Agmatine Sulfate
Also known as: Agmatine, 4-Aminobutyl Guanidine, Decarboxylated Arginine
A decarboxylated arginine metabolite that inhibits arginase (preserving arginine for NO production), modulates nNOS/iNOS selectively, and acts on imidazoline/NMDA receptors for neuromodulatory and analgesic effects.
Last reviewed: 2024-08-15 · 2 indexed studies
Set your location for accurate regulatory status
Saved on this device — no sign-in needed.
Overview
Agmatine Sulfate is a metabolite of L-arginine produced by decarboxylation via arginine decarboxylase (ADC). It functions as a neuromodulator and NO regulator with a unique mechanism — it inhibits the arginase enzyme that breaks down arginine, thereby extending the half-life of circulating arginine and prolonging NO-mediated vasodilation. It also acts on imidazoline, alpha-2 adrenergic, and NMDA receptors for neuroprotective and mood-regulating effects.
Mechanism & Function
White crystalline derivative of L-arginine. Bitter-metallic taste in solution.
- Powder
- Capsule
Capsule is generally preferred for bioavailability or efficacy.
Mechanism of Action
1) Arginase Inhibition: Blocks arginase enzyme that degrades arginine, preserving arginine pools for eNOS-mediated NO production. 2) Selective NOS Modulation: Inhibits inducible NOS (iNOS — pro-inflammatory) while supporting endothelial NOS (eNOS — vasodilatory), creating a favorable NO profile. 3) Neuromodulation: Agonist at imidazoline I1/I2 receptors, antagonist at NMDA receptors, and modulator of alpha-2 adrenergic receptors — conferring analgesic, anxiolytic, and neuroprotective properties. 4) Polyamine Modulation: Inhibits ornithine decarboxylase (ODC), regulating cellular proliferation pathways.
Physiological Role
Endogenous neuromodulator synthesized in the brain, liver, and kidneys. Functions as a neurotransmitter/neuromodulator independent of the classical NO pathway. Stored in synaptic vesicles and released in a calcium-dependent manner.
Primary Pathways
Performance / Health Relevance
Extends pump duration by preserving circulating arginine levels. The arginase inhibition mechanism is complementary to citrulline (which provides arginine) and Nitrosigine (which delivers sustained arginine). Additional neuromodulatory benefits may improve mind-muscle connection and training focus.
Evidence Review
Practical Use & Dosage
- Minimum Effective Dose
- 500mg/day
- Optimal Range
- 1000–1500mg pre-workout
- Upper / Caution Level
- 2600mg/day (highest studied dose)
- Timing
- 20–30 min pre-workout
- Best Format
- Capsule or powder (sulfate salt for stability)
- Bioavailability
- Oral bioavailability is moderate. Sulfate salt form provides stable, bioavailable agmatine. Crosses the blood-brain barrier for central neuromodulatory effects.
- Absorption Considerations
- Best absorbed on an empty stomach. Avoid taking with high-protein meals (arginine competition). The sulfate salt is the standard supplemental form.
Safety & Interactions
Side Effects
- •Mild GI discomfort
- •Lightheadedness at high doses (vasodilation)
- •Possible nausea on empty stomach
Contraindications
- Those on blood pressure medications (potent vasodilator)
Drug Interactions
- •Antihypertensives (additive hypotension)
- •Opioid analgesics (may potentiate)
- •Antidepressants (neuromodulatory interactions)
Who Should Avoid
- •Those on multiple vasodilatory medications
- •Individuals on opioid pain medications
- •Pregnant/lactating women
Monitoring
Monitor blood pressure when initiating. Start at lower dose (500mg) and titrate. Generally well tolerated in healthy adults at recommended doses.
Frequently Asked Questions
Auto-generated from indexed evidence — dosage, safety, interactions, and more.
When is Agmatine Sulfate typically used or indicated?
Agmatine Sulfate is most commonly used for: Nitric oxide modulation, Pump enhancement, Neuroprotection, Pain modulation. Endogenous neuromodulator synthesized in the brain, liver, and kidneys. Functions as a neurotransmitter/neuromodulator independent of the classical NO pathway. Stored in synaptic vesicles and released in a calcium-dependent manner.
