Home » Reviews » Amino Acids » L Glutamine Review

L Glutamine Review – 8 Things You May Not Know

By Sasha de Beausset Aparicio, MSc

Reviewed by Rebecca Williams, MD, MA, MB, BChir

Last Updated:

Evidence Based | Synopsis | What's Inside? | Claims | Cautions | Price | Suggested Use | Does it Work

L Glutamine is an amino acid that is naturally found in the human body. It is not considered to be inherently essential to the human body, but it can become one in situations that require extended effort or when the gastrointestinal system is facing issues.

This product claims to improve the body’s metabolism, strengthen the immune system, improve focus capacity and even fasten the liver’s recovery rate. While not all of these claims are medically proven, the supplement is still very popular, particularly among people performing sports. Many companies are currently manufacturing this product, either as a stand-alone supplement or as a compound with other substances meant to improve the body’s general condition.

Sports enthusiasts, professional athletes and people trying to lose weight are sure to appreciate L Glutamine, due to the accelerating effect it has on metabolism. People that suffer from gastrointestinal issues can also benefit from the intake of this amino acid, as it keeps the intestinal lining healthy.


1) L Glutamine at a Glance

The active ingredient in L Glutamine is Glutamine, one of the 20 amino-acids that are naturally encoded by the standard genetic code. This substance has undergone research for the past 10-15 years, with conclusive result regarding its positive effects on the human body.

A supplement of choice for bodybuilders and weightlifters, Glutamine aids the body in moving nitrogen to where it is most needed, rushing metabolism and increasing energy levels. This effect proves useful for people practicing sports, as well as individuals that need an extra boost in their daily activities.

Another medically attested use for Glutamine is in postoperative patients. The supplement has consistently shown to be useful in recovering from injuries, trauma, and particularly helpful in people recovering from treatment-related side-effects of cancer or that have undergone abdominal surgery.

There is a large amount of debate regarding the effect of Glutamine on the liver; while it is generally considered to improve the liver’s regenerative capacity, there has been some evidence that it might actually prove harmful to people already suffering from liver disease.

Aside from liver conditions, there are no reported negative interactions for this product. It is considered safe for everyone regardless of age or gender, but caution is still advised. If you begin experiencing any undesired effects, discontinue the use of the supplement and consult a doctor.

What’s Inside?

2) What’s Inside L Glutamine?

L Glutamine contains: L-Glutamine (Free-Form), Cellulose and Stearic Acid (vegetable source). Vegetarian Formula.

3) What Does L Glutamine Do?

Out of L Glutamine’s many uses, the main one is that this amino acid is responsible for moving nitrogen around in the body to the locations that need it. L-Glutamine supplements are claimed to help the body increase energy levels, to provide more stamina, and to help aid with the recovery process from various health concerns. It is also claimed to be a way to keep the mind functioning well with additional focus and alertness.

There are many reports that L-Glutamine can boost the immune system and regenerate faster from other health problems. One of the reasons a person might want to take this amino-acid is that it supposedly lowers stress levels and repair damaged cells simultaneously. Notorious coffee or alcohol drinkers, as well as smokers, will feel at ease because L-Glutamine provides a faster rate of recovery for the liver.

The debate continues though about how effective L-Glutamine supplements are. Some experts believe that they aren’t nearly as effective as what the body can produce on its own, while others deny such statements. The value of the product depends on each. Dosage varies from person to person, but you should never take more than the product says you should. Any health warnings are also listed on the package.


4) L Glutamine Claims

  • natural product.
  • suitable for vegetarians.
  • product has undergone extensive research and has proven effects.
  • no reports of side effects on healthy individuals.
  • affordable supplement, on average less than 10$ for a month’s supply.


5) What You Need to Know Before Taking L Glutamine

  • can prove harmful to people suffering from liver conditions.
  • large amount of debate regarding whether the product is as efficient as it claims.


6) L Glutamine Price

As mentioned earlier, the brand name and manufacturer tend to influence the price considerably. The number of pills you take per day takes a toll on the overall value of the product. Hence some may take up to four of them in a 24-hour interval.

L-Glutamine is not hard to find on the market, as it is found both online and at local retailers and can be used right away. If you take your time, you might find yourself saving a lot of money comparing each offer, the vast majority of producers are found online.

Suggested Use

7) Suggested Use

The recommended dose is up to 4 pills per day, but it strongly depends on the reasons for ingestion: some people might need an immediate boost of energy for sports activities, while some might need a constant supply to aid with injury recovery. Therefore, we recommend you conduct your own research before deciding on a dose.

Does it Work

8) Bottom Line – Does It Really Work?

The large amount of debate surrounding L Glutamine could discourage potential customers from trying this product, however the large amount of companies manufacturing and selling the supplement, as well as the vast array of testimonials praising its effects suggest that the product claims might be valid.

People using L Glutamine to acquire their desired body shape might find themselves tempted to go above the recommended daily dose in order to fasten the effects. This is strongly discouraged, as there is little documentation on the effects of overdosing on this supplement.

Before making a purchase decision for L Glutamine we advise you conduct your own research into manufacturers, return policies, as well as consult your medic about possible interactions with any medication you might be currently taking.

3.4/5 - (5 votes)
Notify of
Inline Feedbacks
View all comments
Valerie Robbins

Helping the dizziness. I am very active at work so I get tired very easily. Milk, cheese, and L-glutamine.


take one 500 mg capsule once per day and it helps to strengthen the lining of my gut and is supposed to help boost your immune system as well.