L-Glutamine Guide: What It Is, How Much to Take and When
L-glutamine is one of the classic gym supplements, often found next to creatine and BCAAs. But what exactly is it, why is it called "conditionally essential", and how do you take it? This guide explains L-glutamine in plain English.
What Is L-Glutamine?
L-glutamine is an amino acid, one of the building blocks of protein. It is the most abundant free amino acid in the human body. Large amounts are found in muscle tissue and in the blood.
Your body can make glutamine itself, and you also get it from food. Good sources include meat, fish, eggs, dairy, beans, tofu and cabbage.
What Does "Conditionally Essential" Mean?
Amino acids fall into three groups:
- Essential: the body cannot make them, so they must come from food.
- Non-essential: the body makes enough on its own.
- Conditionally essential: normally the body makes enough, but in some situations, such as periods of intense physical stress, demand can be higher.
Glutamine belongs to the third group. That is part of why it is popular with active adults and athletes.
Who Uses L-Glutamine?
- Athletes and gym-goers as part of their training routine
- People who do intense or frequent training
- Anyone who wants a clean, single amino acid to add to their shake
L-Glutamine vs. BCAAs vs. EAAs
- BCAAs are three amino acids: leucine, isoleucine and valine.
- EAAs are all nine essential amino acids.
- L-glutamine is a single, conditionally essential amino acid.
They are not competitors. Many people combine glutamine with a BCAA or protein shake. Read more in BCAAs vs EAAs: What Really Builds Muscle.
How to Take L-Glutamine
- Dose: a common serving is around 3 to 5 g per day. Follow your product's label.
- Timing: many people take it after training, or in the morning on rest days. Consistency matters more than exact timing.
- Mixing: unflavored glutamine powder is nearly tasteless and dissolves in water, juice or protein shakes.
Tip: add it straight to your post-workout protein shake, so you do not need an extra step.
Can You Combine It with Creatine?
Yes. L-glutamine, creatine and protein are often taken together after training. Read our Creatine Monohydrate guide for more on creatine.
Who Should Be Careful?
Talk to your doctor before use if you have kidney or liver disease, are pregnant or nursing, are under 18, or take medication. Do not exceed the recommended dose.
Checklist Before You Buy
- Is it pure L-glutamine with no fillers?
- How many grams per scoop?
- Is it unflavored, so it fits into any drink?
- Is it tested for heavy metals?
- Is it made in a GMP-certified facility?
Our L-Glutamine
SUPPLI-X Pure L-Glutamine Powder delivers 3.15 g pure L-glutamine per scoop, with only silicon dioxide as an anti-caking agent. Unflavored, vegan, gluten-free, lactose-free and non-GMO. Made in the USA in a GMP-certified facility, with heavy metals analyzed under ISO/IEC 17025 accreditation.
FAQ
What is L-glutamine?
An amino acid and building block of protein. It is the most abundant free amino acid in the human body.
When should I take L-glutamine?
Many people take it after training or in the morning on rest days. Consistency matters more than timing.
Can I mix L-glutamine with protein or creatine?
Yes. Unflavored glutamine mixes easily into protein shakes and stacks with creatine.
Is L-glutamine vegan?
SUPPLI-X L-Glutamine is vegan, gluten-free and non-GMO.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. If you are pregnant, nursing, taking medication or have a medical condition, talk to your healthcare provider before using any supplement.
