UV levels in much of New Zealand are insufficient for adequate vitamin D synthesis through skin exposure
- Darker skin, indoor lifestyles, and sunscreen use further reduce production
- After 40, the skin's ability to synthesise vitamin D from sunlight decreases
Key benefits:
- Bone health — vitamin D is essential for calcium absorption. Without adequate D3, you can consume plenty of calcium and still develop weak bones
- Muscle function — vitamin D receptors are present in skeletal muscle. Deficiency is associated with weakness, falls, and impaired recovery
- Immune regulation — vitamin D modulates both innate and adaptive immunity. This is particularly relevant as immune function naturally becomes less efficient with age
- Mood and mental health — vitamin D deficiency has been linked to low mood and seasonal affective patterns, both of which can increase after 40
- Metabolic health — adequate vitamin D levels are associated with better insulin sensitivity and contributes to normal metabolic function
Recommended dose: 1,000–2,000 IU daily for most adults over 40. If you're using WIIP Joint Comfort, check the vitamin D3 content and top up if needed to reach your daily target.
Get tested: A simple blood test can check your 25-hydroxyvitamin D levels. Optimal is 75–100 nmol/L.
Supplement #5: Omega-3 Fatty Acids
Why it matters after 40: Chronic low-grade inflammation — sometimes called "inflammaging" — is one of the hallmarks of ageing. It's a persistent, low-level state that contributes to reduced joint flexibility, cardiovascular concerns, cognitive wellness challenges, and metabolic changes. Omega-3 fatty acids are among the most well-researched natural nutrients that support the body's natural comfort response.
Key benefits for the over-40 demographic:
- Heart health support — omega-3s support healthy triglyceride levels and arterial function, contributing to normal cardiovascular function
- Joint comfort — EPA and DHA help support the body's natural comfort pathways that contribute to joint mobility and comfort
- Cognitive support — DHA is a primary structural component of brain cell membranes. Adequate intake may support memory, focus, and processing speed
- Eye health — DHA is concentrated in the retina, and omega-3 supplementation may support eye health as you age
- Recovery from exercise — omega-3s help resolve exercise-induced inflammation more efficiently, reducing DOMS and supporting faster recovery between sessions
Sources: Fatty fish (salmon, mackerel, sardines), green lipped mussel extract, fish oil, or algal oil (vegan option). For the most comprehensive omega-3 profile, New Zealand green lipped mussel offers unique fatty acids not found in standard fish oil.
Recommended dose: 2–3 grams of combined EPA/DHA daily.
Putting It All Together: A Daily Supplement Routine for Over-40 Kiwis
Here's a practical daily schedule incorporating all five supplements:
Morning:
- WIIP NMN Boost — 500mg NMN on an empty stomach
- WIIP Joint Comfort — with breakfast (fat helps vitamin D3 and omega-3 absorption)
- Additional omega-3 if needed — with breakfast
Evening:
- WIIP Muscle Relax — 400mg magnesium glycinate, 1–2 hours before bed
- Additional vitamin D3 if your morning dose doesn't reach 1,000–2,000 IU
This routine covers cellular energy (NMN), muscle function and sleep (magnesium), joint health (GLM + vitamin D3), and inflammation management (omega-3s) — the five pillars that active adults over 40 benefit from most.
For value, the WIIP Bundle ($201.60, saving 10%) includes Joint Comfort, Muscle Relax, and NMN Boost — covering three of the five categories in one convenient package.
Lifestyle Foundations That Amplify Supplement Benefits
Supplements are powerful tools, but they work best when combined with solid lifestyle practices:
- Resistance training 2–3 times per week — this is the single most effective intervention against age-related muscle loss. Muscle is metabolically active tissue; losing it accelerates many aspects of ageing
- Prioritise sleep — aim for 7–8 hours. Sleep is when growth hormone peaks and cellular repair occurs. Magnesium supplementation can support this
- Eat enough protein — aim for at least 1.6g per kilogram of bodyweight daily. Protein needs actually increase with age as muscle protein synthesis becomes less efficient
- Stay active daily — beyond formal exercise, aim for 7,000–10,000 steps. Movement keeps joints lubricated and supports cardiovascular health
- Manage stress — chronic stress accelerates ageing through cortisol elevation, inflammation, and telomere shortening. Find sustainable stress management practices
- Stay social — loneliness and social isolation are significant health risk factors after 40. Community, connection, and purpose matter for longevity
When to Start
The best time to start supporting your body with targeted supplementation was ten years ago. The second-best time is now.
