L-Arginine
Also known as: Arginine, 2-amino-5-guanidinopentanoic acid
Effective Dosage
3-6 g daily
✓ What the Science Says
L-Arginine is an amino acid that serves as a precursor to nitric oxide, which can help improve blood flow and may enhance exercise performance. It has been shown in multiple systematic reviews and clinical trials to have potential benefits for cardiovascular health and exercise capacity.
✗ What It Doesn't Do
L-Arginine is often marketed as a miracle supplement for muscle gain or fat loss, but there is no strong evidence to support these claims. It does not replace the need for a balanced diet and proper training.
Evidence-Based Benefits
L-Arginine is an amino acid that serves as a precursor to nitric oxide, which can help improve blood flow and may enhance exercise performance. It has been shown in multiple systematic reviews and clinical trials to have potential benefits for cardiovascular health and exercise capacity.
Strong EvidenceEffective at: 3-6 g daily
Source: auto-research
Absorption & Bioavailability
Moderate - L-Arginine is absorbed well but can be affected by factors such as the presence of other amino acids.
Red Flags to Watch For
- 🚩 Products claiming to be 'instant muscle builders' with L-Arginine
- 🚩 High doses marketed without scientific backing
Research Sources
- PubMed
- NIH DSLD
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-02-05