L-Citrulline in Oral Pouches

L-citrulline is an amino acid and a dietary ingredient by statute. Its human research sits in the gram range: Bailey et al. (2015) used 6g per day in an exercise study, and Schwedhelm et al. (2008) studied 3g twice daily in a pharmacokinetic and pharmacodynamic trial. The working range from that literature is 3 to 6g per day.

Two forms are sold, and they are not interchangeable. L-citrulline is the free amino acid. Citrulline malate is a different salt with its own, separate effective-dose literature. A spec, a dose calculation, and a label all have to name the form actually used, and the full weight of that form counts against the pouch budget.

No, not at a studied dose, and a brand should hear that before it designs a pre-workout pouch around it. PouchMade's standard pouch is 0.6g, with 0.5g and 0.7g formats available, and the typical actives budget is 250 to 280 mg per pouch, about 300 mg at most. Filler, flavor, and sweetener make up the rest.

• Against a 3g dose, the full 300 mg maximum is 10 percent; against 6g it is 5 percent.
• Reaching 3g would take 10 pouches at 300 mg each, or 12 at a typical 250 mg; reaching 6g would take 20 to 24.
• In a stack where citrulline gets 100 mg, one pouch carries about 3 percent of a 3g dose, and a 3g dose would take 30 pouches.

Absorption does not close the gap either. Amino acids are zwitterions across the whole pH range of the mouth, which by general pharmaceutics principles means poor passive movement across the mouth lining; citrulline in a pouch is largely carried by saliva and swallowed, and there is no pouch-specific absorption data for it. Citrulline does not realistically fit the format as a functional active. At most it is a minor label inclusion in a formula whose real work is done by actives that fit, such as caffeine, and even that use should be disclosed with an exact milligram amount and no implied pump or performance effect.

The pouch market has effectively voted on this. In a PouchMade review of about 36 non-nicotine pouch formulas on major US marketplaces in September 2026, none listed L-citrulline or citrulline malate, and a wider scan of about 198 pouch products did not turn it up either. Citrulline is absent or rare in current pouch products, which is what the arithmetic predicts rather than an open gap in the market.

Moisture is the handling issue to plan for. Supplier documentation describes standard L-citrulline as hygroscopic, meaning it absorbs humidity from the air, and at least one non-hygroscopic grade is marketed, which implies the standard material is not. No pharmacopeial or peer-reviewed moisture-sorption data was found, so treat the hygroscopicity as supplier-documented: check loss on drying or water content on every incoming lot, and blend under controlled, low relative humidity until a real sorption curve exists. Water activity on the finished blend is the single most useful number for both caking and microbial risk.

We found no pouch-specific sensory data for citrulline, so taste has to be confirmed at the bench inside the full flavor system. The form decision also affects the flavor work: citrulline malate carries malic acid, so the malate form and the free amino acid should not be treated as drop-in replacements for each other in a finished flavor system.

Under 21 CFR 111.75(a)(1), every batch of a dietary ingredient needs at least one appropriate identity test; a supplier CoA cannot replace it, and a visual check cannot tell one white amino acid powder from another. The USP monograph for Citrulline sets 98.0 to 102.0 percent L-citrulline on the dried basis and uses L-Citrulline, N-Acetylornithine, and N-Acetyl-L-leucine reference standards, so a related-substances test for ornithine-type impurities is part of the monograph. IR against the USP reference standard or HPLC amino acid analysis are the standard approaches.

A useful CoA shows:

• Which form it is (L-citrulline or citrulline malate), matching the spec
• Identity method and reference standard, with the assay result against 98.0 to 102.0 percent
• Related substances, including ornithine-type impurities
• Loss on drying or water content, given the hygroscopicity
• Lead, arsenic, cadmium, and mercury by ICP-MS, and microbial counts under USP <2021> to <2023>

L-citrulline has no new dietary ingredient notification and no GRAS notice in FDA's posted lists, and no FDA objection history turned up; treat it as a pre-DSHEA amino acid and keep the basis documented. It is not on California's Proposition 65 list, and Amazon's dietary supplement policy does not name it as prohibited. Amazon requires third-party cGMP verification for dietary supplements, and if a pouch is listed as sports nutrition, Amazon adds an extra standard and mandatory heavy metal, microbial, and label-claim testing.

Claims are the real exposure. The FTC expects competent and reliable scientific evidence for a claim, and citrulline's evidence sits at 3 to 6g. A pouch carrying a small fraction of that cannot borrow those results. Keep claims structure/function, tied to the whole formula, with the DSHEA disclaimer, and do not imply a performance effect from citrulline at pouch doses.

For most brands, the honest recommendation is to leave citrulline in the tub and build the pouch around actives that fit at a studied dose. Pre-workout and performance concepts usually land in a functional pouch or a caffeine-led energy pouch. PouchMade formulates custom stacks through custom formulation at its FDA-registered, GMP-certified facility in Dallas, Texas. The first check for any requested ingredient is its studied dose against the actives budget, before any bench work. Beta-alanine and creatine face the same gram-dose problem. To see how a launch comes together, read how to launch a functional pouch brand.