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Dietary supplement

L-Glutamine Unflavored Ingredients & Drug Interactions

by About Time

Powder Category: Amino Acid/protein
Most serious interaction: Moderate
The interaction bottom line Most serious interaction: Moderate

L-Glutamine Unflavored is a dietary supplement by About Time 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.

HelloPharmacist Scorecard of L-Glutamine Unflavored by About Time

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

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 naturally produces and uses for immune function, gut health, and muscle recovery. The powder form lets you mix it into drinks or food at your preferred dose.

There are no inactive ingredients listed.

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 immune and gut health.
  • We looked for evidence on: Athletic performance, Exercise-induced muscle damage, Postoperative recovery, Crohn disease, Irritable bowel syndrome (IBS), Short bowel syndrome — and 4 related terms.
  • 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, Crohn disease, Radiation-induced diarrhea.
  • Also on file: Glutamine is rated "Insufficient Reliable Evidence To Rate" for Chemotherapy-induced diarrhea, Irritable bowel syndrome (IBS), Oral mucositis.

L-glutamine is effective for sickle cell disease. It's rated possibly effective for HIV/AIDS-related wasting, recovery after surgery, and critical illness from trauma.

The strength of evidence varies across these uses, so talk with your doctor about whether it fits your particular situation.

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 in healthy adults. The most common side effects are gastrointestinal — belching, bloating, constipation, diarrhea, flatulence, stomach pain, nausea, and vomiting, especially at higher doses.

Headache and musculoskeletal pain have also been reported. A small number of people have experienced dizziness or headache; one case resolved when the dose was lowered.

Rarely, people with bipolar disorder taking glutamine have reported mood changes (mania or hypomania), though this is uncommon. If you have kidney or liver disease, use it only under medical supervision.

The safety data in pregnancy is rated likely safe, but there isn't enough data during breastfeeding — talk with your doctor or pharmacist before using it if you're nursing.

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 medications (drugs to prevent seizures), double-check with your doctor or pharmacist before starting L-glutamine — it may theoretically reduce how well these drugs work, though this hasn't been confirmed in humans. Use the medication checker on this page to look up your exact drugs.

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.

L-glutamine is a straightforward single-ingredient powder backed by solid evidence for sickle cell disease and modest evidence for recovery and wasting conditions. It's generally well tolerated but can cause stomach upset, especially at high doses.

If you take anticonvulsant medications (seizure drugs), check with your doctor or pharmacist before adding this product, and mention any kidney or liver concerns.

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 26, 2020.

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 L-Glutamine Unflavored, straight from the product label.

Brand About Time
Barcode (UPC) 814577021463
Net contents 41.1 oz.; 400 Gram(s)
Market status On market
Date entered into DSLD Feb 26, 2020
DSLD ID 213814
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), Gluten Free, Sugar Free
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 L-Glutamine Unflavored by About Time, 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:
5 Gram(s)
Maximum serving Sizes:
5 Gram(s)
Servings per container
80
UPC/BARCODE
814577021463
IngredientAmount% DV
L-Glutamine5 Gram(s)--

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.
Formulation

The power of Glutamine Speeds muscle recovery Supports immune system Helps the body synthesize protein Supports gut health Precursor to Glutathione (the most powerful antioxidant)

Muscle recovery formula

At AboutTime we do not believe in sacrificing one good thing for another, we want it all! That's why we develop products that stand for great quality and taste. In addition, we appreciate simplicity which is why our L-glutamine powder is 100% pharmaceutical grade.

No sweeteners or fillers Gluten free Soy free

The ABOUTTIME core values AboutTime is blended and packaged at our own facility in Pittsburgh, PA in the United States of America.

Vegan Friendly

A Non GMO product made without genetically modified ingredients natural

Sugar Free Gluten Free Unsweetened Natural

Made in the USA

General Statements

Quality products made in USA

Please Recycle

Formula

AboutTime uses 100% pure L-glutamine in each and every serving of our muscle recovery formula. Each serving contains 5 grams of the free form amino acid, L-glutamine to aid in muscle recovery, boost athletic performance, and support gut health and digestion.

Made for Athletes

FDA Statement of Identity

Dietary Supplement

Suggested/Recommended/Usage/Directions

Directions: Mix 1 level scoop to 8 oz. water, or beverage of your choice. Enjoy.

Precautions

Warning: Consuming this product can expose you to chemicals including Lead and Cadmium, which is known to the State of California to cause cancer, and Lead and Cadmium, which is known to the State of California to cause birth defects and/or reproductive harm. For more information go to www.P65Warnings.ca.gov

FDA Disclaimer Statement

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

Seals/Symbols

GMP Good Manufacturing Practice

See for yourself

L-Glutamine Unflavored by About Time label

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

What’s inside

The Ingredients in L-Glutamine Unflavored by About Time

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

Serving size5 Gram(s) Dosage formPowder Servings per container80 Amounts shown are per serving.

L-Glutamine

Interacts with
50 drugs
5 Gram(s) 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
Interaction report

L-Glutamine Unflavored by About Time Drug Interactions

Want to check YOUR meds against L-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

Each ingredient & the kinds of drugs it affects

For each ingredient in L-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
The maker

Brand information

Manufacturer and brand details for L-Glutamine Unflavored, from the product label.

About Time

See all About Time products
Name
SDC Nutrition
Street Address
170 Industry Dr
City
Pittsburgh
State
PA
ZipCode
15275
Phone Number
866-982-9439
Web Address
TryAboutTime.com
Pharmacist Counseling Corner

L-Glutamine Unflavored by About Time: Common Questions

Does L-Glutamine Unflavored by About Time interact with any medications?
Yes. Based on its ingredients, L-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?
L-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.
What does L-glutamine do in the body?
L-glutamine is an amino acid that supports immune function, gut health, and muscle recovery. Your body makes it naturally, and supplemental doses are used to help with certain conditions like sickle cell disease, muscle wasting from HIV/AIDS, and recovery after surgery or critical illness.
Will this give me stomach upset?
Stomach side effects are the most common. Belching, bloating, constipation, diarrhea, gas, and nausea can happen, especially at higher doses. Starting with a lower dose and working up may help. If it persists, talk with your pharmacist about adjusting your amount.
Is it safe to take while pregnant or breastfeeding?
Pregnancy is rated likely safe. For breastfeeding, there isn't enough safety data, so it's best to talk with your doctor or pharmacist before using it while nursing — they can advise based on your situation.
Can I take this if I have kidney or liver problems?
If you have kidney or liver disease, use L-glutamine only under medical supervision. Talk with your doctor or pharmacist first to make sure it's right for you.
How is this product different from other glutamine supplements?
This is a plain, unflavored powder with L-glutamine as the only active ingredient and no added inactive ingredients — you're getting the amino acid itself without fillers or flavoring. The dose and timing will depend on what you're using it for, so follow your doctor's guidance or product instructions.
What if I have bipolar disorder?
A very small number of people with bipolar disorder who took glutamine supplements reported mood changes like mania or hypomania. If you have bipolar disorder, talk with your doctor before using this product.

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

Not sure if L-Glutamine Unflavored is safe with your meds?

Our pharmacists answer your medication & supplement questions — free.

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.

L-Glutamine Unflavored label
Go deeper

The Full Monographs Behind L-Glutamine Unflavored’s Ingredients

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

Sources

Sources & How We Checked

L-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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