L-Glutamine Powder or Capsules: Which Should You Choose?
If you have ever looked closely at the label on a protein shake, you may have spotted L-glutamine in the small print. When you decide to buy it as a single ingredient, however, you are met with a choice that can seem puzzling: a pouch of powder stating 5 grams per serving, or capsules marked 850mg. This is more than a simple preference for how you take your supplement. A single 5g serving of the powder provides nearly six times the L-glutamine of one 850mg capsule, a significant difference that this guide is here to explain.
Our powder and our capsules are each taken once a day, with a serving costing from about 10p [3]. Below, we break down what each number on the label means, compare the cost per gram in each format, and help you find the pouch that fits your routine.
L-glutamine powder and capsules at a glance
- Who it suits: anyone who wants L-glutamine on its own, as an unflavoured powder for shakes or as one vegan capsule a day.
- What it is: an amino acid made by fermentation, so the powder and the capsules are vegan [3].
- Powder: one heaped teaspoon gives 5g of L-glutamine and nothing else, for about 13p a day.
- Capsules: one gives 850mg, with 5mg of BioPerine black pepper extract, for about 10p a day.
- Price per gram: powder about 3p, capsules about 12p.
- Good to know: the powder pouch has no scoop, to cut plastic, so a kitchen teaspoon does the job.
L-GLUTAMINE POWDER · 500G
£12.99 · 100 servings · 1 heaped teaspoon, 5g, per day · L-glutamine and nothing else · unflavoured · about 13p a day
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L-glutamine powder or L-glutamine capsules: which is right for you?
Right, let’s get to the main point of confusion: the powder is measured in grams and the capsules in milligrams. It’s a much bigger difference than it sounds.
L-glutamine powder: 5g a day from one ingredient
Want grams? Our L-Glutamine Powder is L-glutamine and nothing else: a heaped teaspoon gives 5g, and the 500g pouch lasts 100 days at about 13p a day.
It’s unflavoured, so it goes into water, a smoothie or a protein shake without changing the taste much.
L-glutamine capsules: 850mg with nothing to measure
Hate the faff of measuring and stirring? Our L-Glutamine 850mg capsules give 850mg in one capsule a day, for about 10p a day. Per gram that’s about four times the price of the powder, which is what the convenience costs.
L-GLUTAMINE 850MG · 90 VEGAN CAPSULES
£8.99 · 90 servings · 1 capsule per day · L-glutamine 850mg · BioPerine 5mg · about 10p a day
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L-glutamine capsules 500mg: the smaller amount
Prefer a smaller amount in each capsule? Our 500mg pouch holds 90 of the same vegan capsules, each with 500mg of L-glutamine, for £8.99, about 10p a day [3]. It costs the same as the 850mg pouch, so the choice is simply how much you’d rather have in each capsule.
You’ll find all three in our L-glutamine range, part of our wider amino acids and sport and fitness ranges. Curious about other amino acids? Glutamine’s near namesake, the smallest of them all, has a guide too: our glycine guide.
L-glutamine 5g on the label: grams, a heaped teaspoon and 100%
Turn the powder pouch over expecting a long list of additives and you’ll find almost nothing. One heaped teaspoon is 5g, the pouch holds 100 of them, and the ingredients list is a single line: L-glutamine, 100%.
5g = 5,000mg, which is nearly six 850mg capsules · 500g ÷ 5g = 100 days · £12.99 ÷ 100 = about 13p a day · price per gram: powder about 3p, 850mg capsules about 12p.
L-Glutamine Powder 500g and L-Glutamine 850mg capsules, nutrition panels [3]
That 100% isn’t a boast. It means there’s no flavouring, sweetener or filler in the pouch, so 5g of powder is 5g of L-glutamine.
Pick the capsules and you’ll see two more ingredients on the label. The shell is plant-derived hypromellose, and each capsule also carries 5mg of BioPerine. This branded black pepper extract has its own line on the panel, just beneath the L-glutamine.
Fermented L-glutamine and what the L stands for
Our L-glutamine is made by fermentation, not taken from animal protein, which is why the front can say vegan. As for the letter, most amino acids come in a left-handed form, written L, and a right-handed one, written D. The L-form is the one found in proteins, and it’s the one in our pouch [2].
L-glutamine powder vs L-glutamine capsules: how they compare
The table puts our three labels side by side: what each declares, and who it suits. Prices are correct at the time of writing.
