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L-Glutamine
Quick Facts
- What it is: L-Glutamine is the most abundant amino acid in the human body, serving as a key fuel source for gut cells, immune cells, and muscle tissue.
- Main uses: Widely used to support gut lining health, speed muscle recovery, reduce sugar cravings, and maintain immune function during stress or illness.
- Best for: Leaky gut / gut lining repair, Muscle recovery, Sugar and alcohol cravings
- Active ingredients: L-Glutamine
- Forms: powder, capsule, tablet, IV solution (clinical use)
- Time to effect: Gut and craving benefits often noticed within 1-2 weeks; muscle recovery improvements typically within 2-4 weeks of consistent use.
- Side effects: Generally very well tolerated at standard doses; high doses may cause mild digestive discomfort in some people.
Keep track of what you try
The app remembers what you have started, including L-Glutamine, reminds you when to take it, and records whether it helped — so the next decision is based on your own notes rather than memory.
What is L-Glutamine?
L-Glutamine is a non-essential amino acid that is found abundantly in the body. It is produced naturally by the body and is also obtained through the diet. L-Glutamine plays a crucial role in various bodily functions such as the immune system, digestive system, and brain function.
How does it work?
L-Glutamine works by aiding in the production of proteins that help repair and regenerate tissues in the body. It also helps to strengthen the immune system and promote healthy digestion. L-Glutamine has been used for medicinal purposes to treat a wide range of conditions such as gastrointestinal disorders, muscle wasting, and immune dysfunction.
What are the active ingredients that are important for its medicinal properties?
The active ingredient in L-Glutamine is the amino acid L-glutamine.
What forms does it come in?
L-Glutamine is available in various forms such as capsules, powder, and liquid.
What can happen if I have an imbalance or deficiency?
A deficiency of L-Glutamine can lead to muscle wasting, impaired immune function, and digestive issues. If you have an imbalance or deficiency, it is recommended to consult a healthcare professional to determine the appropriate course of treatment.
When was it first used for medicinal purposes?
L-Glutamine has been used for medicinal purposes for several decades, with early studies dating back to the 1980s.
If this is an emergency
Some reactions to L-Glutamine need urgent care. Call your local emergency number or go to an emergency department straight away — do not wait to see whether it passes.
Who should avoid L-Glutamine?
- Do not take high doses if you have liver disease, unless your doctor is guiding you.
- Do not take high doses if you have kidney disease, unless your doctor is guiding you.
- Don't start it on your own if you have bipolar disorder or past mania.
- Avoid doses above 15 g a day unless a doctor is watching you.
- Avoid starting at a big dose, since gas, bloating and loose stools are more likely.
- Stop taking it if you get bad nausea or loose stools that do not settle.
- Do not take glutamine if you have seizures or take seizure drugs, unless your doctor agrees.
- Never add it to a low-protein diet your doctor has ordered without asking them first.
- Avoid it if you react badly to MSG (monosodium glutamate), a related food additive.
- Don't take supplement doses while pregnant or breastfeeding unless your doctor approves.
When should you see a doctor?
Mild gas, loose stools or a headache in the first week is common. Drop back to a smaller dose and take it with food. If it still bothers you after a week, talk to your doctor.
Some signs need faster help. Call your doctor the same day if you feel confused, very sleepy or shaky, or your speech slurs. This matters most if your liver or kidneys are weak, or if you take large doses.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
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