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Dietary supplement

Pure L-Tyrosine 500 mg Ingredients & Drug Interactions

by Montiff

Pure L-Tyrosine 500 mg label
See full label image
Capsule 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 Pure L-Tyrosine 500 mg 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

Pure L-Tyrosine 500 mg is a dietary supplement by Montiff with 1 active ingredient. Its ingredients are commonly taken for mental focus and alertness, coping with stress, fatigue and sleep loss.Based on those ingredients, 21 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are L-Tyrosine. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against Pure L-Tyrosine 500 mg by Montiff

Ask about any prescription or over-the-counter medication and we check it for interactions with Pure L-Tyrosine 500 mg by Montiff — and tell you which ingredient is responsible.

Pharmacist-reviewed data Checks every ingredient Answer in seconds
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HelloPharmacist Scorecard of Pure L-Tyrosine 500 mg by Montiff

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 Sep 3, 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-tyrosine, an amino acid your body naturally produces and uses to make neurotransmitters (brain chemicals) and thyroid hormones. Each capsule delivers 500 mg.

The capsule itself and the inactive ingredients — gelatin, cellulose, magnesium stearate, and silicon dioxide — are fillers and binders that hold it together.

Does it work?

Strong 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

This product doesn't appear to be marketed for a specific use, so we graded Tyrosine's overall clinical evidence instead.

Strong

Strong clinical evidence supports Tyrosine for:

Why this rating?
  • We looked at the product name, claims, and label statements and couldn't find a stated purpose to grade.
  • Since the label doesn't commit to one use, we graded the ingredient's overall clinical evidence instead.
  • On file: Phenylketonuria (PKU) — rated "Effective" (Natural Medicines).
  • On file: Cognitive function — rated "Possibly Effective" (Natural Medicines).
  • On file: Memory — rated "Possibly Effective" (Natural Medicines).

L-tyrosine is rated effective for phenylketonuria (PKU), a rare metabolic condition. It's possibly effective for cognitive function and memory, meaning there's some evidence it may help, though more research would strengthen that claim.

For athletic performance, the evidence suggests it's possibly ineffective. The data we hold doesn't establish reliable evidence for alcohol use disorder or dementia.

The evidence, ingredient by ingredient Tyrosine

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.

Tyrosine is generally well tolerated in healthy adults, but there isn't enough safety data to recommend regular supplemental doses without a doctor's guidance — talk to your healthcare provider before making it part of your routine. Common side effects at typical doses include fatigue, headache, heartburn, and nausea.

At very high doses (150 mg/kg), headache and fatigue become more pronounced, and effects like drowsiness and agitation can occur when combined with other supplements. There isn't enough safety information to know whether it's safe during pregnancy or breastfeeding — speak with your doctor or pharmacist before taking it if you're pregnant or nursing.

Side effects, ingredient by ingredient Tyrosine

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 — Tyrosine.
  • The most serious interaction on file is rated Moderate.
  • Some involve high-stakes drug classes: Parkinson's medications.
  • For scale: 21 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.

Check with your doctor or pharmacist before taking this if you use levodopa for Parkinson's disease (separate doses by at least 2 hours if you do) or thyroid hormone medications. No other interactions are documented in our data for the ingredients we could check, but that's not a guarantee none exist — your pharmacist can confirm your full medication list against this product.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFully disclosed formula with strong clinical evidence behind its ingredients' uses. Moderate medication interactions have been identified, and safety information is well characterized.

This supplement is worth considering if you're looking for a cognitive or memory boost and don't take levodopa or thyroid medications. If you do take either of those, or any other prescription drug, check your exact medications with your pharmacist or doctor before starting.

Side effects are usually mild, but regular use warrants a conversation with your healthcare provider first.

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 Nov 21, 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 Pure L-Tyrosine 500 mg, straight from the product label.

Brand Montiff
Barcode (UPC) 683268104521
Net contents 250 Capsule(s)
Market status On market
Date entered into DSLD Nov 21, 2020
DSLD ID 237066
Product type Amino Acid/protein
Supplement form Capsule
Dietary claims / uses Nutrient, All Other
Intended target group(s) Vegetarian, Adult (18 - 50 Years), Dairy 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 Pure L-Tyrosine 500 mg by Montiff, 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:
1 Capsule(s)
Maximum serving Sizes:
4 Capsule(s)
Servings per container
250
UPC/BARCODE
683268104521
IngredientAmount% DV
L-Tyrosine500 mg--

Other ingredients: Gelatin, Cellulose, Magnesium Stearate, Silicon Dioxide

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.
Suggested/Recommended/Usage/Directions

Directions: As a dietary supplement, take one to four capsules daily, or as recommended by a health care professional. To be used as a dietary supplement in a normal food program. It is recommended that this product be taken with vitamins and minerals.

