L-Arginine / AAKG
Also sold as: L-arginine · Arginine alpha-ketoglutarate · AAKG
An amino acid used to make nitric oxide. Marketed for exercise pump and erectile function, with markedly different evidence and safety across populations.
Energy Longevity
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Research
- Energy: Endurance benefit is not consistently demonstrated; a single positive chronic AAKG trial conflicts with acute null studies.
- Longevity: No general longevity evidence; a post-heart-attack trial raised a mortality safety signal.
REALITY CHECK // Blood-pressure and mild-to-moderate erectile dysfunction trials show benefit, but neither proves a gym pump or longer life. One chronic AAKG trial improved strength while acute trials were negative; arginine after acute myocardial infarction carries a serious safety warning.
Levels: how we grade evidence. Grey = evidence of no benefit; amber = evidence it makes this goal worse.
Ratings are self-reported by a self-selected group of users: how it felt, not proof that it works.
Check your bottle
Compare what your label says with what was used in trials. This is a trial range, not a personal prescription.
Enter the amount from your label to see the result.
How it was studied
UPPER LIMIT // The dossier supplies no established EFSA/NIH UL. Gastrointestinal intolerance becomes more prominent above approximately 9 g/day; absence of a UL does not establish safety.
Summary
Blood-pressure and mild-to-moderate erectile dysfunction trials show benefit, but neither proves a gym pump or longer life. One chronic AAKG trial improved strength while acute trials were negative; arginine after acute myocardial infarction carries a serious safety warning.
Mechanism
Arginine is a nitric-oxide synthase substrate. Intestinal and hepatic arginase limit oral exposure; higher blood arginine does not necessarily improve functional blood flow or exercise performance.
Typical studied dose
Erectile dysfunction studies used 1.5-5 g/day; blood-pressure analyses found a systolic signal from at least 4 g/day, without additional benefit above 9 g/day. One AAKG study used 12 g/day for 8 weeks; these are trial descriptions, not a personal regimen.
Upper limit
The dossier supplies no established EFSA/NIH UL. Gastrointestinal intolerance becomes more prominent above approximately 9 g/day; absence of a UL does not establish safety.
Popular stacks with L-Arginine / AAKG
Not enough stack data yet. A combination with L-Arginine / AAKG appears here once 5 people rate the same set.
Forms and label traps
| Form on label | Active content | Studied range / day | Absorption & GI tolerance | Verdict |
|---|---|---|---|---|
| L-Arginine free base Best for: Label comparison against the preparation actually studied. |
100% elemental / active | 1500–5000 mg | Substantial intestinal/hepatic first-pass metabolism. Dose-related diarrhea, nausea and bloating, especially above 9 g/day. |
Studied standard [REFERENCE // LABEL_BASIS] Input is free-arginine mass. The displayed 1.5-5 g range concerns erectile-dysfunction trials, not proven exercise efficacy. |
| L-Arginine hydrochloride (~83% arginine) Best for: Label comparison against the preparation actually studied. |
83% elemental / active | 1500–5000 mg | No clear functional advantage over free base. Tolerance depends on the amount and individual sensitivity. |
Caution [CAUTION // CHECK_FORM] 5000 mg of this salt supplies approximately 4150 mg arginine by the supplied stoichiometric estimate. |
| Arginine alpha-ketoglutarate (AAKG) Best for: Label comparison against the preparation actually studied. |
Extract weight · ~100% marker | 12000–12000 mg | Raises blood arginine; superior exercise blood flow is unproven. Tolerance depends on the amount and individual sensitivity. |
Caution [CAUTION // CHECK_FORM] Compare AAKG compound mass only. Arginine fraction depends on salt ratio; 100% here denotes total AAKG input, not pure arginine content. |
Common label traps
- TRAP_01 // AAKG guarantees a workout pump
A trial increased circulating arginine but blood-flow and NO-metabolite increases were attributed to exercise itself, without a placebo advantage. - TRAP_02 // Oral arginine raises growth hormone and builds muscle
Intravenous diagnostic responses do not establish oral anabolic effects; oral arginine before resistance exercise suppressed its GH response in an RCT. - TRAP_03 // More bioavailable means more muscle
AAKG has no established functional advantage, and neither transient hormone changes nor plasma concentrations prove hypertrophy.
Other outcomes studied
Outside the five leaderboard goals. Same evidence levels as above.
