The best supplements for men over 40 in New Zealand
For men over 40, four supplements have the strongest published evidence: Magnesium Glycinate (sleep, recovery, low Mg correlates with low testosterone), Green Lipped Mussel (joint impact from training and manual work), Vitamin D3 (NZ winter deficiency; D3 supports testosterone), and NMN (mitochondrial energy + sarcopenia prevention). Training quality, joint comfort, and energy are the bottlenecks WIIP supplements target.
Four-pillar protocol
| Concern after 40 | Why it matters | WIIP solution |
|---|---|---|
| Sleep + recovery + cramps | Mg loss in sweat. Sleep quality is the #1 lever for testosterone, recovery, and training. | Muscle Relax+ (400mg elemental Mg, evening) |
| Joint impact load | Training, manual work, and recreational sport accumulate. GLM reduces post-exercise inflammation. | Joint Comfort+ (1,000mg GLM + 200mg L-Carnitine + 800 IU D3) |
| Energy + sarcopenia | NAD+ falls 1–2%/yr after 30. Muscle mass loss starts mid-30s. Both accelerate without action. | NMN Boost+ (500mg NMN, morning) |
| Vitamin D3 + testosterone | Low D3 correlates with low T. Auckland winters give insufficient UV synthesis April–September. | Joint Comfort+ includes 800 IU D3 per serve |
Clinical evidence (men-relevant)
- Igarashi 2022 12 weeks NMN supplementation in older men improved muscle strength and walking speed. PMID 35487864.
- Cinar 2011 magnesium supplementation correlated with testosterone in trained men. PMID 20352370.
- Sintzel 2021 GLM systematic review for joint inflammation. PMID 32379482.
- Pilz 2011 Vitamin D and testosterone in men — supplementation increased serum T. PMID 21154195.
NZ practitioner protocol (men 40+, no contraindications)
- Daily evening (1–2 hrs before bed): Muscle Relax+ 2 caps — sleep is the bigger lever for testosterone than most supplements.
- Daily morning: Joint Comfort+ 2 caps with breakfast.
- Daily morning (optional): NMN Boost+ 2 caps if training 4+ times/wk, manual job, or fatigue is a primary concern.
- The WIIP Bundle covers all three with 10% off — the simplest stack for active men 40+.
What this protocol does NOT replace
- Testosterone replacement therapy (TRT) — supplements are not a substitute for medical TRT if clinically indicated. See your GP for blood work.
- Protein intake — aim 1.6–2.0g/kg body weight per day from whole foods first.
- Cardio + resistance training — the supplement stack supports training, not replaces it.
- Zinc — if dietary zinc is low (rare with regular red meat / shellfish), supplement separately.
Related guides
- Post-workout recovery NZ
- Supplements for runners NZ
- Best magnesium for sleep NZ
- Supplements for women over 40 NZ
References
- Igarashi M, et al. Chronic NMN supplementation in older men. NPJ Aging. 2022. PMID 35487864.
- Cinar V, et al. Magnesium supplementation and serum testosterone. Biol Trace Elem Res. 2011. PMID 20352370.
- Sintzel MB, et al. GLM systematic review. Crit Rev Food Sci Nutr. 2021. PMID 32379482.
- Pilz S, et al. Effect of vitamin D supplementation on testosterone levels in men. Horm Metab Res. 2011. PMID 21154195.
Editorial standards: this page is formulated and reviewed by AWC-registered practitioners. Information is educational, not personal medical advice. See our Medical Review Board for editorial process.