NSTK · 01.2026Independent supplement reference
NutriStack
Edition 1.0Updated August 1, 2026

Supplement × Supplement·Evidence index

Agmatine Sulfate and L-Citrulline: what the published research says

PubMed indexes 3 records that name Agmatine Sulfate and L-Citrulline together, either in the title or in an interaction, co-administration, or pharmacokinetic context. Each one is listed below with its study design and, where the abstract states one, the authors’ own conclusion, quoted and linked. This page reports that literature. It does not tell you whether to combine them.

Read this first

An evidence index, not guidance.

Every statement below is attributed to a named, dated, linked source.

This page lists published research relevant to Agmatine Sulfate and L-Citrulline. It deliberately does not state whether the combination is safe, whether it interacts, in which direction, at what dose, or how far apart to take them.

The research

3 studies naming Agmatine Sulfate and L-Citrulline.

Strongest relevance first: papers naming both substances in the title, then human trials and systematic reviews.

Memory-related changes in L-citrulline and agmatine in the rat brain.

Hippocampus · 2009 · PMID 19173225

Animal study

“These results demonstrate T-maze training-induced region-specific increases in L-citrulline and agmatine. Significant positive correlations between prefrontal and perirhinal agmatine levels and animals' performance in the T-maze further suggest the direct involvement of agmatine in learning and memory processing.”

Liu et al. · From the abstract

Names both Agmatine Sulfate and L-Citrulline in its title.

Effect of agmatine on brain L-citrulline production during morphine withdrawal in rats: a microdialysis study in nucleus accumbens.

Brain research · 2007 · PMID 17182008

Animal study

“Agmatine and l-NAME treatments significantly suppressed the increase in l-citrulline levels compared to physiological saline-treated rats in this setting. The results suggest that the release of l-citrulline in NAcc may be involved in the processes of morphine withdrawal and agmatine as an endogenous inhibitor of NO synthase may be one of the factors involved in the changes in the physiology and behavioral state during opioid withdrawal and may have pharmacological…”

Yananli et al. · From the abstract

Names both Agmatine Sulfate and L-Citrulline in its title.

Determination of agmatine, arginine, citrulline and ornithine by reversed-phase liquid chromatography using automated pre-column derivatization with o-phthalaldehyde.

Journal of chromatography · 1988 · PMID 3372641

“Response factors relative to the internal standard, homocysteic acid, were 1.16 (agmatine and arginine), 1.03 (citrulline) and 0.34 (ornithine). The applicability of the method to the measurement of arginase, arginine deaminase, arginine decarboxylase and other enzyme activities in bacterial extracts was examined.”

Patchett et al. · From the abstract

Names both Agmatine Sulfate and L-Citrulline in its title.

Limitations

What this evidence cannot tell you.

Search-based evidence indexes have real limits, and it is worth being explicit about them:

NutriStack

Track what you actually take.

NutriStack is a free iPhone app for organising a supplement routine: what you take, when, and what the published record says about it. Its exploratory interaction checker covers Agmatine Sulfate, L-Citrulline, and several hundred other substances.

The checker is a research and organisation tool, not a clinical decision aid, and its per-pair assessments are excluded from search until they pass claim-level review.

NutriStack is an informational and organizational tool, not a medical service, and not a substitute for professional advice. Always consult a qualified healthcare professional before starting, stopping, or changing any supplement or medication.