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Dietary supplement

Free Form Glutamine Unflavored Ingredients & Drug Interactions

by Muscle Feast

Free Form Glutamine Unflavored label
See full label image
Powder Category: Amino Acid/protein
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 16, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Free Form Glutamine Unflavored against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.

Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy

The interaction bottom line Most serious interaction: Moderate

Free Form Glutamine Unflavored is a dietary supplement by Muscle Feast with 1 active ingredient. Its ingredients are commonly taken for muscle recovery and sports performance, gut health and 'leaky gut', recovery from severe illness or injury.Based on those ingredients, 50 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are L-Glutamine. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against Free Form Glutamine Unflavored by Muscle Feast

Ask about any prescription or over-the-counter medication and we check it for interactions with Free Form Glutamine Unflavored by Muscle Feast — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Free Form Glutamine Unflavored by Muscle Feast

Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.

From our pharmacy team — supplement deep dive

Generated from HelloPharmacist’s pharmacist-curated databases and editorial rules · Last generated Jul 30, 2026

What’s inside

Full disclosure
Ingredient Transparency · database check
Full

Every active ingredient lists its own amount on the label.

Why this rating?
  • The label discloses an exact amount for 1 of its 1 active ingredient.
  • No proprietary blends here — you can verify the dose of every single component.

This product contains one active ingredient: L-Glutamine, an amino acid your body makes naturally and uses for gut health, immune support, and muscle recovery. It comes as an unflavored powder, so you can mix it into drinks or food.

The only other ingredient listed is lecithin, an inactive ingredient used in the formulation.

Does it work?

Moderate evidence
Evidence for Intended Use · database check
By FDA rules, dietary supplements can’t claim to treat, cure, or prevent disease — so labels speak in careful marketing language. We discern each product’s intended use from its name, label claims, and label statements, then grade the clinical evidence for that use. How these ratings are computed
Moderate

Some clinical evidence supports this product's ingredients for its stated purpose, but it isn't conclusive.

Why this rating?
  • The label markets this product for: muscle recovery and athletic performance.
  • We looked for evidence on: Athletic performance, Exercise-induced muscle damage, Postoperative recovery, muscle protein synthesis, amino acid supplementation.
  • The strongest evidence on file: Glutamine is rated "Possibly Effective" for Postoperative recovery (Natural Medicines).
  • Also on file: Glutamine is rated "Possibly Ineffective" for Athletic performance.
  • Also on file: Glutamine is rated "Insufficient Reliable Evidence To Rate" for Exercise-induced muscle damage.

The evidence supports L-Glutamine as effective for sickle cell disease. The data also shows it's possibly effective for HIV/AIDS-related wasting, recovery after surgery, and critical illness from trauma.

Keep in mind that 'possibly effective' means the evidence exists but isn't as robust as 'effective' — your results may vary depending on your individual situation and how you're using it.

The evidence, ingredient by ingredient Glutamine

How safe is it?

Well-documented data
Safety Information · database check
Well characterized

Adverse-effect, pregnancy, and general safety data are on file for most of these ingredients.

Why this rating?
  • We hold adverse-effect (side-effect) data for 1 of the 1 matched ingredient.
  • Pregnancy & breastfeeding safety ratings cover 1 of 1.
  • General safety write-ups exist for 1 of 1.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

L-Glutamine is generally well tolerated by healthy adults. Common side effects from oral use include belching, bloating, constipation, diarrhea, flatulence, nausea, vomiting, headache, and gastrointestinal pain — especially at higher doses (10–30 grams daily).

Dizziness and headache have also been reported, though one person found symptoms improved by lowering the dose. If you have kidney or liver disease, use it only under medical supervision.

Pregnancy and lactation data rates it as likely safe, but because there isn't enough reliable safety information for supplemental doses while breastfeeding, talk with your doctor or pharmacist before taking it during that time.

Side effects, ingredient by ingredient Glutamine

Meds to double-check

Moderate interaction found
Known Interaction Concern · database check
Moderate identified

The most serious documented interaction for these ingredients is Moderate. Check your medications for a personalized result.

Why this rating?
  • 1 of the 1 matched ingredient can interact with medications — Glutamine.
  • The most serious interaction on file is rated Moderate.
  • Some involve high-stakes drug classes: seizure medications.
  • For scale: 50 individual medications appear in the full list. A big number alone doesn't make a product dangerous — what matters is whether YOUR medication is on it, so run yours through the interaction checker on this page.

If you take anticonvulsant (seizure) medications, double-check with your doctor or pharmacist before using this product — L-Glutamine might theoretically reduce how well they work, though this hasn't been reported in humans. Run all your other medications through the interaction checker on this page as well, since the data indicates potential interactions across many drug types overall.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFully disclosed formula with some supporting evidence for its stated purpose. Moderate medication interactions have been identified, and safety information is well characterized.

Free Form Glutamine may help with sickle cell disease, HIV/AIDS wasting, surgery recovery, or critical illness — but the evidence is strongest for sickle cell disease. If you take anticonvulsants (seizure medications), you'll want to confirm with your doctor or pharmacist before adding this supplement.