- BLOOD PRESSURE Moderate · benefit
A 22-RCT dose-response analysis reported systolic -6.40 mmHg (95% CI -8.74 to -4.05) and diastolic -2.64 mmHg (95% CI -3.94 to -1.40) in adults; this is not advice to replace medication.
PMID 34967840 PMID 22137067 - ERECTILE FUNCTION Moderate · benefit
Ten RCTs (540 men with mild/moderate dysfunction) reported improvement OR 3.37 (95% CI 1.29-8.77), without improved desire. Combination evidence cannot isolate arginine; new ED needs cardiovascular assessment.
PMID 30770070 PMID 33587304 PMID 37908749 - AAKG STRENGTH Limited · benefit
One 8-week study in 35 trained men at 12 g/day improved bench 1RM and Wingate peak power without body-composition or aerobic benefit; two acute trials were negative.
PMID 16928472 PMID 22510253 PMID 21399536 - WORKOUT BLOOD FLOW Limited · no benefit
Increased plasma arginine did not establish an additional exercise blood-flow advantage.
PMID 21813912 - ENDOTHELIAL MARKERS Limited · benefit
Some markers improved in cardiovascular/metabolic patients, with substantial heterogeneity; not transferable to healthy athletes.
PMID 30577559 - GROWTH HORMONE Limited · no benefit
Oral pre-exercise arginine suppressed the exercise GH response; intravenous stimulation is a different clinical setting.
PMID 24225560 PMID 36467462 - PREGNANCY CLINICAL NUTRITION Limited · benefit
Reviews suggest a preeclampsia-related signal, sometimes using combinations. This is obstetric care, never a self-treatment protocol.
PMID 39800868 PMID 24172291 PMID 23435582 PMID 22957482 - SURGICAL IMMUNONUTRITION Moderate · benefit
Arginine-containing enteral formulas reduced complications in surgical/oncology populations. Other nutrients and clinical care prevent attribution to an OTC arginine capsule.
PMID 24844870 PMID 20631383 PMID 40732929 - POST-MI SAFETY Moderate · makes it worse
VINTAGE MI recorded 6 deaths (8.6%) versus none on placebo over 6 months and was stopped for safety; a pooled 2-RCT analysis did not show mortality benefit (RR 0.93, 95% CI 0.74-1.17). Avoid after acute MI.
PMID 16391217 PMID 19938054
Reader questions
What amount was studied for erectile dysfunction?
Trials used 1.5-5 g/day in mild/moderate dysfunction, sometimes with other ingredients. That cannot determine a safe personal amount or replace evaluation of possible vascular disease.
Is everyday use safe long term?
No formal UL or convincing lifelong safety evidence is supplied. The post-MI signal means safety depends strongly on medical history.
Is citrulline better than arginine?
Citrulline bypasses much intestinal/hepatic arginase metabolism and can raise blood arginine more efficiently. That pharmacokinetic advantage does not guarantee a performance or erectile outcome.
Can it reactivate herpes or shingles?
The dossier contains mechanistic reasoning and user reports, rather than controlled evidence proving reactivation. Discuss recurrent infections with a clinician.
Stack interactions
- Danger Blood-pressure drugs, medicinal nitrates and PDE5 inhibitors [DANGER // CLINICAL_REVIEW]
Potential additive hypotension; blood-pressure efficacy data support caution but are not a direct trial of every combination.
PMID 34967840 - Caution Anticoagulants and antiplatelet drugs [CAUTION // REVIEW_COMBINATION]
A theoretical vascular/platelet interaction, not a demonstrated clinical interaction in this dossier. - Caution Diabetes medicines [CAUTION // REVIEW_COMBINATION]
Glucose changes in the AAKG study motivate monitoring; combination hypoglycemia is a precaution.
PMID 16928472 - Caution Citrulline and lysine [CAUTION // REVIEW_COMBINATION]
Citrulline can raise circulating arginine through renal conversion; this does not prove extra muscle growth. Lysine/herpes concerns remain mechanistic or anecdotal.
Red flags: interactions and who should avoid it
Interactions
Blood-pressure drugs, medicinal nitrates and PDE5 inhibitors: Potential additive hypotension; blood-pressure efficacy data support caution but are not a direct trial of every combination. Anticoagulants and antiplatelet drugs: A theoretical vascular/platelet interaction, not a demonstrated clinical interaction in this dossier. Diabetes medicines: Glucose changes in the AAKG study motivate monitoring; combination hypoglycemia is a precaution. Citrulline and lysine: Citrulline can raise circulating arginine through renal conversion; this does not prove extra muscle growth. Lysine/herpes concerns remain mechanistic or anecdotal.
