Thursday, 23 May 2024


MET-Rx L-Glutamine Powder Supplement Review

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MET-Rx L-Glutamine Powder is designed to supplement your body’s natural production of glutamine, which is one of the key amino acids used in protein biosynthesis.

But how does the MET-Rx version compare to other top rated glutamine supplements from companies such as Bulk Supplements, MuscleTech, and AMRAP Nutrition?

In this review we’ll consider the benefits of choosing the MET-Rx glutamine powder over glutamine tablets, recommended dosages, whether a ‘loading’ phase is necessary, and how it compares to other bestselling glutamine supplements in terms of value for money.

We’ll also provide recommendations on the best way to combine this product in a supplement stack for specific training goals. This will help guarantee you get the best results from your fitness or bodybuilding program, even on a limited budget.

MET-Rx L-Glutamine Ingredients

MET-Rx L-Glutamine Ingredients

With 6 grams per serving, MET-Rx has the highest dose we’ve seen in an L-glutamine supplement. But what does this mean in terms of value for money?

At the time of writing this review it was one of the most expensive glutamine products on the market, with a cost per gram that was higher than MuscleTech, MusclePharm, and Optimum Nutrition.

Bodybuilders will typically take 2-3 of these 6 gram servings throughout the day, with 1 dose in the morning, 1 dose post-workout, and 1 at night before sleep. Although glutamine is perfectly safe, it’s a good idea not to go much above 10 to 15 grams per day.

What results can I expect?

There’s no shortage of information about the health benefits of glutamine. The tough part is being able to tell the difference between what’s true and what’s not.

A common misconception is that glutamine supplementation boosts muscle recovery post-workout. But there’s no scientific evidence to prove this is the case.

One study found that perceived muscle soreness was significantly lower 96 hours after a workout compared to a control group. Unfortunately the sample size was small and unvaried, with just 15 physically active males split between the two groups.

However, glutamine has proven its importance as a nutrient for healing Leaky Gut Syndrome (LGS), as it supports the recovery of intestinal barrier function. Further studies have highlighted glutamine’s ability to lower levels of intestinal permeability.

If you’re looking for an all-in-one BCAA powder that also includes a healthy 3 g dose of L-glutamine, we recommend Scivation Xtend. Not only does it contain glutamine, it also uses the highly effective 2:1:1 ratio of branched chain aminos.

MET-Rx L-Glutamine Powder Supplement

MET-Rx L-Glutamine – Product Summary

  • Utilized as cellular fuel, especially in muscles, and supports protein metabolism
  • Promotes bicarbonate production, which can be important for buffering lactic acid produced during intense exercise
  • Includes 1,000 grams of L-Glutamine Powder per serving

Health benefits of MET-Rx L-Glutamine

For a comprehensive list of glutamine health benefits, we recommend taking a look at our Glutamine Buying Guide.

When is the best time to take it?

Recommended use

Mix 6 grams into 8 to 12 oz. of fluid and drink immediately after exercise on workout days, or as directed by your qualified healthcare professional.

MET-Rx Glutamine vs. AMRAP Glutamine

MET-Rx Glutamine
AMRAP Glutamine
Glutamine: 6 g
Glutamine: 5 g
Serving size: 6 g
Serving size: 5 g
Container size: 400 g
Container size: 200 g
Cost per serving: $0.39
Cost per serving: $0.83

MET-Rx Glutamine vs. Bulk Supplements

MET-Rx Glutamine
Bulk Supplements Glutamine
Glutamine: 6 g
Glutamine: 1 g
Serving size: 6 g
Serving size: 1 g
Container size: 400 g
Container size: 1000 g
Cost per serving: $0.39
Cost per serving: $0.03

What sizes are available?

With a serving size of 6 g and a product weight of 400 g, each tub provides you with approximately 167 servings.

Save money with Amazon

If you’re looking to save money on your monthly supplement order, you might want to consider the Amazon Subscribe & Save program.

Subscribe & Save allows you to unlock savings of up to 15% on a wide range of sports nutrition products, including MET-Rx L-Glutamine Powder.

You can save 5% with a subscription to 1 product, or save the full 15% by subscribing to 5 products, provided they’re all delivered to the same address. The delivery schedule can be set from monthly, up to once every 6 months.

Although 5 products might sound a lot, if you already supplement with a protein powder, multivitamin, creatine, BCAA, and glutamine, the savings can soon add up. But it’s best to order before you run out of your current supplements, because Amazon set the day of the month each order is sent (usually around the 14th).

Who are MET-Rx?

MET-Rx has been a market leader in sports nutrition for over 20 years. Their reputation has been built on delivering high quality supplements, such as protein bars, RTDs, protein powders, multivitamins, amino acids, and creatine.

Some of the current bestsellers include Natural Whey Protein Powder, Creatine 4200, and the MET-Rx Protein Plus bar, each of which has over 500 highly rated reviews on Amazon.

MET-Rx is also well known for its meal replacement powders (MRPs). The first version required you to mix powder from two canisters; one labelled ‘base’ and their other ‘plus’. This was later released as a single product, where the micellar casein component was removed.

Today, the MET-Rx meal replacement powder remains one of their most popular supplements. Each serving contains 3 g of L-Glutamine, 38 g of Metamyosyn protein, and more than 6 g of BCAAs.

Glutamine Supplement Buying Guide

Review Overview

Overall Review Rating

5 / 5

MET-Rx Glutamine offers excellent value for money. During our review we found the cost per serving was actually cheaper than Optimum Nutrition, MusclePharm, and MuscleTech, even though you get 20% more glutamine (6 g per serving instead of 5 g).

You can also save around $0.10 per serving by choosing the larger 1 kg tub over the 400 g tub.

The great thing about having MET-Rx Glutamine as a powder instead of capsules is you can control your intake. This is perfect for anyone taking a protein powder that already contains L-glutamine, such as MET-Rx’s own Protein Plus (3 g glutamine in every 2-scoop serving).

Overall, you’ll struggle to find a cheaper glutamine supplement than this. As a sports nutrition company with over 20 years of research, MET-Rx has earned the trust of thousands of customers through their development of high quality supplements such as this.

For added peace of mind, MET-Rx is backed by parent company NBTY, who owns a number of other supplement companies, and has over 16,000 products in their portfolio.

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