The foundations
Sleep, diet, movement, stress, light and connection. Without them, no supplement can make up the difference.
Vāhana · Supplementation & Functional Optimization guide
A supplement isn't a shortcut,
it's a precision investment.
Seven rules and a map of longevity molecules to know what really works, and where to put your money.
The essential idea
There's no magic pill. First the foundations, then what's missing, then optimization.
What the research shows
The best-proven supplement for the brain isn't the most expensive.
The global longevity supplement market exceeds 9 billion dollars a year, and the star formulas promise to “target the 12 hallmarks of aging.” Yet in human trials, it's often the simplest molecules that keep their promises.
The surprising fact
2 yearsless cognitive aging with a simple daily multivitamin, according to a meta-analysis of the COSMOS trial covering more than 5,000 people aged 60 and over.
A modest effect in older adults. For preventing heart disease or cancer, the evidence remains weak: a multivitamin mainly fills gaps.Free access
The rest of the guide is waiting for you.
The optimization pyramid, when to get lab work, how to know you're absorbing, the molecule map ranked by merit, 90-ingredient formulas, peptides and injections.
The optimization pyramid
You don't put the roof on before the foundations.
Correct what's missing
What your lab results show: vitamin D, B12, iron, omega-3, magnesium. This is where a supplement acts most clearly.
Optimize, then experiment
One goal at a time, measured before and after. The experimental, only with a health professional.
The marker trap
NMN does raise NAD+. And then what?
A supplement can act at three levels: raising a blood marker, improving a function such as strength or memory, or changing real health. The first level is the easiest to reach, and the most sold. NMN does raise NAD+, a key molecule for cellular energy that falls with age. But a meta-analysis of 8 randomized trials found no significant benefit on blood sugar, insulin, HbA1c or cholesterol.
What this means for you: before you buy, ask yourself what level the promise sits at. A marker that rises isn't health that improves.
The seven rules
From foundations to optimization, in the right order.
Step 01 · Measure
Know where you're starting from
Optimization begins with a measurement, not a purchase.
01First of all
Get lab work, at the right time
Vitamin D, omega-3 index, ferritin, vitamin B12, HbA1c, fasting insulin, homocysteine and ApoB. The right time: before starting supplements, once a year from age 35 to 40, at major transitions (perimenopause, planning a pregnancy, a new medication, a plant-based diet), and 8 to 12 weeks after any change.
Try this
Ask your health professional for this panel and keep your results to compare. Our article on biomarkers of aging explains what to measure and why.
02At the start
Correct what's missing first
The best-proven supplements are also the cheapest: vitamin D3, omega-3, magnesium, B12, iron. Their effect is all the clearer when they correct a real deficiency.
Try this
Start with what your results and your diet show, not with what's trendy.
Step 02 · Target
A goal, then a molecule
Beyond deficiencies, each molecule serves a specific goal. The molecule map below ranks them by merit.
03Depending on your goal
Target one need at a time
Blood sugar, mitochondria, heart, brain, regeneration: each goal has its molecules, and their level of evidence varies enormously.
Try this
Choose the goal that matters most to you, then the best-proven molecule for it. One at a time, so you know what really works.
04When buying
Read the label like an expert
90-ingredient formulas often hide their doses in “proprietary blends,” sometimes well below the doses studied. And the form matters: magnesium oxide is very poorly absorbed, bisglycinate or citrate much better.
Try this
Insist on the dose of every ingredient, independent certification (NSF, USP) and, in Canada, a Natural Product Number (NPN). Then compare the dose with the one used in trials.
Step 03 · Secure and adjust
Optimize without harm
More isn't better, and a supplement is never neutral, whether next to a medication or next to another supplement.
05Always
Check what competes for absorption
Between supplements: calcium hinders iron absorption, and zinc taken long term can cause copper deficiency, with anemia and nerve damage. With medications: berberine adds to diabetes medications, vitamin K2 counteracts warfarin, and minerals interfere with some antibiotics and levothyroxine.
