⏳ Longevity & healthspan
6 mechanistic pathways · 74 options
Nothing here is proven to extend human lifespan, because that trial takes a lifetime and nobody has run it. What exists is a set of well-characterized ageing mechanisms and compounds that move them in animals. That is a real basis for reasoning and a bad basis for certainty — and the honest version of this page says both. One thing worth noting: the interventions with actual human mortality data are the boring ones — blood pressure, ApoB, glucose control, muscle mass. They are on this page too.
The pathways
Nutrient sensing — mTOR, AMPK & caloric restriction mimetics
The most conserved longevity mechanism across every species tested. Persistent nutrient abundance signals growth; scarcity signals repair and maintenance. Everything in this pathway is a way of telling the cell that food is scarce when it isn't.
NAD+ & sirtuin signaling
NAD+ falls by roughly half between young adulthood and old age. It is the obligate cofactor for the sirtuins that regulate DNA repair, mitochondrial biogenesis and inflammation. The precursors reliably raise the pool — the honest gap is what that buys you clinically.
Cellular senescence & senolytics
Senescent cells stop dividing but refuse to die, and they secrete an inflammatory cocktail — the SASP — that drives ageing in neighboring tissue. Transplanting senescent cells into young mice causes age-related dysfunction; clearing them reverses it. The mechanism is unusually well demonstrated. The human dosing is guesswork.
Autophagy & mitochondrial quality control
Damaged proteins and mitochondria accumulate because clearance slows with age. Autophagy is the recycling program; mitophagy is the mitochondria-specific arm. This is arguably the most tractable longevity mechanism because fasting alone moves it.
Glycation, oxidation & protein damage
Sugars cross-link proteins into advanced glycation end-products that stiffen arteries, cloud lenses and toughen collagen. It is one of the few ageing mechanisms you can see and touch, and glucose control is the upstream lever.
The unglamorous evidence — what actually has mortality data
Worth being blunt. Nothing above has human lifespan data. These do — ApoB, blood pressure, glucose and muscle mass are the four variables with the strongest causal evidence for how long you live, and they are less interesting than senolytics precisely because they're settled.
Test before you choose a pathway
Every route below can be argued for on mechanism. Only bloodwork tells you which one is actually your problem — and picking the wrong pathway is the most common reason someone concludes "none of this works". Across all 6 pathways, these are the 18 markers worth having in front of you first.
Ordered together:
⏳ Longevity Baseline🔥 Inflammation Deep Dive🏆 Total Health Panel — ComprehensiveWhat actually decides this outcome, in order of size
Longevity is the one goal on this site where the outcome cannot be observed in time to act on it, which is why the reasoning has to be unusually careful. Ranked by how much of the outcome each one owns:
- Cardiorespiratory fitness, which has the largest human effect size of anything on this hub. Fitness measured on a treadmill test was associated with long-term mortality in a large clinical cohort Harb 2021, and international consensus recommendations for exercise in older adults have been written specifically around healthy longevity Izquierdo 2024. It is not purchasable, it is measurable, and no compound below it has an equivalent.
- Which denominator a claim was measured against, because most longevity claims quietly change it. Lifespan in a mouse colony, diabetes incidence in a prevention trial, a cohort association, a change in a cell-culture marker and a change in a biological age estimate are five different endpoints. Every pathway under this hub is strong on one of them and silent on the others.
- Whether the evidence is a trial or an association, because on this goal the two disagree often. Multivitamin use was examined against mortality in three prospective cohorts Loftfield 2024 and separately randomized against cancer and cardiovascular outcomes Sesso 2022. Spermidine intake has a prospective cohort association Kiechl 2018 and no randomized mortality endpoint.
- Whether an intervention has ever been tested in the species you belong to. Rapamycin's founding result is a mouse lifespan study Harrison 2009 and the same program has produced sex-specific results and outright nulls for compounds sold widely as longevity agents Harrison 2021. Metformin's human file is diabetes prevention and its mortality analysis Lee 2021, not lifespan.
- Competing risk, which decides where an individual should spend. The thing most likely to end a given reader's life is usually already visible on a routine panel. Somebody with an apolipoprotein B in the top decile and untreated hypertension gains more from those two numbers than from every pathway on this hub combined.
The order to run these in, and what has to be true first
Measure the risks that are already present, take the free intervention with the largest effect, and treat the six pathways below as a portfolio you choose ONE item from rather than a checklist.
