🏃 Endurance & work capacity
4 mechanistic pathways · 43 options
Endurance is limited by different things in different people — oxygen delivery, mitochondrial density, acid buffering, or fuel availability. This is the pathway where the exercise-mimetic compounds live, and where the rodent data is most spectacular and the human data most absent.
The pathways
Exercise mimetics & mitochondrial biogenesis
PGC-1α is the master regulator of mitochondrial biogenesis, and training is how you normally activate it. These compounds argue they can trigger the same transcriptional programme pharmacologically. It is the most exciting mechanism class in the Vault and the one furthest from a human trial.
Oxygen delivery & nitric oxide
You can only use the oxygen that arrives. Nitric-oxide-mediated vasodilation improves perfusion and — separately and more interestingly — reduces the oxygen cost of a given workload.
Buffering & fatigue resistance
High-intensity efforts end when hydrogen ions accumulate faster than you can buffer them. This pathway raises the buffer capacity, intracellularly and extracellularly. It is unglamorous, cheap and among the best-evidenced material in the entire Vault.
Substrate & fuel availability
Glycogen depletion is the classic wall. Metabolic flexibility — being able to run on fat when carbohydrate runs out — is what pushes it further away, and it is trainable and partly pharmacological.
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 4 pathways, these are the 13 markers worth having in front of you first.
Ordered together:
🏋️ Athletic Performance & Recovery🩸 Am I Iron Deficient?🍭 Metabolic Health & PrediabetesYou have the pathways. Here is the stack.
The Endurance Blueprint names the one compound I would start with in each of these 4 pathways, what it was chosen over, and why — plus 24 options to swap in or stack on top, every one of them priced and linked.
Open The Endurance Blueprint →The protocols behind these
Dosing, stacking and cycle timing live inside the Academy, alongside the full interactive Vault and the Bloodwork Protocols.
Join the Academy — $10/mo →← Open Endurance & work capacity in the interactive Vault · All 21 goals
Frequently asked questions
This goal is broken into 4 distinct mechanistic pathways — Exercise mimetics & mitochondrial biogenesis; Oxygen delivery & nitric oxide; Buffering & fatigue resistance; Substrate & fuel availability — across 43 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 4 pathways are listed in mechanistic order, not by strength of evidence, and neither are the 43 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.