Alanylglutamine.
Research-backed amino acid with potential health benefits. Pulls water and electrolytes into your cells for better hydration. Helps fuel your gut lining and may improve endurance during long workouts.
Reviewed March 2026
- Category
- Amino acid
What Alanylglutamine is, and what it does.
- Does it work
- Suits endurance athletes and people training long or in heat, where fluid uptake and glutamine supply do the most work. It also suits anyone who wants glutamine in a drink that sits for hours.
- How much to take
- 1-3 grams per serving, usually mixed with electrolytes. Take it before or during long, sweaty workouts.
- Time to feel it
- It works session by session. Any difference in fluid uptake lands inside the same workout, usually through the back half of a long or hot effort.
- The first dose
- Not much. If you're dehydrated, you might notice better fluid absorption, but it's not a dramatic feeling. It works on a per-session basis.
- With regular use
- Consistent use can lead to better hydration status and potentially faster recovery from grueling sessions. It's not a muscle builder; it's a performance and recovery tool.
- How well tolerated
- Well tolerated. It's GRAS (Generally Recognized as Safe). Well-tolerated and avoids the gut issues some people get from large doses of L-glutamine.
- How it feels
- Like you're slightly more resilient to heat and long efforts. You don't 'feel' it, you just 'fade' less. The absence of a negative feeling is the main effect.
- The overlooked benefit
- The peptide bond is the point. Free glutamine breaks down in water while this does not, and it enters through the peptide transporter, so it is not competing with free amino acids for a carrier.
500 to 2,000mg a day is where Alanylglutamine works.
Source: Hoffman et al. J Int Soc Sports Nutr 2010
The proof, claim by claim.
These words describe the research, not the molecule's worth. Research strength is how much work stands behind one claim, and it is never a product score.
Alanylglutamine is documented in the library; the clinical read is in the queue. Nothing about the strength of the research prints until the read is done.
- Fluid and electrolyte uptake during exerciseRandomised trial
- Endurance performance during prolonged or heat-stressed exerciseRandomised trial
- Plasma glutamine availability after oral dosingRandomised trial
- Intestinal barrier function and enterocyte fuel supplyAnimal study
- Glutamine stability in aqueous and heat-treated solutionIn vitro study
- Absorption through the proton-coupled peptide transporter PEPT1In vitro study
Questions people ask about Alanylglutamine.
- Is this better than regular glutamine?
- For mixing into drinks, yes. It's way more stable in water. For absorption and hydration, the evidence points to yes.
- Will it help me build muscle?
- Not directly. It's for hydration and endurance, which helps you train harder. But it's not a primary muscle-building supplement like protein or creatine.
- Can I take it with my pre-workout?
- Yep. No conflicts. Some electrolyte mixes already include it for this reason.
- Is it just for endurance athletes?
- Mostly. It shines during long, sweaty exercise. For desk jockeys, plain water is probably enough.
- What does it taste like?
- It's pretty neutral. Slightly savory, but unnoticeable when mixed in a flavored drink.
- When should I take it?
- 30-60 minutes before a long workout or sip it during. The goal is to have it available when you're sweating.
Why these belong in the same formula. Each row says what the basis is, from settled biochemistry through to a trial that measured the pair.
The dipeptide is taken up intact by the PepT1 peptide carrier and then split, releasing free glutamine. It carries the same amino acid in a more soluble and heat stable form.
Splitting the dipeptide releases alanine alongside glutamine. Alanine feeds the glucose alanine cycle, so the two arrive together in a fixed one to one ratio.
Sodium coupled solute uptake is what pulls water across the intestinal wall. Rehydration formulas pair sodium with alanylglutamine because the dipeptide adds a second sodium linked absorption route.
Glutathione is built from glutamate, cysteine and glycine. Glutamine supplies the glutamate residue while cysteine is the rate limiting one, so the two cover different halves of the same synthesis.
Glycine is ligated last in glutathione synthesis. Supplying it with a glutamine source covers two of the three residues.
NAC raises intracellular cysteine, the limiting residue for glutathione. Glutamine supplies the glutamate arm of the same tripeptide.
Enterocytes convert glutamine into citrulline, which the kidney turns into arginine. Adding citrulline directly and supplying its precursor act on the same route at two points.
Glutamine derived citrulline is the main endogenous source of arginine outside the diet. The pairing loads the same nitrogen route at precursor and product level.
Glutamine is the preferred fuel of small intestine enterocytes while butyrate is the preferred fuel of colonocytes. Together they cover both segments rather than duplicating one.
Zinc contributes to normal tight junction protein expression while glutamine is the enterocyte fuel supporting normal cell turnover. The two roles do not overlap.