Try this
Keep iron two hours away from calcium, coffee and tea, and take it with vitamin C. Pair any long-term zinc with copper. Show your full list to your pharmacist.
06Every week
Pair it with movement
Supplements amplify the pillars, they don't replace them: creatine works with strength training, and high doses of antioxidants can even blunt the benefits of exercise.
Try this
Keep antioxidants at food-level doses around training, and bet on effort: it's what most reliably activates your mitochondria and the mobilization of your stem cells.
07Every 3 to 6 months
Measure again and sort
Repeating the panel shows what's really moving, and lets you stop what isn't helping.
Try this
Compare your lab results, energy, sleep and performance. Keep what works, stop the rest.
Expensive urine?
What counts is what you absorb.
It's partly true: beyond your needs, water-soluble vitamins (B and C) are excreted. Bright yellow urine after a B complex is simply excess vitamin B2 leaving. Fat-soluble vitamins (A, D, E, K) and minerals, on the other hand, aren't eliminated so easily: they can build up, even to excess.
How to know you're absorbing: measure blood levels before and after (vitamin D, B12, ferritin, omega-3 index); choose a well-absorbed form; take fat-soluble vitamins with a meal that contains fat; factor in your medications, since antacids reduce B12 and magnesium absorption; and watch a concrete function, such as energy, strength or sleep.
You are what you digest: a gut that absorbs poorly wastes even the best supplements. The Cellular Nutrition guide covers this.
The molecule map
Ranked by merit, according to human trials.
Worth it for most people. Vitamin D3 if your level is low, omega-3s if you eat little fatty fish, magnesium in a well-absorbed form, creatine with training (muscle, and memory according to a meta-analysis), fibre such as psyllium (cholesterol and blood sugar), and protein powder if your diet doesn't provide enough.
Useful to fill gaps. Multivitamin: especially after 60 or with a restricted diet. Choose one without iron if you're a man or a postmenopausal woman, unless a deficiency is measured.
Based on a measured need. B12 (after 50, plant-based diet, metformin or antacids); iron (low ferritin); berberine (blood sugar: an average 0.63% drop in HbA1c across 37 trials in people with diabetes); CoQ10 (heart failure: mortality fell from 18% to 10% in the Q-SYMBIO trial; statin use); methylated B vitamins (high homocysteine); lutein and zeaxanthin (existing macular degeneration, AREDS2 trial); ashwagandha and saffron (stress and mood, randomized trials); spirulina (cholesterol, modest effect); copper (alongside long-term zinc).
Promising, preliminary evidence. Urolithin A (Mitopure): better muscle endurance in 65- to 90-year-olds. Cocoa flavanols: fewer cardiovascular deaths in the COSMOS trial, without meeting its main goal. Astaxanthin and taurine: promising in animals. Regeneration: vahona (placebo-controlled pilot study), AFA algae (small study; choose a product tested for microcystins, algal toxins) and fucoxanthin.
Popular, little or no evidence. Collagen for skin: the effect disappears in independent, high-quality studies. NMN and NR: NAD+ rises, clinical benefits don't follow. Resveratrol: poor bioavailability. Spermidine: no effect on memory after 12 months in the SmartAge trial. Chlorella, PQQ and sea moss: thin data, and a highly variable iodine content for sea moss.
This ranking reflects the state of human trials in 2026; it will evolve with research.
All-in-one formulas
Paying for 90 ingredients, getting traces.
The most publicized all-in-one formulas list 80 to 100 ingredients and promise to replace a dozen or so supplements; some cost more than $2,000 a year. An independent analysis of a famous formula found “proprietary blends” with no dose per ingredient, averaging about 20 mg per ingredient in one of them, below the doses studied.
The opposite approach is gaining ground: measure first, then take only what your results justify.
Be wary of “satisfied participants” percentages: they are often self-reported impressions, not results measured against placebo.
When hype outpaces evidence
Methylene blue, peptides, parasite cleanses.