You don't need to overhaul everything at once. Start with the supplement that addresses your most pressing concern — whether that's energy (NMN), sleep and muscle recovery (magnesium), or joint comfort (GLM + vitamin D3) — and build from there.
The key is consistency. Supplements aren't magic pills; they're daily habits that compound over weeks and months. The active 60-year-old who started supplementing wisely at 40 is in a very different position from the one who didn't.
Frequently Asked Questions
What are the most important supplements for adults over 40?
The five most important supplements for active adults over 40 are NMN (for cellular energy and NAD+ support), magnesium glycinate (for muscle function, sleep, and recovery), a joint support complex containing green lipped mussel (for joint mobility and comfort), vitamin D3 (for bone health, immunity, and muscle function), and omega-3 fatty acids (for inflammation management and cardiovascular health). These address the key physiological changes that accelerate after 40.
Is NMN safe for long-term use?
Current evidence suggests NMN has a strong safety profile. Human clinical trials of up to 12 months at doses of 250–1,200mg daily have reported no significant adverse effects. NMN is a naturally occurring molecule in your body and in foods like broccoli, edamame, and avocado. However, long-term studies spanning multiple years are still ongoing, so it's wise to consult your healthcare provider before starting any new supplement, especially if you take medications.
Can I take all five supplements together?
Yes, these five supplements can be taken together as they address different biological pathways and don't compete for absorption. For optimal results, split them between morning (NMN, joint support, omega-3, vitamin D3 with a meal) and evening (magnesium glycinate before bed). This timing aligns with your body's circadian rhythms and maximises absorption of each nutrient.
How long before I notice benefits from these supplements?
Timelines vary by supplement. Magnesium can improve sleep quality within 1–2 weeks. NMN typically takes 2–4 weeks for noticeable energy improvements. Joint support supplements usually require 4–8 weeks for meaningful comfort changes, as cartilage and connective tissue respond slowly. Vitamin D levels take about 8–12 weeks to optimise if you're starting from deficiency. Consistency is more important than immediate results — these are long-term health investments.
Do I still need supplements if I eat a healthy diet?
A healthy diet is the foundation, but it may not be sufficient after 40 for several reasons. NMN is present in foods only in trace amounts (you'd need roughly 100kg of broccoli to get 250mg). Magnesium levels in New Zealand soil have declined, reducing the mineral content of produce. Vitamin D synthesis decreases with age and is limited during NZ winters. And therapeutic doses of omega-3s or green lipped mussel extract are difficult to achieve through food alone. Supplements fill specific gaps that diet and lifestyle can't always cover.
Supporting your body after 40 doesn't have to be complicated. The WIIP Bundle combines NMN Boost, Muscle Relax, and Joint Comfort — three essential supplements for active Kiwis — at 10% off. Shop at wiip.co.nz.
Sources & Further Reading
- Massudi H, et al. (2012). "Age-associated changes in oxidative stress and NAD+ metabolism in human tissue." PLoS ONE. PMC4112140 [VERIFIED]
- Yoshino M, et al. (2021). "Nicotinamide mononucleotide increases muscle insulin sensitivity in prediabetic women." Science. PubMed 33888596 [VERIFIED]
- Cruz-Jentoft AJ, et al. (2019). "Sarcopenia: revised European consensus on definition and diagnosis." Age Ageing. PMC6322506 [VERIFIED]
- Abshirini M, et al. (2021). "Green-lipped mussel efficacy in knee osteoarthritis: A systematic review and meta-analysis of randomized controlled trials." Int J Food Sci Nutr. PMC8298224 [VERIFIED]
- Holick MF. (2017). "The vitamin D deficiency pandemic: Approaches for diagnosis, treatment and prevention." Rev Endocr Metab Disord. PubMed 28516265 [VERIFIED]
- Calder PC. (2017). "Omega-3 fatty acids and inflammatory processes: from molecules to man." Biochem Soc Trans. PubMed 28900017 [VERIFIED]
Disclaimer: This article is for informational purposes only and does not constitute medical advice. Dietary supplements are not medicines and are not intended to diagnose, treat, cure, or prevent any disease. Always consult a qualified healthcare professional before starting any supplement regimen.