9 Best Supplements for Longevity and Brain Health

By Domenic Pisanelli, BHSc Naturopathy | ATMS Registered | Vital Health & Natural Medicine, Melbourne | Reviewed for clinical accuracy — July 2026

The supplement market is worth billions precisely because most of what's in it is poorly evidenced, cleverly marketed, and completely unnecessary for most people. That makes the question of what's actually worth spending money on — especially when budgets are limited — a genuinely important clinical question.

After 25 years in practice, this is my answer. Not a protocol for a specific condition. Not a stack designed for an elite biohacker with unlimited spending. Nine supplements with a robust, reproducible, clinically meaningful evidence base — across longevity, brain health, mitochondrial function, cardiovascular protection, and inflammation control. The kind of evidence that should change what you do, not just confirm a theoretical mechanism.

Each one below is verified. Where the claims are strong, I'll tell you why. Where the evidence has limits — including where emerging mechanisms haven't yet translated into robust human outcome data — I'll flag that too. The evidence strength varies across this list, and that distinction matters.

Strong evidence — cardiovascular outcomes, specific populations

The Omega-3 Index — EPA and DHA as a percentage of red blood cell fatty acids — is one of the most clinically actionable cardiovascular biomarkers available. The evidence here is not preliminary. A systematic review and meta-analysis of ten prospective cohort studies involving over 310,000 participants found an inverse association between circulating EPA+DHA levels and sudden cardiac death, with high versus low levels associated with a hazard ratio of approximately 0.55 for CVD mortality.

Reference: Yoo et al. (2024) — Omega-3 fatty acids and sudden cardiac death: systematic review and meta-analysis, PubMed

The original work by Harris and von Schacky established the Omega-3 Index framework: below 4% is high cardiovascular risk, 4–8% intermediate, above 8% low risk. In Seattle, the risk for sudden cardiac death with a low percentage of EPA+DHA in red cell membranes was tenfold the risk found with a high percentage — a finding mirrored in the Physicians Health Study.

Reference: von Schacky (2012) — Omega-3 Index and sudden cardiac death, PMC

The average Australian has an Omega-3 Index of approximately 4–5%. Most people supplementing with the standard 1g fish oil capsule are not moving that number meaningfully. Getting above 8% consistently requires either significant dietary oily fish intake or 2–4 grams of high-quality EPA+DHA daily, ideally confirmed with a home Omega-3 Index test. Quality matters — seek molecularly distilled, third-party tested for heavy metals and oxidation (TOTOX value below 26).

Strong evidence when deficient — immune regulation, bone, emerging ageing data

Vitamin D is not really a vitamin — it is a secosteroid hormone with receptors in virtually every tissue in the body. The vitamin D receptor (VDR) binds hundreds of genomic loci and modulates the expression of a large number of primary target genes involved in immune regulation, cell proliferation, and anti-inflammatory signalling. Deficiency is effectively a hormonal deficiency with wide-ranging downstream consequences.

The most clinically significant recent finding is the relationship between vitamin D supplementation and epigenetic ageing. A longitudinal study of 1,036 older adults in the Berlin Ageing Study II found that epigenetic age acceleration was on average 2.6 years lower in vitamin D-deficient participants who were successfully supplemented, compared to vitamin D-deficient participants without supplementation. This is not a trivial finding — it means correcting deficiency may meaningfully slow biological ageing at the cellular level.

Reference: Kresovich et al. (2022) — Vitamin D supplementation and slower epigenetic ageing, GeroScience

An earlier RCT of 4,000 IU/day Vitamin D3 over 16 weeks demonstrated a decrease in DNA methylation age of approximately 1.85 years in vitamin D-deficient participants. These findings are preliminary and require replication in larger trials, but the direction of evidence is consistent across multiple studies.

K2 (as MK-7) is paired with D3 for good reason: high-dose D3 increases calcium absorption and mobilisation. Without adequate K2, that calcium may deposit in arterial walls rather than bone. K2 activates matrix Gla protein (MGP), which inhibits arterial calcification — a mechanism with direct cardiovascular relevance. The combination is more clinically complete than D3 alone.