Healthy people usually tolerate it well, though digestive side effects are common, especially at higher doses. Because the data shows interactions spanning 50 medications, check your exact prescriptions with the tool on this page before you start.

Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI

Assessment coverage: 1 of 1 active ingredient matched to our full ingredient reviews (monographs). Based on the product label dated Feb 23, 2022.

This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed

At a glance

General information

Key facts about Free Form Glutamine Unflavored, straight from the product label.

Brand Muscle Feast
Net contents 7 Ounce(s); 200 Gram(s)
Market status On market
Date entered into DSLD Feb 23, 2022
DSLD ID 259916
Product type Amino Acid/protein
Supplement form Powder
Dietary claims / uses Nutrient, All Other, Structure/Function
Intended target group(s) Vegan, Vegetarian, Adult (18 - 50 Years), Women (not pregnant or lactating)
From the label
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.

Supplement Facts

The label details for Free Form Glutamine Unflavored by Muscle Feast, sourced from the NIH Dietary Supplement Label Database.

Supplement Facts

Daily Value (DV) Target Group(s):
Adults and children 4 or more years of age
Minimum serving Sizes:
6 Gram(s)
Maximum serving Sizes:
6 Gram(s)
Servings per container
33
IngredientAmount% DV
L-Glutamine6000 mg--

Other ingredients: Lecithin

Tap any ingredient to jump to its full detail below.

Label statements
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
Formula

Glutamine is considered to be the most abundant amino acid in the body. While the body can make enough glutamine for its regular needs; physical stress from extreme exercise can demand more glutamine than what the body can produce on its own. Because it's in such high demand, it's important to supplement with glutamine. In addition to being essential to the body's gut and immune system, it makes up 60% of the free-form amino acids floating in skeletal muscles. Furthermore, it plays a very important role in protein metabolism, making it an essential choice for athletes.

Furthermore, it plays a very important role in protein metabolism, making it an essential choice for athletes.

6000 mg per serving / pharmaceutical grade

Suggested/Recommended/Usage/Directions

Suggested use: As an adult dietary supplement, take one serving (6 g) in 6-8 oz. of water or flavored beverage, 2-3 times per day or as needed. Mix 1 level (6 g) scoop with 8 oz. water or beverage of choice.

Seals/Symbols

Made in an FDA Registered Facility GMP Good Manufacturing Practice Certified Vegan AVA American Vegetarian Association

General Statements

SDVOSB Service Disabled Veteran Owned Small Business

Ohio family owned business

FDA Statement of Identity

Dietary Supplement

Storage

Keep tightly closed in a cool, dry place away from sunlight.

Precautions

Keep out of reach of children.

Do not exceed the recommended dose. Consult your physician before using this product.

Do not use this product if you are pregnant or nursing. Do not use this product if you are taking any prescription medication.

Do not use this product if you are under the age of 18.

Warning: This product is manufactured in a GMP compliant plant that processes milk.

FDA Disclaimer Statement

This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Formulation

Certified Vegan AVA American Vegetarian Association

Is this label outdated? Report a formula or label change and our pharmacy team will review it.

See for yourself

Free Form Glutamine Unflavored by Muscle Feast label

The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.

Free Form Glutamine Unflavored label

Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.

View the full label (PDF)
What’s inside

The Ingredients in Free Form Glutamine Unflavored by Muscle Feast

This is the 1 active ingredient this product is made of. Select it to open its full monograph.

Serving size6 Gram(s) Dosage formPowder Servings per container33 Amounts shown are per serving.

L-Glutamine

Interacts with
50 drugs
6000 mg per serving

Glutamine is the most abundant amino acid in the body and is usually made in your muscles. A prescription form is FDA-approved to help reduce sickle c...

L-Glutamine monograph & interactions

Other (inactive) ingredients: Lecithin. These complete the product’s ingredient list but are not active constituents.

Interaction report

Free Form Glutamine Unflavored by Muscle Feast Drug Interactions

Want to check YOUR meds against Free Form Glutamine Unflavored?

Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.

 Go to the checker
50Drugs
50 Moderate

Ingredients driving the most interactions

L-Glutamine 50

Individual Drug Interactions

The ingredients in Free Form Glutamine Unflavored interact with 50 drugs. Click any drug to see the details.

1 of the 1 ingredient in Free Form Glutamine Unflavored interact with drugs. Each result below shows which ingredient is responsible. L-Glutamine

Each ingredient & the kinds of drugs it affects

For each ingredient in Free Form Glutamine Unflavored with known interactions, here are the types of medications it can affect. Open any type for the detail — or search your exact drug in the checker above.

L-Glutamine1 drug type · 50 drugs

Anticonvulsants

Theoretically, glutamine might antagonize the effects of anticonvulsant medications.
Glutamine is metabolized to the excitatory neurotransmitter glutamate. Glutamate might have antagonistic effects with anticonvulsant drugs. However, this interaction has not yet been reported in humans.

Likelihood Possible Evidence D
L-Glutamine full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Free Form Glutamine Unflavored, from the product label.