1 heaped teaspoon, 5g · L-glutamine and nothing else · unflavoured · no scoop in the pouch
Choose if you want grams, not milligrams, at the lowest price per gram · vegan · 100 days · £12.99: about 13p a day, about 3p per gram
1 capsule · L-glutamine 850mg · BioPerine black pepper extract 5mg · hypromellose shell
Choose if you want 850mg in one capsule a day, with nothing to measure · vegan · three months · £8.99: about 10p a day, about 12p per gram
1 capsule · L-glutamine 500mg · the same shell and black pepper extract
Choose if you want 500mg in each capsule · vegan · three months · £8.99: about 10p a day, about 20p per gram
How to compare any L-glutamine supplement
Comparing another brand? Turn every serving into grams, then divide the price by the grams in the pack. Check the ingredients list for flavourings and sweeteners, and see whether a scoop is included or you’ll be using a teaspoon.
What is L-glutamine, and where does it come from?
You see amino acid on the pouch, but what does that mean? Think of it as a building block: L-glutamine is a proteinogenic amino acid, which is a technical way of saying it’s one of the amino acids that proteins are made from [2]. Glutamine is found in protein foods such as meat, fish, eggs, dairy and beans.
A supplement is a straightforward way to know exactly how much you’re getting each day: 5g in a heaped teaspoon of our powder, or 850mg in one capsule [3]. Ours is made by fermentation rather than extracted from food.
You’ll see two asterisks beside it on the panel. They mean no Nutrient Reference Value exists for L-glutamine, so no label can show you a percentage of a daily need.
How to take L-glutamine powder and capsules
You’ve opened the pouch, but where’s the little plastic scoop? There isn’t one: we leave it out to cut plastic waste, so use a kitchen teaspoon. The powder label says one heaped teaspoon, 5g, per day, stirred into a drink, a smoothie or a protein shake, and the capsule label says one capsule per day.
Store the pouch in a cool, dry place out of direct sunlight, and keep it out of reach of young children.
One ingredient, one teaspoon
If you want a straightforward L-glutamine supplement with nothing added, the 500g pouch gives you a 5g serving for 100 days, at about 13p a day.
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L-glutamine supplement FAQs
1. What are the benefits of an L-glutamine supplement?
UK law lets a food supplement carry only the health claims authorised on the GB register, and none has been authorised for glutamine or for black pepper extract [1]. What the label gives you instead is the exact amount in every serving: a heaped teaspoon of powder gives you 5g of L-glutamine and nothing else, and one capsule gives you 850mg [3].
2. Is L-glutamine powder cheaper than L-glutamine capsules?
Per gram, the powder is much cheaper: about 3p versus about 12p for the capsules. Per day, the capsules cost less because the serving size is much smaller.
3. How do I measure L-glutamine 5g without a scoop?
The label’s serving is one heaped teaspoon, and an ordinary kitchen teaspoon is what it means. The pouch leaves the scoop out to reduce plastic waste.
4. Is fermented L-glutamine vegan?
Yes. It’s made by fermentation, the powder front says 100% vegan formula, and even the capsule shell is plant-derived hypromellose. That’s why you’ll find all three pouches in our vegan range.
5. Can I take L-glutamine every day?
Yes. Each label gives a daily amount, one heaped teaspoon of powder or one capsule, so it’s designed for daily use [3]. The label also says it isn’t intended for children, or for pregnant or breastfeeding women.
6. Does L-glutamine powder have a taste?
It’s unflavoured, and the label suggests mixing it into drinks, smoothies or protein shakes.
7. How long does a pouch of L-glutamine powder last?
The 500g pouch holds 100 heaped teaspoons of 5g, so at one a day it will last you 100 days, at about 13p a day [3]. If you prefer capsules, each pouch holds 90 of them, a three-month supply at one a day.
8. What is BioPerine in L-glutamine capsules?
BioPerine is a branded black pepper extract, and you’ll find 5mg of it in each of our L-glutamine capsules [3]. If you’d rather have L-glutamine and nothing else, the powder is exactly that.
If you want grams at about 3p each, choose the L-Glutamine Powder. If you’d rather swallow one capsule and measure nothing, choose the 850mg capsules at about 10p a day. Either way, you now know that 5 grams and 850mg are very different amounts, and what each one costs.
References
Checked against the product labels and the GB Nutrition and Health Claims Register, September 2026.
[1] Department of Health and Social Care. Great Britain nutrition and health claims (NHC) register, GOV.UK (glutamine entries, all non-authorised; no entry for black pepper extract). Accessed 2026-09-27. View Source
[2] National Center for Biotechnology Information. PubChem Compound Summary for CID 5961, Glutamine (ChEBI description: an optically active, proteinogenic amino acid with L-configuration). Accessed 2026-09-20. View Source
[3] Alpha01. L-Glutamine Powder 500g and L-Glutamine 850mg and 500mg capsules: pouch fronts, nutritional information panels, ingredients, suggested use, storage, caution and prices. Accessed 2026-09-27. View Source
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