How does Agmatine Sulfate work?
1) Arginase Inhibition: Blocks arginase enzyme that degrades arginine, preserving arginine pools for eNOS-mediated NO production. 2) Selective NOS Modulation: Inhibits inducible NOS (iNOS — pro-inflammatory) while supporting endothelial NOS (eNOS — vasodilatory), creating a favorable NO profile. 3) Neuromodulation: Agonist at imidazoline I1/I2 receptors, antagonist at NMDA receptors, and modulator of alpha-2 adrenergic receptors — conferring analgesic, anxiolytic, and neuroprotective properties. 4) Polyamine Modulation: Inhibits ornithine decarboxylase (ODC), regulating cellular proliferation pathways.
What is the recommended dose of Agmatine Sulfate?
The optimal range is 1000–1500mg pre-workout. with a minimum effective dose of 500mg/day. Best taken: 20–30 min pre-workout. Upper / caution level: 2600mg/day (highest studied dose).
What are the side effects of Agmatine Sulfate?
Reported side effects include: Mild GI discomfort; Lightheadedness at high doses (vasodilation); and Possible nausea on empty stomach. Monitoring: Monitor blood pressure when initiating. Start at lower dose (500mg) and titrate. Generally well tolerated in healthy adults at recommended doses.
Does Agmatine Sulfate interact with medications?
Known or theoretical interactions: Antihypertensives (additive hypotension); Opioid analgesics (may potentiate); and Antidepressants (neuromodulatory interactions). Always check with a clinician before combining with prescription medication.
Who should avoid Agmatine Sulfate?
Agmatine Sulfate is generally not recommended for: Those on multiple vasodilatory medications; Individuals on opioid pain medications; Pregnant/lactating women; and Those on blood pressure medications (potent vasodilator).
How strong is the evidence for Agmatine Sulfate?
Evidence level: Moderate (overall score 58/100), based on 2 indexed studies on SuppIndex.
Research & References (2)
Agmatine: multifunctional arginine metabolite and magic bullet in clinical neuroscience?
Comprehensive review of agmatine's neuromodulatory actions across imidazoline, NMDA, and alpha-2 adrenergic receptors, with evidence for neuroprotective, analgesic, and anxiolytic properties.
Agmatine as a NO modulator: mechanisms and therapeutic potential
Review detailing agmatine's dual NOS modulation — inhibiting iNOS (reducing harmful inflammatory NO) while preserving eNOS function (maintaining beneficial vascular NO).
Trademark Ingredients
Related Ingredients
Other top-rated ingredients in Pump and Performance Ingredients.
Nitrosigine®
82/100Inositol-stabilized arginine silicate complex that provides sustained elevation of plasma arginine (up to 6 hours) and silicon, enhancing eNOS-mediated nitric oxide production, vascular compliance, and cognitive flexibility during physical exertion.
Beetroot Extract
80/100Concentrated source of dietary inorganic nitrate that undergoes serial reduction via oral microbiome (NO₃⁻ → NO₂⁻) and tissue-level reduction (NO₂⁻ → NO) through the oxygen-independent nitrate-nitrite-NO pathway, enhancing blood flow and exercise efficiency.
Citrulline Malate
78/100Salt of L-citrulline and DL-malic acid (commonly 2:1); citrulline raises plasma arginine and NO; malate enters the Krebs cycle and may buffer fatigue.
Research Overview
Moderate EvidenceCite this ingredient
One-click citation export in APA, MLA, Chicago, BibTeX, or HTML. The URL below is stable and safe to link.
Stable URL
https://thesuppindex.com/ingredients/agmatine-sulfate
SuppIndex. (2026). Agmatine Sulfate: Evidence summary, dosage and clinical studies. Retrieved October 23, 2026, from https://thesuppindex.com/ingredients/agmatine-sulfate
Based on 2 indexed studies · Evidence level: Moderate.
Goal Ratings
Stack Compatibility
Pairs exceptionally with citrulline (citrulline provides arginine → agmatine prevents its breakdown = sustained pump). Can add Nitrosigine for triple-layer NO support. Compatible with most pre-workout ingredients.
Products (2)
Gorilla Mind
Gorilla Mode
Nutrabio
Agmatine Sulfate 500mg