Alanine aminotransferase requires pyridoxal 5-phosphate to move the amino group between alanine and pyruvate, the reaction that lets the alanine half of this dipeptide enter gluconeogenesis or be disposed of. Without adequate B6 status that transfer is limited. This is settled enzymology rather than a supplementation finding.
Alanylglutamine is hydrolysed to its two free amino acids by peptidases, some at the enterocyte brush border and some in plasma. Supplemental pancreatic enzyme preparations act in the lumen upstream of that and are not the route this dipeptide depends on. The row exists to note that the dipeptide does not need a digestive enzyme supplement to be split.
Glutathione is assembled from glutamate, cysteine and glycine, and glutaminase converts glutamine to glutamate to feed that pool. The glutamine half of this dipeptide therefore supports the glutamate limb, while cysteine remains the usual rate-limiting one. Supplying glutathione or its cysteine precursor alongside addresses a different limitation.
Glutamine is absorbed by sodium-coupled transporters, and that coupling drags water across with it, which is the reasoning behind adding glutamine-based dipeptides to oral rehydration formulations. The dipeptide is used because free glutamine is unstable in solution while the dipeptide is not. Whether the pairing changes a clinical rehydration outcome has not been established here.
Whey protein supplies bound glutamine and glutamate as part of a complete amino acid profile, released over the course of digestion. The dipeptide delivers a stable, water-soluble glutamine load that survives being sat in a drink. The two occupy different roles in a formula rather than duplicating one.
Leucine is the amino acid signal that activates mTORC1 and initiates translation, while glutamine influences amino acid transport and cellular volume in the same cells. Signalling and substrate supply are separate requirements for protein synthesis. The mechanistic pairing is well described; a combination trial of this specific dipeptide with leucine is not.
Small-intestinal enterocytes use glutamine as a primary respiratory fuel, while colonocytes preferentially oxidise butyrate produced by fermentation of resistant starch. The two nutrients therefore feed different segments of the same gut lining. This is standing physiology rather than a tested combination.
In a mouse study, alanylglutamine supplementation shifted gut microbiota composition and the metabolites derived from it. Live organism supplements act on the same community from the other direction. This is a non-human finding and the pairing has not been tested in people.
This yeast is used for its effects on the intestinal lining and luminal environment, while glutamine supply is a fuel-side contribution to enterocyte metabolism. The rationale is that they act on the same tissue through unrelated routes. No study has tested the two together.
Taurine and glutamine both act as organic osmolytes that cells accumulate to hold volume under osmotic stress. Their transporters and regulation differ, so accumulating one does not substitute for the other. Cell-level physiology only, with no combination data.
Creatine and alanylglutamine appear together in ready-to-mix sports products because both dissolve and hold up reasonably in water, which free glutamine does not. Their mechanisms are unrelated: phosphagen buffering on one side, amino acid supply on the other. Nothing measured about the combination.
Nothing specific on file for Alanylglutamine. Match the label to the daily amount above, and tell your doctor what you take.
Not medical advice. Show the label to your pharmacist.What Alanylglutamine actually does.
Alanylglutamine is a dipeptide, L-alanine joined to L-glutamine by a single peptide bond, which is why it behaves as one molecule in solution rather than as two free amino acids.
Free glutamine degrades in aqueous solution, cyclising to pyroglutamate and releasing ammonia, and the rate rises with temperature and time. Blocking the alpha-amino group in a dipeptide bond removes that route, which is the reason the dipeptide is used in liquid and heat-treated formats.
Small peptides are absorbed by the proton-coupled oligopeptide transporter PEPT1 on the enterocyte brush border, a route distinct from the sodium-coupled and system-specific transporters that carry free amino acids. A dipeptide therefore does not compete with free amino acids for the same carrier.
Peptide-bound delivery is hydrolysed to its constituent amino acids by brush-border and plasma hydrolases, including membrane-bound aminopeptidases and gamma-glutamyltransferase, so what circulates after absorption is free alanine and free glutamine rather than the intact dipeptide for long.
The forms it comes in.
The essence, in one line each.
- Frequent intravenous growth hormone pulses given together with alanylglutamine were studied in adults under prolonged intensive care; because both interventions were given together, no effect can be attributed to alanylglutamine on its own.Open-label trial. Duska F et al., 2008 (Growth Hormone and IGF Research). PMID 17709266 ↗
- Alanylglutamine reduced airway inflammation measures in mice and was associated with shifts in gut microbiota and the metabolites derived from them; a mechanism-level animal finding, not human evidence.Animal study. Liu SK et al., 2020 (Oxidative Medicine and Cellular Longevity). PMID 33456673 ↗
These are the studies our verdict leans on, chosen from the 2 we read for Alanylglutamine. The full linked list is below.
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. This information is for educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease. Consult your healthcare provider before starting any supplement regimen.