Major interaction on record — check this product against your medications before combining. Check your meds →
Dietary supplement

L-Threonine Ingredients & Drug Interactions

by BulkSupplements.com

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

L-Threonine is a dietary supplement by BulkSupplements.com with 1 active ingredient. Its ingredients are commonly taken for general amino acid/protein support, muscle and tissue health, immune support.Based on those ingredients, 3 medications have a known interaction with it, the most serious rated major. The ingredients most likely to interact are L-Threonine. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

HelloPharmacist Scorecard of L-Threonine by BulkSupplements.com

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-threonine, an amino acid your body uses to build and repair proteins. It's the form you're looking at here — a powder you mix into food or drink.

Does it work?

Couldn't assess
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
Not assessable

This is a single-ingredient Threonine product and its label doesn't state a use — see Threonine's own graded uses on its monograph.

Why this rating?
  • We looked at the product name, claims, and label statements and couldn't find a stated purpose to grade.

The evidence for L-threonine is mixed and limited. For ALS (Lou Gehrig's disease), it's rated possibly ineffective.

For multiple sclerosis, familial spastic paraparesis, and spasticity, there isn't enough reliable evidence in our data to say whether it works or not. If you're considering it for a specific condition, talk with your doctor about what the research actually supports for your situation.

The evidence, ingredient by ingredient Threonine

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.

Threonine from food is safe, but the supplement at higher doses hasn't been well studied. Headache has been reported in people taking it, and some have experienced minor stomach upset including diarrhea, gas, or constipation.

Because supplement safety in pregnancy and breastfeeding hasn't been well studied, the caution is to avoid it during those times unless a clinician advises otherwise.

Side effects, ingredient by ingredient Threonine

Meds to double-check

Major interaction found
Known Interaction Concern · database check
Major identified

At least one ingredient has a documented Major-severity interaction. Check your medications for a personalized result.

Why this rating?
  • 1 of the 1 matched ingredient can interact with medications — Threonine.
  • The most serious interaction on file is rated Major.
  • For scale: 3 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 an NMDA antagonist — a brain medication like memantine or ketamine — double-check with your pharmacist before starting L-threonine. The supplement may lower how well your medication works.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFully disclosed formula with no assessable stated purpose. Major medication interactions have been identified, and safety information is well characterized.

L-threonine is a single amino acid with limited evidence for specific conditions. If you take an NMDA antagonist (such as memantine), you'll want to check with your pharmacist first — this supplement may interfere with how that drug works.

Otherwise, talk with your doctor about whether this is the right choice for what you're trying to address.

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 May 23, 2024.

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-Threonine, straight from the product label.

Brand BulkSupplements.com
Barcode (UPC) X000IOD277
Net contents 100 Gram(s); 3.5 Ounce(s)
Market status On market
Date entered into DSLD May 23, 2024
DSLD ID 312280
Product type Amino Acid/protein
Supplement form Powder
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Adult (18 - 50 Years), Gluten Free, Dairy 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-Threonine by BulkSupplements.com, 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:
500 mg
Maximum serving Sizes:
500 mg
Servings per container
200
UPC/BARCODE
X000IOD277
IngredientAmount% DV
L-Threonine500 mg--

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.
Brand IP Statement(s)

BulkSupplements.com Clean & Pure Bulk Supplements

Formulation

Free of: Added sugar, soy, dairy, yeast, gluten, additives

Suggested/Recommended/Usage/Directions

Suggested Use: As a dietary supplement, take 500 mg (about 1/5 tsp) once daily, or as directed by a physician.

General Statements

Use an accurate milligram scale.

New

Storage

Contents are sold by weight, not volume. Settling may occur. Store in a dry, cool place

FDA Disclaimer Statement

Warning: This product is not intended to diagnose, treat, cure, or prevent any disease.

Precautions

Always consult a physician before taking any dietary supplement.

Keep out of reach of children.

See for yourself

L-Threonine by BulkSupplements.com label

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

What’s inside

The Ingredients in L-Threonine by BulkSupplements.com

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

Serving size500 mg Dosage formPowder Servings per container200 Amounts shown are per serving.

L-Threonine

Interacts with
3 drugs
500 mg per serving

Threonine is an essential amino acid your body needs but cannot make, so you must get it from food or supplements. Most people get plenty from a norma...

L-Threonine monograph & interactions
Interaction report

L-Threonine by BulkSupplements.com Drug Interactions

Want to check YOUR meds against L-Threonine?

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
3Drugs
3 Major

Ingredients driving the most interactions

Each ingredient & the kinds of drugs it affects

For each ingredient in L-Threonine 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-Threonine1 drug type · 3 drugs

Nmda Antagonists

Theoretically, threonine might decrease the effects of NMDA antagonists.
Threonine increases central nervous system (CNS) glycine levels. Glycine seems to bind a site on NMDA receptors and enhance the activity of the receptors.

Likelihood Likely Evidence B
The maker

Brand information

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

BulkSupplements.com

See all BulkSupplements.com products
Name
BulkSupplements.com
Street Address
7511 Eastgate Rd
City
Henderson
State
NV
ZipCode
89011
Web Address
BulkSupplements.com
Pharmacist Counseling Corner

L-Threonine by BulkSupplements.com: Common Questions

Does L-Threonine by BulkSupplements.com interact with any medications?
Yes. Based on its ingredients, L-Threonine has a known interaction with 3 medications, including 3 rated major. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
L-Threonine 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.
Can I take L-threonine if I'm pregnant or breastfeeding?
The safety of L-threonine supplements during pregnancy and breastfeeding hasn't been well studied. While the amount you get from food is normal, supplements are a different story. Talk with your doctor or pharmacist before using it during pregnancy or while nursing — they can give you personalized advice based on your situation.
What side effects should I watch for?
Headache is the most commonly reported side effect. Some people also experience minor stomach upset — diarrhea, gas, or constipation. If these bother you or don't improve, stop taking it and let your pharmacist know.
Does L-threonine actually work for ALS or multiple sclerosis?
For ALS, it's rated possibly ineffective based on available evidence. For multiple sclerosis and other spasticity conditions, there isn't enough reliable evidence to say either way. If you're dealing with one of these conditions, your neurologist can help you sort through what options are actually supported by research.
Is this just a fancy amino acid, or does it do something special?
It's an amino acid your body uses for proteins. In supplement form at higher doses, though, the research on what it actually does is limited — that's why the evidence ratings are modest or incomplete.

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

Not sure if L-Threonine 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-Threonine label
Sources

Sources & How We Checked

L-Threonine'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 4 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.

Threonine 4 references
  1. Tandan R, Bromberg MB, Forshew D, et al. A controlled trial of amino acid therapy in amyotrophic lateral sclerosis: I. Clinical, functional, and maximum isometric torque data. Neurology 1996;47:1220-6. PubMed
  2. Lee A, Patterson V. A double blind study of L-threonine in patients with spinal spasticity. Acta Neurol Scand 1993;88:334-8. PubMed
  3. Blin O, Pouget J, Aubrespy G, et al. A double-blind placebo controlled trial of L-threonine in amyotrophic lateral sclerosis. J Neurol 1992;239:79-81.
  4. Roufs JB. L-threonine as a symptomatic treatment for amyotrophic lateral sclerosis (ALS). Med Hypotheses 1991;34:20-3. PubMed

See these in context on the Threonine 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

Keep exploring