In Australian practice: deficiency below 50 nmol/L is extremely common, and optimal range for immune and hormonal function is generally considered 75–150 nmol/L. Vitamin D is also routinely included as part of a comprehensive functional health assessment — testing before supplementing removes the guesswork entirely. Dose should be guided by measured 25-OH-D rather than assumed.

Strong evidence — sleep, dysmenorrhoea, insulin sensitivity, DNA repair cofactor

Magnesium is a cofactor in over 300 enzymatic reactions including ATP synthesis, DNA repair, protein synthesis, and muscle and nerve function. It is one of the most clinically significant and consistently depleted nutrients in the modern diet — largely because magnesium content in food has declined substantially with soil depletion, and because chronic stress, alcohol, and certain medications (particularly PPIs and diuretics) actively deplete it.

The clinical applications with strongest evidence include sleep quality, dysmenorrhoea, migraine prevention, insulin sensitivity, and blood pressure. For sleep specifically: magnesium regulates GABA receptors and reduces cortisol reactivity, producing measurable improvements in sleep onset and quality in deficient individuals. Magnesium deficiency is also one of the contributing factors in chronic fatigue presentations in women — particularly where HPA axis dysregulation is a driver. It also supports the production of melatonin through its role in serotonin metabolism.

For longevity specifically, the DNA repair role matters most. Magnesium is required for the activity of DNA polymerases and repair enzymes. Suboptimal magnesium status impairs the body's ability to repair DNA damage — a mechanism that may contribute to long-term cellular health, including DNA integrity — though direct causal links to cancer risk in humans are more complex and require appropriate clinical context.

Strong evidence in older adults — 3 large RCTs for cognitive outcomes

Multivitamins have historically had a weak evidence base for clinical outcomes. That changed substantially with the COSMOS trial programme — a randomised placebo-controlled study involving over 21,000 US adults aged 60 and older, producing three separate cognitive ancillary studies.

The COSMOS-Mind study found that daily multivitamin-mineral supplementation for three years improved global cognition, episodic memory, and executive function in older adults. The COSMOS-Web study extended this, finding that the effect of the multivitamin intervention improved memory performance above placebo by the equivalent of 3.1 years of age-related memory change.

Reference: Vyas et al. (2023) — Multivitamin supplementation improves memory in older adults: RCT, PMC

A subsequent meta-analysis pooling all three COSMOS cognitive studies confirmed the benefit on global cognitive function and episodic memory. This is now three large RCTs showing consistent directional effect — not observational data.

The mechanism is likely multifactorial: micronutrient repletion corrects subclinical deficiencies in B vitamins, zinc, and other cofactors essential for neurotransmitter synthesis, myelin maintenance, and one-carbon metabolism. The benefit appears largest in individuals who are nutrient-depleted at baseline — which describes a substantial proportion of adults over 60 eating a standard Western diet.

Quality caveat: the COSMOS studies used Centrum Silver. Practitioners typically prefer activated, methylated B vitamins (methylfolate, methylcobalamin, P5P) over synthetic folic acid and cyanocobalamin — particularly for individuals with MTHFR variants. A food-based or practitioner-grade formulation is worth the difference in cost.

Emerging evidence — strong mechanistic data; human prevention trials ongoing

Sulforaphane is an isothiocyanate compound produced when glucoraphanin in cruciferous vegetables — particularly broccoli sprouts — is hydrolysed by the enzyme myrosinase. Its primary mechanism of action is NRF2 activation.

NRF2 is the master regulator of the cellular antioxidant response — controlling the expression of over 200 genes involved in antioxidant defence, detoxification, anti-inflammation, and cellular repair. Under normal conditions, NRF2 is held inactive in the cytoplasm. Sulforaphane releases it, allowing it to translocate to the nucleus and upregulate glutathione synthesis, heme oxygenase-1, NAD(P)H quinone oxidoreductase, and multiple phase 2 detoxification enzymes simultaneously. This is a more efficient approach than supplementing individual antioxidants one at a time.