- One panel, and read it as competing risk rather than as a score. ApoB (Apolipoprotein B) and Lipoprotein(a) — Lp(a), HbA1c (Hemoglobin A1c), hs-CRP (High-Sensitivity C-Reactive Protein), Comprehensive Metabolic Panel (CMP) with Cystatin C with eGFR for renal function, Complete Blood Count (CBC) with Differential and Vitamin D (25-Hydroxy). Blood pressure at home. This set names the specific things most likely to shorten a specific life.
- Get a fitness number and improve it, because it is the intervention with the mortality association and no product attached. A treadmill or a submaximal field test gives a baseline Harb 2021, and the consensus recommendations describe what to do with it Izquierdo 2024. This step is the highest-value action available from this hub.
- Then choose exactly one pathway for one year. Nutrient sensing is Nutrient sensing — mTOR, AMPK & caloric restriction mimetics. NAD and sirtuins is NAD+ & sirtuin signaling, where the starting point should be that nicotinamide riboside did not extend mouse lifespan Harrison 2021. Senescent cell clearance is Cellular senescence & senolytics. Autophagy is Autophagy & mitochondrial quality control. Cross-linking is Glycation, oxidation & protein damage.
- Read the mortality page before spending anything. The unglamorous evidence — what actually has mortality data is where the human endpoints live, and a reader who starts there buys differently from one who starts at a mechanism.
- Healthy Aging / Longevity Stack and Greens Powder are the bundled version and inherit the bundle problem. The multivitamin evidence is the closest analog and it is mixed in both directions Sesso 2022 Loftfield 2024. The argument about fixed blends is at Ready-made stacks by goal.
- Metformin and Rapamycin are prescriptions and belong to a physician, not to a hub page. One has a human outcome file in a specific disease population Lee 2021; the other has a mouse lifespan result and a monitoring requirement Harrison 2009.
- Spermidine and Green Tea (EGCG) are the dietary end and are where a cautious reader starts. Higher spermidine intake tracks lower mortality in a prospective cohort Kiechl 2018, which is the strongest thing that can honestly be said about a food-derived polyamine.
- Write down what would make you stop. On a goal whose endpoint arrives in forty years, the only discipline available is a pre-committed review date and a marker that has to move by it. Without that, a longevity protocol is a subscription.
What gets bought for this that cannot move it
The category that fails structurally is anything sold against a biological age estimate. These calculators are trained to predict mortality from cohort data; they were not validated as responsive endpoints, and no intervention on this hub has been shown to change one and thereby change an outcome. A number that moves when you change your answers is a model output, not a measurement of you.
Cohort associations are the commonest evidence on this hub and the easiest to misread. People with higher spermidine intake eat differently in a hundred other ways Kiechl 2018; people who take multivitamins differ from people who do not, which is exactly why the cohort analysis and the randomized trial of multivitamins point in different directions Loftfield 2024 Sesso 2022. That divergence is the most instructive thing on the page.
And the biggest lever is the one nobody sells. A fitness improvement of one metabolic equivalent is associated with a difference in long-term mortality that no supplement on this site has demonstrated Harb 2021, and the exercise consensus exists because the intervention is specific and prescribable Izquierdo 2024. A reader spending four figures a year on this hub while their fitness declines has the arithmetic backwards.
If the goal underneath is nearer than lifespan, say so. Wanting to feel less tired is Energy & fatigue. Wanting to keep muscle into old age is Build muscle & strength, and mTOR suppression works against it. Wanting to protect memory is Focus, memory & cognition. Wanting a lower cardiovascular risk specifically is ApoB & LDL particle reduction, which is the most tractable version of this goal for most readers.
How you would know it was working, on a real read-out and a real timescale
This hub makes a prediction that is deliberately about the next year rather than the next forty. If a longevity protocol is worth continuing, the near-term risk markers should improve or stay optimal while fitness rises. If ApoB (Apolipoprotein B) is drifting up and fitness is drifting down, nothing in the protocol is compensating and the protocol has failed on the only timescale you can observe.
- ApoB (Apolipoprotein B) with Lipoprotein(a) — Lp(a) once and ApoB (Apolipoprotein B) annually. Apolipoprotein B counts atherogenic particles rather than cholesterol mass; lipoprotein(a) is largely genetically determined and is a once-in-a-lifetime measurement that changes how aggressively everything else is treated.