Avoid or ask a doctor first if
Avoid after acute myocardial infarction or with unstable coronary disease. Low blood pressure, asthma, recurrent herpes, pregnancy/lactation and use in children need clinical review. Herpes reactivation is a mechanistic/anecdotal precaution, not a proven clinical effect. Diarrhea, nausea, bloating or faintness warrant stopping and assessment.
Sources (PubMed, 21)
- L-arginine therapy in acute myocardial infarction: the Vascular Interaction With Age in Myocardial Infarction (VINTAGE MI) randomized clinical trial.
PMID 16391217 · 2006 · Journal Article; Randomized Controlled Trial; Research Support; N.I.H.; ExtramuralVINTAGE MI recorded 6 deaths (8.6%) versus none on placebo over 6 months and was stopped for safety; a pooled 2-RCT analysis did not show mortality benefit (RR 0.93, 95% CI 0.74-1.17). Avoid after acute MI.
- Pharmacokinetics, safety, and effects on exercise performance of L-arginine alpha-ketoglutarate in trained adult men.
PMID 16928472 · 2006 · Journal Article; Randomized Controlled Trial; Research Support; Non-U.S. Gov'tOne 8-week study in 35 trained men at 12 g/day improved bench 1RM and Wingate peak power without body-composition or aerobic benefit; two acute trials were negative.
- Oral L-arginine supplementation in acute myocardial infarction therapy: a meta-analysis of randomized controlled trials.
PMID 19938054 · 2009 · Journal Article; Meta-Analysis; Research Support; Non-U.S. Gov'tVINTAGE MI recorded 6 deaths (8.6%) versus none on placebo over 6 months and was stopped for safety; a pooled 2-RCT analysis did not show mortality benefit (RR 0.93, 95% CI 0.74-1.17). Avoid after acute MI.
- Immunonutrition in high-risk surgical patients: a systematic review and analysis of the literature.
PMID 20631383 · 2010 · Journal Article; Meta-Analysis; Systematic ReviewArginine-containing enteral formulas reduced complications in surgical/oncology populations. Other nutrients and clinical care prevent attribution to an OTC arginine capsule.
- Acute arginine supplementation fails to improve muscle endurance or affect blood pressure responses to resistance training.
PMID 21399536 · 2011 · Journal Article; Randomized Controlled TrialOne 8-week study in 35 trained men at 12 g/day improved bench 1RM and Wingate peak power without body-composition or aerobic benefit; two acute trials were negative.
- Effects of 7 days of arginine-alpha-ketoglutarate supplementation on blood flow, plasma L-arginine, nitric oxide metabolites, and asymmetric dimethyl arginine after resistance exercise.
PMID 21813912 · 2011 · Journal Article; Randomized Controlled Trial; Research Support; Non-U.S. Gov'tIncreased plasma arginine did not establish an additional exercise blood-flow advantage.
- Effect of oral L-arginine supplementation on blood pressure: a meta-analysis of randomized, double-blind, placebo-controlled trials.
PMID 22137067 · 2011 · Journal Article; Meta-Analysis; ReviewA 22-RCT dose-response analysis reported systolic -6.40 mmHg (95% CI -8.74 to -4.05) and diastolic -2.64 mmHg (95% CI -3.94 to -1.40) in adults; this is not advice to replace medication.
- Acute L-arginine alpha ketoglutarate supplementation fails to improve muscular performance in resistance trained and untrained men.
PMID 22510253 · 2012 · Journal ArticleOne 8-week study in 35 trained men at 12 g/day improved bench 1RM and Wingate peak power without body-composition or aerobic benefit; two acute trials were negative.
- Effect of L-arginine supplementation on blood pressure in pregnant women: a meta-analysis of placebo-controlled trials.
PMID 22957482 · 2013 · Journal Article; Meta-AnalysisReviews suggest a preeclampsia-related signal, sometimes using combinations. This is obstetric care, never a self-treatment protocol.
- Arginine supplementation for improving maternal and neonatal outcomes in hypertensive disorder of pregnancy: a systematic review.
PMID 23435582 · 2014 · Journal Article; Meta-Analysis; Research Support; Non-U.S. Gov't; Systematic ReviewReviews suggest a preeclampsia-related signal, sometimes using combinations. This is obstetric care, never a self-treatment protocol.
