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Doctor's Best Pure L-Glutamine Powder, Supports Muscle Mass, Strength and Post-Workout Recovery, 300g



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From the manufacturer

Doctor’s Best Pure L-Glutamine Powder contains L-Glutamine, an amino acid that is a building block of protein. L-Glutamine is most commonly used to support muscle growth, skeletal muscles and athletic endurance. Supplementing with L-Glutamine allows the body the much-needed amino acids to increase muscle hydration. This is an essential process in the body that supports muscle recovery from high intensity workouts.*

L-G lutamine has an important role in maintaining muscle growth and health in both children and adults.* L-Glutamine is also the most abundant free amino acid in the body. It is synthesized mainly in the skeletal muscle, liver, and lungs and has an important role in energy production, being the major fuel source for the liver, the intestines, and immune system. L-Glutamine is an essential amino acid in critical states (stress, intense physical activities, injuries, illness) when the body’s need for glutamine exceeds its own capacity to produce sufficient amounts. Biological, pharmaceutical and safety aspects of L-Glutamine have been well studied. Based on research and many clinical studies, L-Glutamine has become widely known and used for its ergogenic capabilities, improving physical performance, stamina, and recovery after intense exercise among athletes. L-Glutamine supplements is also very popular among the general population and athletes for its role in immune health and exercise.*

Extended benefit - Helps Promote Muscle Growth and Athletic Performance* - L-Glutamine is considered as one of the most important amino acid involved as a building block of protein, promoting muscle growth. L-Glutamine is therefore very popular among athletes who undergo heavy workouts. Many studies highlighted the importance of L-Glutamine supplementation in stimulating anabolic functions such as protein synthesis, cell growth and differentiation, and inhibiting catabolic functions such as protein degradation. Individuals who engage in intense physical activities have an increased need of L-Glutamine to restore its levels to normal to avoid loss of muscle mass and preserve other biological functions. Therefore, L- Glutamine supplementation may promote muscle growth and support athletic performance.*

May Help With Recovery of Muscle Strength and Reduce Muscle Soreness After Physical Exercise* - Any intense exercise can lead to muscle damage. Various clinical studies showed the importance of L-Glutamine supplementation on the recovery of muscle strength after heavy workouts. Being the central free amino acid in the body, L-Glutamine is vital to muscle function. Research has demonstrated L-Glutamine plasma level could greatly be reduced during post-exercise recovery period. This decline, if not corrected, lead to acidosis and muscle soreness. Studies showed the positive effects of L- Glutamine supplementation on muscle strength recovery and muscle soreness reduction after intense exercises.*

* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.

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Shipping & Returns

Domestic Shipping

Delivery occurs 6 to 10 business days after processing ends, pending availability and credit card verification. Processing the order can take up to 10 business days. Please allow additional processing time during promotional events. Ground delivery to Hawaii and parts of Alaska may take more than 8 business days. 


Luxotia will contact you with a follow-up email if the merchandise you have selected is not available at the time of order processing.

You will be fully charged for any item ordered, the moment you placed the order. The charge is an automatic process. If you change your mind since the order ships, we will issue a full refund without any fine or any kind of tax.

You will be contacted by e-mail with a tracking number when your order leaves our distribution center.

Please note that items are not guaranteed in stock due to orders being filled from multiple locations. If we are unable to complete your order, you will be notified via email as soon as possible.

We are responsible for your new purchase until it reaches the Post Office.

In the case that your shipment is lost or damaged in transit, you are responsible to file the claim with USPS / UPS or any other shipping carrier. We are not responsible for lost packages during transit or shipments sent to forwarding services or companies, regardless of the shipping service selected. If you place an order and your shipping address is a forwarding address, you are responsible for contacting your forwarding company or service to locate your shipment.

We are not responsible to weather related damage or delays. 

We cannot ship to Post Office Boxes.

We cannot ship to US territories including American Samoa, Baker Island, Federated States of Micronesia, Guam, Howland Island, Jarvis Island, Johnston Atoll, Kingman Reef, Commonwealth of the Northern Mariana Islands, Midway Islands, Navassa Island, Palmyra Atoll, Puerto Rico, U.S. Virgin Islands, and Wake Island.

Return Policy

If a purchase was made on or after 2/15, customers will be able to return to stores for 30 days after stores reopen.

At Luxotia, we want you to be pleased with your purchase. If for any reason you are not completely satisfied, you may return or exchange your purchase when it is presented with established proof of purchase in saleable condition. Simply follow the guidelines below:

Returns are eligible for a full refund if returned within 30 days with a receipt.Unfortunately, we cannot exchange, replace or credit gourmet, monogrammed or personalized items.We recognize that returns are important to our customers. To ensure a positive shopping experience for all our customers, if we identify an unreasonable return pattern, we may restrict or refuse future transactions from such customers.For all returns, merchandise must be presented in saleable condition and established proof of purchase is required.How to Make a Return

To start your return you will need to find your order number in one of these locations below:

Top right corner of your packing slipSubject line of your shipping account - Order History


Pack your return securely, in the original package, if possible, and include your printed invoice.Contact us at to issue a packing slip (return slip)Affix your shipping label to the package, making sure no other tracking labels are showing.


When your package is ready, you can ship it via FedEx or the U.S. Postal Service

For FedEx, drop it off at your nearest FedEx location.For the U.S. Postal Service, give it to your mail carrier or drop it off at your nearest post office.


Click on the "track Your Return" button in your return confirmation email to track the status of your return. Please allow 10-14 business days for the processing of your return by mail.

Refunds in the form of original payment can take up to 3 weeks to be credited back to your account



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Doctor's Best Pure L-Glutamine Powder, Supports Muscle Mass, Strength and Post-Workout Recovery, 300g

Doctor's Best Pure L-Glutamine Powder, Supports Muscle Mass, Strength and Post-Workout Recovery, 300g