- HbA1c (Hemoglobin A1c) and hs-CRP (High-Sensitivity C-Reactive Protein) annually. These are the two cheapest integrators of metabolic and inflammatory exposure, and they are the markers a nutrient-sensing intervention would be expected to move if it were doing anything Lee 2021.
- Cystatin C with eGFR with the Comprehensive Metabolic Panel (CMP), because renal function is the silent constraint. It is not derived from muscle mass, which makes it the better filtration estimate in anybody lifting or taking creatine, and declining filtration changes what is safe from every pathway on this hub.
- A repeated fitness test, annually, same protocol. This is the primary read-out of the hub because it is the variable with the mortality association Harb 2021 and the one the consensus recommendations are written to change Izquierdo 2024.
- 12 months between reviews, and the number has a reason. Nothing on this hub has a mechanism that would show a real effect in less time, and a shorter loop guarantees that seasonal and behavioral noise will be read as signal.
What will fool you. Everybody starting a longevity protocol also starts sleeping, training and eating differently, and those move every marker here. A biological age estimate falls when you enter a better resting heart rate, which is a fact about the calculator. Animal lifespan results are frequently sex-specific Harrison 2021, so the headline you read may not have been about somebody like you. And a cohort association Kiechl 2018 will always look more encouraging than the randomized trial that follows it Sesso 2022, which is the pattern this whole hub is built on.
Sources read for these sections
- Harb SC. Associations between cardiorespiratory fitness, sex and long term mortality amongst adults undergoing exercise treadmill testing. International Journal of Cardiology 2021 · PMID 34363868
- Izquierdo M. Global consensus on optimal exercise recommendations for enhancing healthy longevity in older adults (ICFSR). Journal of Nutrition Health and Aging 2024 · PMID 39743381
- Harrison DE. Rapamycin fed late in life extends lifespan in genetically heterogeneous mice. Nature 2009 · PMID 19587680
- Harrison DE. 17-a-estradiol late in life extends lifespan in aging UM-HET3 male mice; nicotinamide riboside and three other drugs do not affect lifespan in either sex. Aging Cell 2021 · PMID 33788371
- Loftfield E. Multivitamin Use and Mortality Risk in 3 Prospective US Cohorts. JAMA Netw Open 2024 · PMID 38922615
- Lee CG. Effect of Metformin and Lifestyle Interventions on Mortality in the Diabetes Prevention Program and Diabetes Prevention Program Outcomes Study. Diabetes Care 2021 · PMID 34697033
- Kiechl S, et al. Higher spermidine intake is linked to lower mortality: a prospective population-based study.. American Journal of Clinical Nutrition 2018 · PMID 29955838
- Sesso HD. Multivitamins in the prevention of cancer and cardiovascular disease: the COcoa Supplement and Multivitamin Outcomes Study (COSMOS) randomized clinical trial. Am J Clin Nutr 2022 · PMID 35294969
You have the pathways. Here is the stack.
The Longevity Blueprint names the one compound I would start with in each of these 6 pathways, what it was chosen over, and why — plus 21 options to swap in or stack on top, every one of them priced and linked.
Open The Longevity Blueprint →You know the goal. Skool has the plan.
Every pathway above is one arm of The Longevity & healthspan Blueprint. The members' version has the sequence they run in, what stacks with what, and the markers that tell you to keep going or stop — alongside the Bloodwork Protocols.
Open The Longevity & healthspan Blueprint in Skool →$10/mo, cancel anytime.
← Open Longevity & healthspan in the interactive Vault · All 21 goals
Frequently asked questions
This goal is broken into 6 distinct mechanistic pathways — Nutrient sensing — mTOR, AMPK & caloric restriction mimetics; NAD+ & sirtuin signaling; Cellular senescence & senolytics; Autophagy & mitochondrial quality control and others — across 74 compounds and supplements. Each pathway is a different argument about how the body gets there, so the useful question is which one matches where you are actually stuck.
The one that matches your actual limitation, which bloodwork usually settles faster than guessing. An appetite drug does nothing for someone who already undereats, and a thyroid intervention does nothing if your thyroid is fine. Each pathway page lists the markers that tell you whether it is your problem.
No. The 6 pathways are listed in mechanistic order, not by strength of evidence, and neither are the 74 options inside them. A lot of what works in this space has never had the trial run, and sorting by trial count would bury exactly the compounds you came looking for.
Where this goes next
Everything above is the free case for Longevity & healthspan. The protocol — the dosing, the order to correct things in, the week-by-week schedule and what to retest — is a lesson inside Skool.