Every intervention Outliyr has scored for vo2 max, ranked by its BioHarmony score for this use case rather than its overall rating. The number beside each name is how well that one thing works for vo2 max; the tier beside it is what it is worth once safety, cost and effort are counted across everything else.
25 of 68 evaluated interventions score 3.0+ out of 10 for vo2 max · 2 comparisons
The Norwegian 4x4 protocol scores 9.0/10 for the vo2-max use case, based on a 7% improvement reported in Helgerud 2007. The Norwegian 4x4 approach consists of four minutes of near-maximal effort repeated…
Read the Norwegian 4×4 report →Sprint interval training scores 8.5/10 for VO2max because short all-out efforts raise maximal oxygen uptake nearly as well as far longer endurance training. Gist 2014 pooled 16 trials and found a weighted…
Read the Sprinting (Sprint Interval Training) report →For vo2-max, Zone 2 Cardio lands at 7.5/10 because Vabishchevich 2026 supports the strongest part of the claim. The existing rationale points to this narrower claim: this verified source found each 1-MET…
Read the Zone 2 Cardio report →The evidence-weighted call is 6.0/10 for Blood-Flow Restriction Training in vo2 max, led by Centner et al. 2019. Zhang 2025 found endurance-athlete BFR improved aerobic capacity and performance versus similar training without…
Read the Blood-Flow Restriction Training report →Tirzepatide may improve functional exercise capacity in obesity related HFpEF. Reduced body mass can improve relative aerobic performance. It does not directly train cardiorespiratory fitness. Lean mass loss can blunt performance. Score…
Read the Tirzepatide report →VO2 max scores 5.5. Rucking is a moderate continuous aerobic stimulus, and that style of training raises VO2 max by roughly 3.5 to 4.9 mL/kg/min on average across the literature (Crowley 2022),…
Read the Rucking (Weighted Walking) report →VO2-max scores 5.5/10 because relative oxygen uptake can improve when body weight falls, while absolute aerobic power may decline if training and lean mass decline. Wilding 2021 supports the body-mass side of…
Read the Semaglutide report →The evidence does not support a meaningful VO2-max boost from Whole-Body Vibration, with meta-analyses of athlete trials showing no significant change in aerobic capacity (Peng et al. 2024). Whole-Body Vibration receives a…
Read the Whole-Body Vibration report →Ca-AKG (Calcium Alpha-Ketoglutarate) earns 5.0/10 for vo2-max because Demidenko 2021 is the cleanest verified anchor for this report. The existing rationale points to this narrower claim: No direct VO2 max data. Keep…
Read the Ca-AKG (Calcium Alpha-Ketoglutarate) report →The evidence for SLU-PP-332 improving vo2-max scores is limited, with no human cardiopulmonary data reported in the study Billon et al. 2023. SLU-PP-332 showed enhanced treadmill endurance in mice, but the endpoint…
Read the SLU-PP-332 report →Hadanny 2022 supports physical performance gains in middle-aged athletes after hard-chamber protocols. VO2 max specifically is not established enough to score high across users. Healthy endurance athletes should not expect HBOT to…
Read the Hyperbaric Oxygen Therapy report →No direct VO2 max evidence was verified. EAAs are not a primary aerobic-capacity intervention.
Read the Essential Amino Acids report →No direct VO2max trial was identified. Tongkat Ali may support training quality in specific responders, but it is not an aerobic-capacity intervention.
Read the Tongkat Ali report →VO2max may improve indirectly if anemia, motivation, muscle mass, or training consistency improves, but direct TRT effects on aerobic capacity are not a primary evidence strength. Cardiometabolic basics still dominate.
Read the TRT (Testosterone Replacement Therapy) report →INSUFFICIENT_EVIDENCE for VO2 max improvement; exercise-stacking evidence currently argues against an upside assumption.
Read the Rapamycin report →Plasma volume and hydration status support cardiac output during endurance work; the effect is maintenance under stress, not a direct VO2 max builder.
Read the Electrolytes report →Fat-oxidation and exercise-efficiency signals may help endurance, but VO2 max itself is not well established as a primary astaxanthin endpoint.
Read the Astaxanthin report →VO2-relevant exercise-capacity gains appear in heart-failure patients, but healthy-athlete VO2max trials are mixed, so this is conditional on a compromised baseline.
Read the Coenzyme Q10 (CoQ10 / Ubiquinol) report →Konopka 2019 reported smaller aerobic-fitness gains with metformin during 12 weeks of training in older adults. This is one of the clearest negative biohacker-relevant signals.
Read the Metformin report →Davis 2010 reported VO2max gains in trained subjects on quercetin. Later RCTs in athletes were mixed, with Scholten 2013 and Bigelman 2010 both null on performance. The Kressler 2011 meta-analysis showed roughly…
Read the Quercetin report →No evidence exogenous ketones raise VO2 max. The performance meta-analysis (Brooks 2022) found no aerobic-capacity benefit, and one trial showed impairment.
Read the Exogenous Ketones report →The single clean single-ingredient RCT (Chen 2010) found no VO2 max change; the positive VO2 max result (Hirsch 2017) was a blend, so VO2 max specifically is not established for cordyceps.
Read the Adaptogenic Mushrooms (Reishi, Cordyceps, Chaga) report →WB-EMS has high perceived intensity but does not reliably deliver the sustained aerobic workload needed to raise VO2max. It should complement, not replace, aerobic conditioning.
Read the Full-Body EMS report →VO2max evidence remains inconsistent and endpoint-fragile. Omega-3 is not a dependable aerobic capacity intervention.
Read the Omega-3 report →Nothing matches those filters.
Head-to-head reports and category rankings that name a winner on this use case.
Metformin scores 6.9 and rapamycin 6.8, which settles nothing. Rapamycin owns the aging-biology rows: longevity 8.0, autophagy 8.5, senescence 7.8, plus replicated mouse lifespan data. Metformin owns everyday…
Norwegian 4x4 scores 8.5 and Zone 2 cardio 8.3, so the 0.2 gap decides nothing. Your weekly hours decide it. Pick 4x4 when you have under two hours…
Norwegian 4×4, at 9.0 out of 10 for vo2 max. The Norwegian 4x4 protocol scores 9.0/10 for the vo2-max use case, based on a 7% improvement reported in Helgerud 2007.
Of the top-scoring options, Glycine is the least expensive at about $2 a month, scoring 4.5 out of 10 for vo2 max.
25 of the 68 interventions evaluated for vo2 max score 3.0 out of 10 or better, which is the cut-off for appearing on this page.