Methylene blue. No human data show that it slows aging. It's a MAO-A inhibitor: combined with some antidepressants, it can cause serious serotonin toxicity. Also avoid it during pregnancy.
Injectable peptides (BPC-157, TB-500, epitalon). None is an approved drug. In July 2026, an FDA advisory committee recommended, by narrow votes and against the advice of the agency's own scientists, allowing pharmacies to compound them by prescription: that's neither an approval nor proof of effectiveness. Products sold “for research” may be contaminated or wrongly dosed.
Parasite cleanses. They have no evidence in healthy people, and some herbs, such as wormwood at high doses, are toxic.
A real parasitic infection is diagnosed with a stool test and treated with a health professional.
Longevity medicine
Injections and prescriptions: what really exists.
GLP-1 agonists (semaglutide). In the SELECT trial, among more than 17,000 overweight people with cardiovascular disease, they reduced major cardiovascular events by about 20%. They are prescription drugs, with real side effects.
Metformin and rapamycin. Prescribed off-label by some longevity doctors; in healthy people, human evidence remains preliminary.
NAD+ infusions. Expensive, and without solid evidence of benefit.
These options belong with a doctor, who weighs benefits and risks for your situation.
Ancestral wisdom
Rasayana, the ancestor of targeted supplementation.
In Ayurveda, Rasayana is the science of rejuvenation: substances chosen according to constitution and stage of life, such as Shilajit, a Himalayan mineral resin, for which small human trials show effects on energy and male fertility. Chinese medicine likewise distinguishes its tonics by the energy they support: reishi for the spirit, ginseng for Qi. The same intuition as modern science: target rather than accumulate.
Tradition doesn't mean no interactions: tonic herbs and resins deserve the same caution as modern supplements, especially if you're on treatment. For Shilajit, insist on a purified product tested for heavy metals.
Your first foothold
Start with what your lab results show.
The right molecule isn't the most popular one: it's the one that meets a measured need.
Before you start
When to ask for advice?
Always before starting if you take an anticoagulant, an antidepressant, thyroid or diabetes medication, or an antibiotic, or if you are pregnant or breastfeeding. Report any unusual effect.
This guide is educational. It does not replace professional advice or treatment.
In short
Your 7 rules, at a glance.
- 01Lab work before, then 8 to 12 weeks after
- 02Correct deficiencies before optimizing
- 03One goal, one molecule at a time
- 04Clear doses, the right form, certification
- 05Separate, pair, show your pharmacist
- 06Supplements amplify, they don't replace
- 07Measure again, keep, stop
Key takeaway
Measure, target, measure again: that's optimization.
The market sells promises; science gives levels of evidence. Get the foundations right, correct what's missing, choose a goal, read the labels, and let your lab results decide what stays.
Explore the Longevity JournalSources and precautions
Multivitamin and cognition: Vyas C.M. et al., American Journal of Clinical Nutrition, 2024. Cocoa flavanols: Sesso H.D. et al., American Journal of Clinical Nutrition, 2022. NMN: Chen F. et al., Current Diabetes Reports, 2025. Urolithin A: Liu S. et al., JAMA Network Open, 2022. Berberine: meta-analysis of 37 trials, Frontiers in Pharmacology, 2022. CoQ10: Mortensen S.A. et al., JACC Heart Failure, 2014. Creatine and cognition: Xu C. et al., Frontiers in Nutrition, 2024. Collagen: meta-analysis of 23 trials, American Journal of Medicine, 2025. Zinc and copper: Duncan A. et al., Journal of Clinical Pathology, 2015. Spermidine: Schwarz C. et al., JAMA Network Open, 2022. GLP-1: Lincoff A.M. et al., New England Journal of Medicine, 2023. Antioxidants and exercise: Ristow M. et al., PNAS, 2009. Vahona: Drapeau C. et al., Journal of Stem Cell Research & Therapy, 2015. AFA: Jensen G.S. et al., Cardiovascular Revascularization Medicine, 2007. Market: The Business Research Company, 2026.
Educational content. This guide does not replace advice from a health professional or pharmacist.
