L-Glutamine Powder

Thorne L-Glutamine Powder delivers the body's most prevalent bloodstream amino acid in NSF Certified for Sport® form — supporting gastrointestinal health, immune function, and the restoration of plasma glutamine levels that intense or prolonged exercise can deplete.

Thorne's L-Glutamine Powder is NSF Certified for Sport®. Evidence suggests supplemental L-glutamine benefits gastrointestinal health, supports wound healing, maintains immune health, and helps restore plasma glutamine levels depleted after periods of physical stress, such as prolonged exhaustive exercise.* L-glutamine is the most prevalent amino acid in the bloodstream. It is found in high concentration in the gastrointestinal tract, which is its greatest user. Various stress factors – such as trauma, infection, malnutrition, chemotherapy, injury, and high-level athletic training – can adversely affect absorption in the small intestine, leading to food allergies. 

Skeletal muscles contain the greatest intracellular concentration of L-glutamine. But that concentration can be adversely affected by various insults, including injury, infection, chronic stress, malnutrition, and glucocorticoid use. Intense exercise lowers blood levels of glutamine, which can remain low if intense training is repeated without adequate recovery. Research indicates L-glutamine supplementation can offset these conditions.*

Because an athlete needs to know that his or her supplements are trustworthy and compliant, every batch of an NSF Certified for Sport® product is tested for compliance with label claims and to ensure the absence of more than 200 substances banned by many major athletic organizations, including stimulants, narcotics, steroids, diuretics, beta-2 agonists, and masking agents.

Suggested Use:

Mix 1 scoop with at least 8 ounces of water, juice, or preferred beverage daily or as recommended by your health-care practitioner.

Warnings:

ALLERGY WARNING

This product is contraindicated in an individual with a history of hypersensitivity to any of its ingredients.

PREGNANCY

If pregnant, consult your health-care practitioner before using this product.

INTERACTIONS

There are no known adverse interactions or contraindications at publication date.

When L-Glutamine Powder Fits Your Routine

• Post-training recovery: Intense exercise can lower circulating glutamine levels; this powder is formulated to help restore them during high-demand training blocks.
• Gut health support: L-glutamine is found in high concentration in the gastrointestinal tract, making it a go-to amino acid for those prioritizing digestive wellness alongside their fitness routine.
• Immune maintenance: Periods of physical stress can challenge immune health; supplementing with L-glutamine is a way to help maintain normal immune function during those windows.
• Certified sport nutrition: The NSF Certified for Sport® credential means the formula is third-party tested for banned substances — a meaningful standard for competitive athletes and discerning consumers alike.

Frequently Asked Questions

What is Thorne L-Glutamine Powder used for?

Thorne L-Glutamine Powder is used to support gastrointestinal health, immune function, and the restoration of plasma glutamine levels that can be depleted by prolonged or intense exercise. It is intended as part of a broader nutrition and recovery routine.

Is Thorne L-Glutamine Powder safe for competitive athletes?

Yes — this product carries the NSF Certified for Sport® certification, meaning it has been independently tested to verify it is free from substances banned in sport. It is one of the most recognized quality marks in athletic supplementation.

Why is L-glutamine relevant for people who train hard?

Intense or repeated exercise can lower blood glutamine levels, which may remain depleted without adequate recovery. Evidence suggests that supplemental L-glutamine can help offset this depletion and support the body during periods of physical stress.