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L-Glutamine is an amino acid crucial for gut health, immune function, and muscle recovery. With numerous options available, selecting the right supplement can be challenging. This guide will help you navigate the key factors to consider for an effective and high-quality L-Glutamine supplement.
In the body, glutamine functions as a major nitrogen transporter and is critical for the maintenance of healthy nitrogen balance*
A conditionally essential amino acid that the body may require more of than it can produce, meaning supplementing with glutamine may help with recovery of the amino acid in the body*
Take 1 capsule 1 to 3 times daily, preferably between meals
Gastrointestinal Health: L-glutamine powder nutritionally supports the mucosal lining and healthy functioning of the gastrointestinal tract*
Supports Lean Muscle: This L-glutamine supplement also helps support and preserve lean muscle mass, especially in times of metabolic stress*
Amino Acid: L-glutamine is the most abundant amino acid in the body; glutamine is utilized by the body for tissue repair and gastrointestinal tract support*
Pure Quality: Our supplements are made with premium ingredients sourced from trusted suppliers and guided by nutritional experts, then carefully manufactured and tested to verify potency and purity
L-Glutamine Powder: Amino acid widely used in post-workout and active-lifestyle routines by lifters and athletes building a personalized supplement stack or custom blends.
Easy-Mixing Unflavored Powder: Fine powder, 5g servings (about 2 tsp), dissolves in water, juice, or shakes for flexible, routine-friendly daily use, measured with a gram scale or scoop.
Pure Single-Ingredient Formula: L-glutamine only, gluten free, with no added flavors, sugars, or fillers, a simple base that pairs easily with creatine, BCAAs, and other supplements.
Made in a cGMP-Compliant Facility: Manufactured in a facility that follows current Good Manufacturing Practices (cGMP) for consistent, carefully produced supplements you can rely on.
L-GLUTAMINE POWERED BY SPORTS RESEARCH : Amino Acids are crucial in the process of building protein within the body. L-Glutamine is one of the most abundant amino acids in the human body—having enough of it aids in your body’s protein synthesis*
WORKOUT RECOVERY, GUT & IMMUNE HEALTH: 1-2 daily scoops of pure L-Glutamine mixed into your favorite beverage, provides you with gut, immune and workout recovery support*
ONE DAILY SCOOP: One to two daily scoops of our fermented glutamine powder, mixed into your favorite beverage, provide you with a range of benefits you can see and feel—especially when combined with a regular workout routine*
DEDICATED TO QUALITY: Our L-Glutamine is made using a proprietary fermentation process, and a high-quality powder from a premium, trusted name made in the USA— entirely vegan, Informed Sport tested for banned substances, gluten-free and non-GMO tested
For Muscle Metabolism & Recovery: MuscleTech Platinum 100% Glutamine powder replenishes what's lost during intense exercise. Glutamine is an essential amino acid that supports metabolic function and recovery. Unflavored. 60 servings.
Ultra-Pure Ingredients: Each serving contains 5g of premium glutamine with no fillers or additives. Platinum 100% Glutamine is odorless, mixes easily on its own, and with no flavor, it seamlessly fits into your supplement routine.
Restore & Replenish Plasma Glutamine: Glutamine makes up over 20% of your body's amino acids and is used in various metabolic functions like energy production. Platinum 100% Glutamine is designed to help replenish what is lost during intense training.
Directions: Take 1 scoop with water or your favorite beverage. Consume 2 servings daily for best results.
NOW Sports products are comprehensively tested so you can trust that our products are pure and effective for every level of athletics
NITROGEN TRANSPORTER*: In the body, glutamine functions as a major nitrogen transporter and is critical for the maintenance of healthy nitrogen balance*
DOUBLE STRENGTH PRODUCT: 2x the L-Glutamine (1,000 mg per capsule) as in our regular strength product (500 mg per capsule)
GMP Quality Assured: NPA A-rated GMP certification means that every aspect of the NOW manufacturing process has been examined, including our laboratory/testing methods (for stability, potency, and product formulation)
Last update on 2026-10-15 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best L-Glutamine Nutritional Supplements
What is L-Glutamine?
L-Glutamine is the most abundant amino acid in the body, playing a vital role in protein synthesis, immune cell function, and maintaining the integrity of the intestinal lining. It's considered a conditionally essential amino acid, meaning the body may need more of it during times of stress or illness.
Benefits of L-Glutamine Supplements
Gut Health: Supports the intestinal lining, aiding in the repair of damaged gut tissue and potentially alleviating symptoms of digestive disorders.
Immune Support: Provides fuel for immune cells, helping to bolster the body's defense system, especially during periods of physical stress.
Muscle Recovery: May aid in reducing muscle soreness and improving recovery after strenuous exercise by replenishing muscle glutamine stores.
Nutrient Absorption: A healthy gut lining is essential for efficient nutrient absorption.
Key Factors to Consider
Purity: Look for supplements that are 100% pure L-Glutamine with minimal additives or fillers. Certifications like NSF Certified for Sport or USP ensure third-party testing for purity and potency.
Form: L-Glutamine is typically available in powder or capsule form. Powders offer flexibility in dosage and can be mixed into beverages, while capsules provide convenience.
Source: While most L-Glutamine is synthetically produced or derived from animal sources, vegetarian or vegan sources are also available.
Dosage: Typical daily dosages range from 5 to 15 grams, often split throughout the day. Consult with a healthcare professional for personalized recommendations.
Comparison Tips
Read Labels Carefully: Pay attention to the serving size, ingredient list, and any third-party certifications.
Check for Allergens: Ensure the product is free from common allergens if you have sensitivities.
Consider Your Goals: If your primary focus is gut health, look for products with transparent sourcing and purity standards. For athletic performance, certifications related to sports may be beneficial.
Frequently Asked Questions
Who might benefit from taking L-Glutamine?
Individuals experiencing digestive issues, those recovering from illness or surgery, athletes looking to support muscle recovery, or people undergoing significant physical stress may find L-Glutamine beneficial. However, it's always best to consult a healthcare provider.
Is L-Glutamine safe for everyone?
For most healthy adults, L-Glutamine is generally safe when taken as directed. However, individuals with certain medical conditions, such as kidney or liver disease, should consult their doctor before use.
What is the best time to take L-Glutamine?
The optimal timing can vary depending on individual goals. Some prefer taking it on an empty stomach, especially in the morning or before bed, while athletes might take it post-workout to aid recovery. Splitting doses throughout the day is also common.
How long does it take to see results from L-Glutamine?
The timeframe for experiencing benefits can differ significantly from person to person. Some may notice improvements in digestive comfort or recovery within a few weeks, while others might require longer use to observe noticeable effects.
Can L-Glutamine interact with medications?
While generally considered safe, L-Glutamine could potentially interact with certain medications. It's advisable to discuss your supplement regimen with your doctor or pharmacist to avoid any adverse interactions.
What's the difference between L-Glutamine and glutamine peptides?
L-Glutamine is the free-form amino acid, while glutamine peptides are chains of amino acids including glutamine. Some believe peptides are more stable and better absorbed, though research is ongoing. Both aim to provide glutamine to the body.
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