Description of Glutamine
Short summary
4Endurance Pro Glutamin contains 100% pure, fermented L-glutamine powder, intended primarily for athletes under heavy physical strain. It is suitable for periods of intensive training, competition preparation or reduced energy intake. The formula, free of unnecessary additives, is designed to support recovery and to supplement glutamine during periods of increased physical activity.
5.6 / 10Our expert rating
Ingredient quality6.5
Formula transparency10.0
Effectiveness1.8
Safety8.0
Independent testing1.0
How to use
Mix 1 scoop (5 g) with water. You can take up to 3 scoops per day. If you are in a caloric deficit: 1 scoop before training and 1 after training, and on rest days 1 scoop before breakfast and 1 before bed. If you are in a caloric surplus: 1 scoop before training and 1 after training, and on rest days 1 scoop before breakfast or before bed.
Pros and Cons
Fermented, 100% pure L-glutamine – no flavors, sweeteners or unnecessary additives
Full dose (5 g L-glutamine) per scoop clearly disclosed on the label
Flexible dosing up to amounts used in research (up to 15 g/day at 3 scoops)
One of the most affordably priced glutamine products in this category
Contains only glutamine – no additional amino acids, electrolytes or other ingredients for comprehensive recovery
Neutral taste, which may not suit users who prefer flavored drinks
For occasional recreational users with a lower training load, the benefits are less pronounced than for intensively trained athletes
No publicly available independent laboratory test report
Suitable for
Endurance athletes – runners, cyclists and triathletes
Athletes in a period of competition preparation or intensive training cycles
People in a period of caloric deficit or reduced energy intake
Active individuals with a high training volume looking for an affordable, pure form of glutamine
Realistic expectations matter here. A well-controlled study in young, resistance-trained adults found no significant additional effect of oral glutamine on muscle strength or body composition compared to training alone (Candow et al., 2001), and a comprehensive review by Gleeson (2008) found similar results for glycogen synthesis and the 'anti-catabolic' effect in healthy, well-nourished athletes. Glutamine is therefore better understood as support for recovery and the digestive-immune system in highly loaded athletes rather than as a direct muscle-building agent – for that, sufficient total protein intake and appropriate training remain key.
The manufacturer recommends up to 3 scoops (5 g) per day, i.e. up to 15 g, split around training sessions and meals. This is in line with doses used in research, where acute doses of up to approximately 0.65 g/kg body weight (for a 70 kg person, even up to ~20-30 g) were found to be well tolerated without raising plasma ammonia in healthy individuals (Gleeson, 2008). A risk assessment (Shao and Hathcock, 2008) classifies L-glutamine among amino acids with a favorable safety profile at oral doses. Nevertheless, do not exceed the recommended daily dose on the label, and people with liver disease should consult a doctor before use.
Fermentation is today a standard, well-established method of producing free-form L-glutamine that does not use animal derivatives, making the formula suitable for vegans as well. Since glutamine is a single amino acid, there are – unlike, for example, magnesium with its various salts – no differences between 'forms of the compound'; the key quality criterion is therefore the purity of the free form (100% free-form L-glutamine) and the absence of unnecessary fillers, which this product meets, as the ingredient panel reveals exclusively L-glutamine.
Be cautious here and consult a doctor first. Glutamine is metabolized in the body into glutamate and ammonia, and in people with advanced liver cirrhosis, additional intake can raise serum ammonia and worsen hepatic encephalopathy, which has been documented at doses of 10-20 g in cirrhotic patients (LiverTox / NCBI Bookshelf). For healthy individuals without liver disease, this type of risk has not been documented (Garlick, 2001), but the product label does not carry an explicit warning for this risk group, so caution and medical advice are all the more advisable.
No major allergens listed.
The recommended daily dose on the label must not be exceeded
People with liver disease (e.g. cirrhosis) should consult a doctor before use, as glutamine can affect blood ammonia levels
Ingredients
100% pure fermented L-glutamine.
Form:Powder
Dose:1 scoop (5 g)
Available flavors:Unflavored
L-glutamine:5 g
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