The clinical applications with the most developed evidence include cancer risk reduction (sulforaphane has Phase 2 trial data for prostate cancer, breast cancer, and colorectal cancer — results are promising but human prevention trials remain ongoing), autism symptom reduction, air pollution detoxification, and type 2 diabetes. Research from Johns Hopkins — where sulforaphane was first characterised — continues to be the reference point for much of this evidence base.

Strong evidence — muscle performance; growing cognitive evidence in older adults

Creatine is one of the most extensively studied supplements in existence, with over 500 peer-reviewed publications across athletic performance, muscle preservation, bone health, and increasingly, brain health. It is safe, inexpensive, and dramatically under-utilised outside of gym culture.

The mechanism: creatine is stored in muscle and brain tissue as phosphocreatine, acting as a rapid ATP buffer during high-energy demand. In muscle, this translates to increased strength, power, and muscle mass. In the brain — which accounts for approximately 20% of the body's energy consumption — it supports neuronal energy availability, particularly under conditions of metabolic stress, sleep deprivation, or ageing-related mitochondrial decline.

For brain health, meta-analyses demonstrate that creatine supplementation improves working memory and processing speed — with the largest effects seen in older adults, vegetarians, and vegans (who have lower baseline muscle and brain creatine stores from dietary absence). At doses around 20g per day short-term or 5g per day long-term, creatine also reduces markers of brain damage after traumatic brain injury and may have neuroprotective effects in early neurodegenerative conditions.

10g per day is cited as the threshold for meaningful cognitive benefit in research settings — higher than the 3–5g typically used for athletic performance. For individuals primarily interested in brain effects rather than muscle performance, dosing accordingly matters.

Creatine monohydrate — the original, most studied form — is the only form worth purchasing. "Buffered," "ethyl ester," and other proprietary variants add cost and offer no demonstrated superiority.

Emerging evidence for longevity — strong for statin support and cardiac conditions

Coenzyme Q10 is a fat-soluble quinone essential to the mitochondrial electron transport chain — the process by which cells convert nutrients into ATP. It exists in two forms: ubiquinone (the oxidised form) and ubiquinol (the reduced, active form). Most cheap CoQ10 supplements are ubiquinone, which requires enzymatic conversion to ubiquinol before it can be used. This conversion efficiency declines significantly with age — making ubiquinol the clinically preferable form in adults over 40.

CoQ10 production by the body peaks in the mid-20s and declines approximately 50% by age 70. Statins — taken by a large proportion of adults over 50 for cardiovascular risk — directly inhibit the mevalonate pathway that produces CoQ10 endogenously, often producing the muscle pain and fatigue commonly attributed to statin intolerance. Ubiquinol supplementation is a standard clinical intervention in this context.

For longevity specifically, the mitochondrial connection matters. Mitochondrial dysfunction is increasingly understood as a central mechanism in neurodegenerative disease — Parkinson's, Alzheimer's, and ALS all show mitochondrial involvement. CoQ10 in its reduced form supports electron transport efficiency, reduces mitochondrial oxidative stress, and maintains membrane potential in neurones. This is not a cure for neurodegeneration; it is a modifiable factor in a system that loses efficiency predictably with age.

Emerging evidence for longevity — strong for joint pain, metabolic syndrome

Curcumin is the primary bioactive polyphenol in turmeric root. Its anti-inflammatory mechanism is well-characterised: it inhibits NF-κB — the master inflammatory transcription factor — and suppresses COX-2 activity, reducing prostaglandin production. Crucially, it is one of the few naturally occurring compounds with demonstrated ability to reduce TNF-alpha, a pro-inflammatory cytokine directly implicated in the chronic, low-grade inflammation that drives accelerated ageing across multiple systems.

The problem with curcumin is bioavailability. Standard curcumin extract is poorly absorbed from the gastrointestinal tract — estimated oral bioavailability is less than 1%. Research on curcumin's effects is largely based on enhanced delivery formulations. Phytosomal curcumin (curcumin complexed with phosphatidylcholine) and liposomal curcumin both dramatically improve absorption. Piperine (black pepper extract) at 20mg increases absorption of standard curcumin by approximately 2,000% through CYP3A4 inhibition — an effective and cheaper alternative, though piperine has its own drug interaction considerations.

