L-Arginine
Performance
Also known as: L-Arginine, AAKG, L-Arginine (Wound Healing), Arginine
B
Grade B💊 3-6g🎯 6 primary uses🔗 2 synergies⚠️ Review warnings
Levels upFitness+50 pts
Overview
Direct nitric oxide precursor. Less effective orally than citrulline but still used.
Primary Uses
PumpBlood flowNitric oxideWound healingCollagen synthesisSurgery recovery
Frequently Asked About L-Arginine
How much L-Arginine should I take?
The typical effective range is 3-6g. Individual needs vary based on age, body weight, diet, and goals — start at the lower end and adjust based on response. Always consult a healthcare provider before starting a new supplement.
When is the best time to take L-Arginine?
Pre-workout. Consistency matters more than perfect timing — pick a daily anchor (e.g. with breakfast or before bed) and stick with it.
Should I take L-Arginine with food?
Either.
Does L-Arginine interact with medications?
Yes — known interactions include Blood pressure meds and Viagra/Cialis. If you take any prescription medication, talk to your doctor or pharmacist before starting L-Arginine.
What does L-Arginine pair well with?
L-Arginine stacks well with Citrulline and Pycnogenol — these combinations either improve absorption or work synergistically toward common goals.
Who should not take L-Arginine?
L-Arginine should be avoided or used with caution by people with Post heart attack and Herpes (may reactivate). Pregnant or breastfeeding women should consult a healthcare provider before use.
What are the side effects of L-Arginine?
Most people tolerate L-Arginine well. The most commonly reported side effects are GI upset and Diarrhea. Side effects are usually dose-dependent — lowering the dose often resolves them.
Dosage
Typical range
3-6g
Timing
Pre-workout
With food
Either
Duration
Acute effects
Special Populations
Those who respond to arginine
Research & Studies
Search the literature now
We haven’t curated landmark studies for L-Arginineyet — one-click into the primary literature here. PubMed (RCTs) is usually the highest-signal starting point.
Mechanism of Action
- • Direct NO precursor
- • Poor oral bioavailability
- • Arginase breaks it down
Evidence Quality
Evidence Grade B
Supports healing via NO and collagen
Safety & Contraindications
Serious Warnings
- • May affect herpes outbreaks
Contraindications
- • Post heart attack
- • Herpes (may reactivate)
Common Side Effects
- • GI upset
- • Diarrhea
Pregnancy & Breastfeeding
Consult healthcare provider
Liver & Kidney Notes
No concerns
Interactions
💊 Medications
- • Blood pressure meds
- • Viagra/Cialis
🧪 Supplements
- • Citrulline (same pathway)
🍽️ Food & Alcohol
- • No interactions
Stacking & Synergies
Pairs Well With
Avoid Combining With
Best Goal Synergies
Blood flow
Buying Guide
What to Look For
- • AAKG for better absorption
Standardization Markers
L-Arginine form
Adulteration risk
Low
Practical Notes
- • Citrulline is superior for NO
- • Still has uses
- • May trigger herpes outbreaks
- • Important for surgical healing
Tags
pumpnitric oxideblood flowvasodilationamino acidwoundcollagenNO
Top Products with L-Arginine
Highest-scored catalog products containing L-Arginine, ranked by our scoring engine.
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More in Performance
Other ingredients in the Performance category.
Agmatine Sulfate
Arginine metabolite with nitric oxide and pain-modulating effects. Enhances pumps.
Arachidonic Acid (ARA)
Omega-6 fatty acid that amplifies exercise-induced muscle signaling. Increases training response but also inflammation.
BCAAs
A branched-chain amino acid blend in a 2:1:1 leucine-to-isoleucine-to-valine ratio, formulated in instantized (micronized) form for improved solubility. BCAAs support muscle protein synthesis and may reduce exercise-induced fatigue, though whole protein sources provide comparable benefits at lower cost.
Beetroot / Nitrates
Dietary nitrates converted to nitric oxide for improved endurance and blood flow. Can enhance exercise efficiency.
Beta-Alanine
Increases muscle carnosine for buffering acid during high-intensity exercise. Delays fatigue in 1-4 minute efforts.
Beta-Hydroxybutyrate (BHB)
Exogenous ketone body that can elevate blood ketone levels. Used for energy, cognitive function, and supporting ketogenic diets.
Last reviewed: September 2026 by the Formulate Research Team. Sources cited above; methodology and scoring criteria published here.
Cite this page
Formulate Research Team. (2026, September). L-Arginine — Evidence-Based Supplement Guide. Formulate Supplement Encyclopedia. https://app.formulate-health.app/learning/supplements/arginine
Educational content based on published research and our scoring methodology. Not medical advice — consult a qualified healthcare provider before starting, stopping, or changing supplements, especially if you take medications, are pregnant, or have a medical condition.