Description of L-Glutamine – Drink Mix Powder
Short summary
OnEnergy L-Glutamine powder contains pure L-glutamine with no added flavors, sweeteners or other active ingredients. It is intended primarily for athletes and physically active individuals during periods of more intense physical strain, when they want to support post-workout recovery and supplement their intake of an amino acid that is naturally present in muscles.
6.2 / 10Our expert rating
Ingredient quality7.0
Formula transparency10.0
Effectiveness1.8
Safety10.0
Independent testing1.0
How to use
Mix 5 g of product (approximately 1.5 scoops) into a large glass of water and drink. To reach the doses used in research (approximately 5-10 g/day), you can take an additional dose during the day if needed, for example after training.
Pros and Cons
100% pure L-glutamine with no additional ingredients
Among the most affordable prices per gram in this product category
Simple preparation - just mix with water and drink
Published genuine user experiences from women using the product for post-workout recovery
Does not contain electrolytes, carbohydrates or other ingredients for comprehensive post-workout recovery
The instructions for use are rather sparse and do not clearly state the recommended daily frequency
Scientific support for effects on strength and body composition in healthy, trained adults is limited (Candow et al., 2001)
No independent laboratory test report is published on the product page
Suitable for
Individuals doing intensive strength training
Athletes preparing for competitions
People training several times a week
Athletes in recovery periods after demanding workouts
Unfortunately, we cannot guarantee that. In healthy, well-nourished people, an extensive review of research found no convincing support for claims that glutamine significantly strengthens the immune system (Gleeson, 2008). On the other hand, a more recent smaller study in combat sport athletes exposed to very high training loads shows possible benefits for mucosal immunity after intense periods (Melo et al., 2024). If you catch colds often despite a balanced diet and adequate rest, we recommend investigating the cause with a doctor as well, since there may be other reasons for this that a dietary supplement will not resolve.
The label instructions indeed do not state an exact daily frequency, so as a general guideline we can tell you that sports supplementation research most commonly uses approximately 0.1-0.3 g of glutamine per kilogram of body weight per day, which for an average adult corresponds to approximately 5-10 g per day (Gleeson, 2008). At a dose of 5 g per scoop, this means approximately 1-2 doses daily, for example one in the morning and one after training. We recommend not exceeding your total daily intake from all sources (including any other supplements) without consulting a professional.
As far as the active ingredient itself is concerned, yes - all products in this category contain 100% pure L-glutamine powder with no flavors or fillers, and glutamine is a single amino acid for which (unlike, for example, magnesium) there are no different chemical forms that would affect effectiveness. Differences between products lie mainly in price, package size, brand, and the extent of disclosed testing information, but not necessarily in the quality of the ingredient itself. If purity of the glutamine and price per gram are what matter to you, this product is a fully comparable choice to more expensive alternatives.
Generally speaking, mixing glutamine with plain water, juice, or another beverage poses no issues, since simple dissolving does not change how the ingredient works. One small study in boxers did examine the combination of alkaline water and glutamine in relation to salivary enzyme activity and testosterone concentration (et al., 2024), but this is a specific study in highly trained athletes, not a generally confirmed recommendation for the wider population. For everyday use, it is entirely sufficient to mix glutamine with plain water to your own taste.
May contain traces of milk, fish, eggs, crustaceans, oats, wheat and soy.
The recommended daily doses must not be exceeded
People with liver impairment (e.g. cirrhosis) or other chronic conditions should consult a doctor before use
Pregnant and breastfeeding women should consult a doctor before use
Ingredients
100% pure L-glutamine powder. Manufactured in a facility that also processes products containing milk, fish, eggs, crustaceans, oats, wheat and soy.
Form:Powder
Dose:5 g
Available flavors:Unflavored
L-Glutamine:5 g
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