Clinical applications with meaningful evidence include osteoarthritis (comparable to ibuprofen for pain scores in several RCTs), metabolic syndrome, depression as an adjunct therapy, non-alcoholic fatty liver disease, and inflammatory bowel conditions. For healthy adults, the primary longevity rationale is suppression of chronic systemic inflammation — the background inflammatory state that accelerates atherosclerosis, neurodegeneration, and metabolic disease simultaneously.

Emerging evidence — promising early human trial data; longer-term studies needed

Urolithin A is a gut-derived metabolite produced when gut bacteria break down ellagitannins from pomegranates, walnuts, and certain berries. The problem is that only approximately 30–40% of people have the gut microbiome profile to produce meaningful amounts — making dietary intake alone an unreliable strategy for most individuals.

Its primary mechanism is mitophagy — the selective cellular recycling of damaged mitochondria. As mitochondria age and accumulate damage, mitophagy is one of the body's primary quality-control mechanisms. When it declines, damaged mitochondria accumulate, driving cellular energy decline, increased oxidative stress, and accelerated ageing. Urolithin A is one of the first dietary compounds to demonstrate measurable effects on mitophagy-related pathways in human studies — a distinction from most longevity compounds that have primarily shown effects in animal models.

The clinical evidence, while still early, is promising. A randomised controlled trial published in Nature Aging (2022) found that Urolithin A supplementation at 1g per day improved muscle strength (handgrip) and aerobic endurance in older adults compared to placebo over four months. Muscle mitochondrial gene expression improved on muscle biopsy. A subsequent study found reductions in inflammatory markers.

This is genuinely novel territory. The compound is expensive, the evidence base is smaller than everything else on this list, and long-term data are limited. But the mechanism is sound, the early human trial data is positive, and mitophagy decline is a real and significant contributor to the ageing phenotype. It sits at the frontier of longevity supplementation in a way most supplements claim to but don't.

Before You Build Your Stack — Test Your Baseline

Nutritional status varies considerably between individuals. Someone reading this article with an Omega-3 Index already above 8% needs a different approach to someone at 3.5%. The same applies to vitamin D, magnesium, zinc, and every other marker on this list. The evidence for each supplement above assumes deficiency or suboptimal status — if you're already replete, the marginal benefit is smaller.

This is where targeted testing changes the conversation from a generic protocol to a personalised one.

Bonus: Nicotinamide Riboside (NR)

NR is a precursor to NAD+ — a coenzyme central to cellular energy metabolism, DNA repair, and sirtuins (proteins involved in longevity signalling). NAD+ declines approximately 50% between age 40 and 70. NMN (nicotinamide mononucleotide) is the more direct precursor and arguably better absorbed, though the research on oral bioavailability of both continues to evolve.

The evidence in humans is more mixed than in animal models — a common pattern in longevity research. Human trials have confirmed that NR increases NAD+ levels in blood. Whether that translates to the tissue-level effects seen in mice is still being established. The mechanistic rationale is strong. The human clinical outcome data is still maturing. It warrants monitoring rather than confident recommendation at this stage — hence its position as a "worth experimenting with" addendum rather than core list entry.

At a Glance — The Full Stack

The Framework Behind This List

Every supplement on this list was selected on the same basis: a plausible mechanism, human trial data (not just animal models), reproducible findings across multiple studies, and a benefit-to-risk profile that makes sense for a generally healthy adult. None of them is appropriate for every person in every clinical context.

The other thing worth naming: supplements work best on top of a foundation that actually supports them. Omega-3 is more bioavailable from fish than from a capsule consumed alongside a pro-inflammatory diet. Vitamin D supplementation is less effective without magnesium, which is required for vitamin D metabolism. Creatine works differently depending on baseline dietary intake. The stack doesn't operate in isolation from how you eat, sleep, and manage stress.

And critically — knowing which of these is most relevant to you requires knowing what your baseline looks like. An Omega-3 Index of 3.5% is a different situation from 7.2%. A 25-OH-D of 28 nmol/L requires a different D3 dose than 58 nmol/L. Treating supplementation as a generic protocol rather than a personalised intervention is one of the most common and most expensive mistakes in this space.

Frequently Asked Questions