Arginine pyroglutamate

Amino-acidArginine salt

What is it

Arginine pyroglutamate is a salt that combines the amino acid L-arginine with pyroglutamic acid (an intermediate in the glutamate cycle). It has been used in supplements aimed at cognitive function and as a precursor to nitric oxide production.

Evidence for 2 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Memory / cognition (older adults)

Limited Evidence

Small older trials (1980s-90s) of arginine pyroglutamate plus lysine reported improvements in verbal memory in some older adults. Modern replication is limited.

Nitric oxide production / circulation

Limited Evidence

Arginine raises nitric oxide in some studies but oral bioavailability is poor. Citrulline is generally more effective for this purpose.

How it works

After ingestion, the salt dissociates into L-arginine and L-pyroglutamate. L-arginine is converted to nitric oxide via nitric oxide synthase, which dilates blood vessels and supports blood flow. Pyroglutamate (also called pyroglutamic acid or 5-oxoproline) crosses the blood-brain barrier and has been studied for possible nootropic effects. A small body of research from the 1980s-90s suggested arginine pyroglutamate combined with lysine could improve verbal memory in some older adults. Modern research is limited, and findings have not been widely replicated.

Dosage

Older trials used 1.5-3 grams per day, sometimes combined with lysine. Modern supplements vary. DSLD label data did not include a median dose.

When and how to take it

WHEN: With or between meals. Older memory studies used twice-daily dosing. HOW: Capsule or powder mixed in water.

1 commercial form

Compare the main delivery options and what they’re best suited for.

Arginine pyroglutamate (capsule/powder)

Less common form; often combined with lysine.

Modest plasma arginine increase; pyroglutamate well absorbed.

Safety

Generally well tolerated. Possible GI upset (gas, mild diarrhea) at higher doses. Arginine can lower blood pressure and may cause flushing in sensitive individuals.

Who should be cautious

People with low blood pressure, history of recent heart attack, or active herpes outbreaks should consult a clinician. Avoid combining with vasodilators without supervision.

Interactions

May potentiate blood pressure-lowering medications, nitrates, and PDE5 inhibitors via nitric oxide pathway. Theoretical herpes-related concerns from arginine alone, but the lysine in some formulations may offset this.

Food sources

Arginine: nuts, seeds, meats

Amount
Varies widely
%DV
—

Frequently asked questions

Will it improve my memory?⌄

Evidence is limited and dated. Effects, if any, are modest and have not been consistently demonstrated.

Is this better than plain L-arginine?⌄

There is no strong evidence that the pyroglutamate form is superior to other arginine salts for raising arginine levels.

References

Arginine pyroglutamate on Wikidata — Wikidata link

Arginine pyroglutamate on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Arginine pyroglutamate (PubMed search) — PubMed link

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Evidence-based·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.