Muscle Feast

See all Muscle Feast products
Name
Muscle Feast
Street Address
1320 Boston Road
City
Nashport
State
OH
ZipCode
43830
Phone Number
(888) 734-3634
Web Address
www.musclefeast.com
Pharmacist Counseling Corner

Free Form Glutamine Unflavored by Muscle Feast: Common Questions

Does Free Form Glutamine Unflavored by Muscle Feast interact with any medications?
Yes. Based on its ingredients, Free Form Glutamine Unflavored has a known interaction with 50 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Free Form Glutamine Unflavored contains a single active ingredient, and that one ingredient can interact with many different medications on its own. We check it against each medication and show the mechanism responsible.
Where does this information come from?
The product label data comes from the NIH Dietary Supplement Label Database (DSLD); the interaction data is built on the Natural Medicines database and reviewed by HelloPharmacist pharmacists.
Will this help my athletic performance or muscle recovery?
The product facts we have don't cover athletic or muscle performance. The evidence on file supports L-Glutamine for sickle cell disease, post-surgery recovery, and wasting conditions related to HIV/AIDS and critical illness. For sports or general muscle building, your doctor or a sports nutritionist would be the right person to ask.
What side effects should I expect?
The most common ones are digestive: belching, bloating, constipation, diarrhea, flatulence, and nausea. Headache and gastrointestinal pain have also been reported. Higher doses (10–30 grams daily) are more likely to trigger these. If you experience dizziness or headache, reducing your dose may help.
Is it safe to take while pregnant?
Yes — the data rates L-Glutamine as likely safe during pregnancy. However, if you're pregnant, it's still a good idea to mention any supplement to your doctor so they have the full picture of what you're taking.
Can I take it while breastfeeding?
There isn't enough reliable safety data for supplemental doses while breastfeeding, so the recommendation is to avoid it unless your doctor advises otherwise. Talk with your doctor or pharmacist about whether it's right for you during this time.
Why does the label mention 50 medication interactions if there's only one drug type listed?
The single interaction category we document — anticonvulsants — actually covers 50 individual seizure medications. That's why the number is higher than the number of drug categories you see described here.
Is this safe if I have kidney or liver disease?
The data advises that people with kidney or liver disease should use L-Glutamine only under medical supervision. Talk with your doctor before starting it if either applies to you.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Not sure if Free Form Glutamine Unflavored is safe with your meds?

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Ask a pharmacist

Label information is sourced from the NIH Dietary Supplement Label Database and reflects the product version on file; always read your actual product label. This page is for education only and is not a substitute for professional medical advice. Confirm with your pharmacist or doctor before combining supplements and medications.

Free Form Glutamine Unflavored label
Go deeper

The Full Monographs Behind Free Form Glutamine Unflavored’s Ingredients

Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.

Herb & supplement monograph

Glutamine

Interacts with 50 drugs

Glutamine is the most abundant amino acid in the body and is usually made in your muscles. A prescription form is FDA-approved to help reduce sickle cell disease complications, but for most...

Read the full Glutamine monograph →
Sources

Sources & How We Checked

Free Form Glutamine Unflavored's label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

The 11 references behind this product’s interaction data

Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.

Glutamine 11 references
  1. Miller AL. Therapeutic considerations of L-glutamine: a review of the literature. Altern Med Rev 1999;4:239-48..
  2. Bozzetti F, Biganzoli L, Gavazzi C, et al. Glutamine supplementation in cancer patients receiving chemotherapy: a double-blind randomized study. Nutrition 1997;13:748-51.. PubMed
  3. Mebane AH. L-Glutamine and mania. Am J Psychiatry 984;141:1302-3.
  4. Meldrum BS. Glutamate as a neurotransmitter in the brain: review of physiology and pathology. J Nutr 2000;130:1007S-15S.. PubMed
  5. Garlick PJ. Assessment of the safety of glutamine and other amino acids. J Nutr 2001;131:2556S-61S.. PubMed
  6. Chapman AG. Glutamate and epilepsy. J Nutr 2000;130:1043S-5S.. PubMed
  7. Ziegler TR. Glutamine supplementation in cancer patients receiving bone marrow transplantation and high dose chemotherapy. J Nutr 2001;131:2578S-84S.. PubMed
  8. Laviano A, Molfino A, Lacaria MT, Canelli A, De Leo S, Preziosa I, Rossi Fanelli F. Glutamine supplementation favors weight loss in nondieting obese female patients. A pilot study. Eur J Clin Nutr. 2014 Nov;68(11):1264-6. PubMed
  9. Endari (l-glutamine) [package insert]. Torrance, CA: Emmaus Medical,Inc; 2017.
  10. Niihara Y, Miller ST, Kanter J, et al. A Phase 3 Trial of l-Glutamine in Sickle Cell Disease. N Engl J Med 2018;379(3):226-35. doi: 10.1056/NEJMoa1715971.
  11. Ogden HB, Child RB, Fallowfield JL, et al. Gastrointestinal Tolerance of Low, Medium and High Dose Acute Oral l-Glutamine Supplementation in Healthy Adults: A Pilot Study. Nutrients. 2020;12(10):2953. PubMed

See these in context on the Glutamine monograph →

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

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