- The role of L-arginine in the prevention and treatment of pre-eclampsia: a systematic review of randomised trials.
PMID 24172291 · 2014 · Journal Article; Meta-Analysis; Systematic ReviewReviews suggest a preeclampsia-related signal, sometimes using combinations. This is obstetric care, never a self-treatment protocol.
- Oral L-arginine before resistance exercise blunts growth hormone in strength trained males.
PMID 24225560 · 2014 · Journal Article; Randomized Controlled Trial; Research Support; Non-U.S. Gov'tOral pre-exercise arginine suppressed the exercise GH response; intravenous stimulation is a different clinical setting.
- Efficacy of arginine-enriched enteral formulas in the reduction of surgical complications in head and neck cancer: a systematic review and meta-analysis.
PMID 24844870 · 2014 · Journal Article; Meta-Analysis; Systematic ReviewArginine-containing enteral formulas reduced complications in surgical/oncology populations. Other nutrients and clinical care prevent attribution to an OTC arginine capsule.
- Association of l-Arginine Supplementation with Markers of Endothelial Function in Patients with Cardiovascular or Metabolic Disorders: A Systematic Review and Meta-Analysis.
PMID 30577559 · 2018 · Journal Article; Meta-Analysis; Systematic ReviewSome markers improved in cardiovascular/metabolic patients, with substantial heterogeneity; not transferable to healthy athletes.
- The Potential Role of Arginine Supplements on Erectile Dysfunction: A Systemic Review and Meta-Analysis.
PMID 30770070 · 2019 · Journal Article; Meta-Analysis; Systematic ReviewTen RCTs (540 men with mild/moderate dysfunction) reported improvement OR 3.37 (95% CI 1.29-8.77), without improved desire. Combination evidence cannot isolate arginine; new ED needs cardiovascular assessment.
- Comparison of efficacy and safety of daily oral L-arginine and PDE5Is alone or combination in treating erectile dysfunction: A systematic review and meta-analysis of randomised controlled trials.
PMID 33587304 · 2021 · Journal Article; Meta-Analysis; Systematic ReviewTen RCTs (540 men with mild/moderate dysfunction) reported improvement OR 3.37 (95% CI 1.29-8.77), without improved desire. Combination evidence cannot isolate arginine; new ED needs cardiovascular assessment.
- Effect of l-Arginine Supplementation on Blood Pressure in Adults: A Systematic Review and Dose-Response Meta-analysis of Randomized Clinical Trials.
PMID 34967840 · 2022 · Journal Article; Meta-Analysis; Systematic Review; Research Support; Non-U.S. Gov'tA 22-RCT dose-response analysis reported systolic -6.40 mmHg (95% CI -8.74 to -4.05) and diastolic -2.64 mmHg (95% CI -3.94 to -1.40) in adults; this is not advice to replace medication.
- Growth Hormone Response to L-Arginine Alone and Combined with Different Doses of Growth Hormone-Releasing Hormone: A Systematic Review and Meta-Analysis.
PMID 36467462 · 2022 · Journal Article; ReviewOral pre-exercise arginine suppressed the exercise GH response; intravenous stimulation is a different clinical setting.
- Efficacy of L-arginine and Pycnogenol ® in the treatment of male erectile dysfunction: a systematic review and meta-analysis.
PMID 37908749 · 2023 · Meta-Analysis; Systematic Review; Research Support; Non-U.S. Gov't; Journal ArticleTen RCTs (540 men with mild/moderate dysfunction) reported improvement OR 3.37 (95% CI 1.29-8.77), without improved desire. Combination evidence cannot isolate arginine; new ED needs cardiovascular assessment.
- L-Arginine and L-Citrulline for Prevention and Treatment of Pre-Eclampsia: A Systematic Review and Meta-Analysis.
PMID 39800868 · 2025 · Journal Article; Systematic Review; Meta-AnalysisReviews suggest a preeclampsia-related signal, sometimes using combinations. This is obstetric care, never a self-treatment protocol.
- Perioperative Immunonutrition in Gastrointestinal Oncology: A Comprehensive Umbrella Review and Meta-Analysis on Behalf of TROGSS-The Robotic Global Surgical Society.
PMID 40732929 · 2025 · Journal Article; Meta-Analysis; Systematic ReviewArginine-containing enteral formulas reduced complications in surgical/oncology populations. Other nutrients and clinical care prevent attribution to an OTC arginine capsule.
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