L-Glutamine
Discover L-glutamine as pure powder and as capsules. We explain why 5 g doses are usually taken as powder, when capsules make more sense, and how to fit this amino acid into your daily or training routine.Read more →
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L-glutamine powder and capsules: what to know before you choose
What L-glutamine is
L-glutamine is an amino acid, one of the building blocks your body uses to make protein. It is the most abundant free amino acid in the body, and your body produces it itself, which is why it sits in the non-essential group of our amino acid range. You will often see it called conditionally essential. That means the body may use more than it makes during illness, injury or a heavy training block. Supplements exist for exactly that gap.
Most people who buy it fall into two groups. One trains hard and uses glutamine around workouts, next to protein or branched-chain amino acids. The other takes it in the morning on an empty stomach with digestion in mind. Both groups usually end up at the same serving: about 5 g a day, roughly one level teaspoon of powder.
We are honest about the evidence
We will not promise you a result here. The European food safety authority (EFSA) has assessed glutamine for muscle mass, for the intestinal lining and for immune function. It approved no health claim for any of them, and those assessments still sit behind the claims rules in Great Britain. So we may not tell you what glutamine does in your body, and neither may anyone else. What we can give you is the form, the amount per serving and what people use it for. If a shop promises you a repaired gut, that promise is not permitted.
Powder, capsules and blends
Powder and capsules contain the same free-form L-glutamine. The difference is practical, not chemical.
- Powder: around 5 g per scoop, the lowest cost per gram, almost no taste, but you need a glass or shaker.
- Capsules: usually 500 mg to 1000 mg each, so a 5 g serving means five to ten capsules. Easier for travelling and for smaller amounts.
- Blends: glutamine mixed into a recovery or amino formula. Convenient, as long as you check the grams of glutamine per serving.
How we choose the glutamine we stock
We judge three things: the form, the dose per serving and whether a combination genuinely adds something. We prefer plain free-form L-glutamine without fillers, because then you set the dose yourself. Powders have to state the grams per scoop, not hide glutamine inside a blend. Capsule products have to say how many capsules make a full serving, so nobody takes 500 mg while expecting 5 g. Fermented, plant-based glutamine is our default, so vegan buyers are covered. We buy directly from the brands, and every product passes our compliance team first. You can read how we select brands and products.
Who it suits, and who can skip it
Glutamine makes most sense once the basics are in place: enough protein, decent sleep, a training load your body actually has to recover from. It is also a common choice among people already looking at supplements for digestion. Give it two to three weeks of consistent daily use before you judge it, because single doses tell you little. If you train moderately and already hit your protein target, your own production plus food may cover your needs, and a protein powder is probably the better buy. Many labels advise against use during pregnancy and breastfeeding, and ask you to check with a doctor if you take medication or are under medical supervision, so read yours before you start.
Frequently asked questions
L-glutamine is an amino acid, one of the small building blocks the body uses to make protein. It is the most abundant free amino acid in the body, and your body can make it from other amino acids, so it counts as non-essential. You also get it from food: meat, fish, eggs, dairy, soya, beans and cabbage all contain it. Supplements provide it in free form, which simply means the amino acid on its own rather than bound inside a protein.
