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Types of L-Arginine: Forms & Bioavailability

Evidence:Moderate
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This content is for informational purposes only and does not constitute medical advice. Statements about dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary — consult your healthcare provider before starting any supplement. Full disclaimer

Forms Comparison

FormBioavailabilityBest For
L-Arginine HClModerateGeneral supplementation; most common and affordable form
L-Arginine Alpha-Ketoglutarate (AAKG)ModeratePre-workout and exercise performance applications
Sustained-Release L-ArginineModerate-HighCardiovascular support with steadier plasma levels

L-Arginine HCl

Bioavailability: Moderate. Best for: General supplementation; most common and affordable form.

L-Arginine Alpha-Ketoglutarate (AAKG)

Bioavailability: Moderate. Best for: Pre-workout and exercise performance applications.

Sustained-Release L-Arginine

Bioavailability: Moderate-High. Best for: Cardiovascular support with steadier plasma levels.

Full L-Arginine Guide

References

  1. Meta-analysisDong JY, Qin LQ, Zhang Z, et al. (2011). Effect of oral L-arginine supplementation on blood pressure: a meta-analysis of randomized, double-blind, placebo-controlled trials. American Heart Journal. DOI PubMed
  2. Meta-analysisRhim HC, Kim MS, Park YJ, et al. (2019). The Potential Role of Arginine Supplements on Erectile Dysfunction: A Systemic Review and Meta-Analysis. Journal of Sexual Medicine. DOI PubMed
  3. RCTSchwedhelm E, Maas R, Freese R, et al. (2008). Pharmacokinetic and pharmacodynamic properties of oral L-citrulline and L-arginine. British Journal of Clinical Pharmacology. DOI PubMed
  4. Tian Y, Zhou Q, Li W, Liu M, et al. (2023). Efficacy of L-arginine and Pycnogenol ® in the treatment of male erectile dysfunction: a systematic review and meta-analysis.. Frontiers in endocrinology. DOI PubMed
  5. Karimi E, Hatami E, Ghavami A, Hadi A, et al. (2023). Effects of L-arginine supplementation on biomarkers of glycemic control: a systematic review and meta-analysis of randomised clinical trials.. Archives of physiology and biochemistry. DOI PubMed
  6. Porto AA, Gonzaga LA, Benjamim CJR, Valenti VE (2023). Absence of Effects of L-Arginine and L-Citrulline on Inflammatory Biomarkers and Oxidative Stress in Response to Physical Exercise: A Systematic Review with Meta-Analysis.. Nutrients. DOI PubMed
  7. Meta-analysisShiraseb F, Asbaghi O, Bagheri R, Wong A, et al. (2022). Effect of l-Arginine Supplementation on Blood Pressure in Adults: A Systematic Review and Dose-Response Meta-analysis of Randomized Clinical Trials.. Advances in nutrition (Bethesda, Md.). DOI PubMed
Show 3 more references
  1. Meta-analysisd'Unienville NMA, Blake HT, Coates AM, Hill AM, et al. (2021). Effect of food sources of nitrate, polyphenols, L-arginine and L-citrulline on endurance exercise performance: a systematic review and meta-analysis of randomised controlled trials.. Journal of the International Society of Sports Nutrition. DOI PubMed
  2. Goto E (2021). Effects of prenatal oral L-arginine on birth outcomes: a meta-analysis.. Scientific reports. DOI PubMed
  3. Gui S, Jia J, Niu X, Bai Y, et al. (2022). l-arginine supplementation improved neonatal outcomes in pregnancies with hypertensive disorders: a systematic review.. The Journal of nutritional biochemistry. DOI PubMed