Formulation

Contains no starch, corn, milk, wheat, yeast, sugar, eggs, salt, artificial colors, binders, flavors, preservatives, fish derivatives or animal products.

A GMP product.

Highest quality available

Storage

Do not refrigerate. Store in a cool, dry place. Keep tightly closed.

Precautions

Keep out of reach of children.

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.

Brand IP Statement(s)

Montiff, Inc. All rights reserved.

General Statements

A Don Tyson company

NDC:65883-450-19

For information call: (310) 582-8938

Formula

Pure L-Tyrosine 500 milligrams

FDA Statement of Identity

Dietary Supplement

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

See for yourself

Pure L-Tyrosine 500 mg by Montiff label

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

Pure L-Tyrosine 500 mg 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 Pure L-Tyrosine 500 mg by Montiff

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

Serving size1 Capsule(s) Dosage formCapsule Servings per container250 Amounts shown are per serving.

L-Tyrosine

Interacts with
21 drugs
500 mg per serving

L-tyrosine is an amino acid your body uses to make brain chemicals like dopamine and norepinephrine. Some studies suggest it may help mental performan...

L-Tyrosine monograph & interactions

Other (inactive) ingredients: Gelatin, Cellulose, Magnesium Stearate, Silicon Dioxide. These complete the product’s ingredient list but are not active constituents.

Interaction report

Pure L-Tyrosine 500 mg by Montiff Drug Interactions

Want to check YOUR meds against Pure L-Tyrosine 500 mg?

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
21Drugs
21 Moderate

Ingredients driving the most interactions

L-Tyrosine 21

Individual Drug Interactions

The ingredients in Pure L-Tyrosine 500 mg interact with 21 drugs. Click any drug to see the details.

1 of the 1 ingredient in Pure L-Tyrosine 500 mg interact with drugs. Each result below shows which ingredient is responsible. L-Tyrosine

Each ingredient & the kinds of drugs it affects

For each ingredient in Pure L-Tyrosine 500 mg 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-Tyrosine2 drug types · 21 drugs

Levodopa

Theoretically, tyrosine might decrease the effectiveness of levodopa.
Tyrosine and levodopa compete for absorption in the proximal duodenum by the large neutral amino acid (LNAA) transport system. Advise patients to separate doses of tyrosine and levodopa by at least 2 hours.

Likelihood Probable Evidence D
Thyroid Hormone

Theoretically, tyrosine might have additive effects with thyroid hormone medications.
Tyrosine is a precursor to thyroxine and might increase levels of thyroid hormones.

Likelihood Probable Evidence D
L-Tyrosine full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Pure L-Tyrosine 500 mg, from the product label.

Montiff

See all Montiff products
Name
Montiff, Inc.
City
LA County
State
CA
ZipCode
90404
Phone Number
(310) 582-8938
Pharmacist Counseling Corner

Pure L-Tyrosine 500 mg by Montiff: Common Questions

Does Pure L-Tyrosine 500 mg by Montiff interact with any medications?
Yes. Based on its ingredients, Pure L-Tyrosine 500 mg has a known interaction with 21 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Pure L-Tyrosine 500 mg 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 is L-tyrosine and what does it do?
L-tyrosine is an amino acid — a building block your body uses to make neurotransmitters and thyroid hormones. It's naturally present in foods like chicken and eggs. The supplement form is used to support brain function and potentially improve memory and focus.
Will this help my memory or thinking?
L-tyrosine is rated possibly effective for both memory and cognitive function, meaning there's some evidence it may help, but the research isn't conclusive yet. Whether it works for you personally is something to discuss with your doctor, especially if you're taking other medications.
What side effects might I notice?
Most common side effects are fatigue, headache, heartburn, and nausea, especially at higher doses. These are usually mild, but if you notice them, lower your dose or stop and talk to your pharmacist. No serious adverse effects have been documented.
Is it safe to take while pregnant or breastfeeding?
There isn't enough safety data to know whether L-tyrosine is safe during pregnancy or breastfeeding. Talk with your doctor or pharmacist about whether it's right for you in either situation — they can weigh the pros and cons for your specific circumstances.
Why can't I take this with levodopa?
L-tyrosine and levodopa compete to be absorbed through the same pathway in your small intestine, so taking them together may reduce how well levodopa works for Parkinson's symptoms. If you take levodopa, separate this supplement by at least 2 hours, and check with your pharmacist first.
Does this contain any fillers?
Yes. The capsule itself and the inactive ingredients — gelatin, cellulose, magnesium stearate, and silicon dioxide — are used to hold the active ingredient together. If you're allergic or sensitive to any of these, let your pharmacist know.

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

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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.

Pure L-Tyrosine 500 mg label
Go deeper

The Full Monographs Behind Pure L-Tyrosine 500 mg’s Ingredients

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

Herb & supplement monograph

Tyrosine

Interacts with 21 drugs

L-tyrosine is an amino acid your body uses to make brain chemicals like dopamine and norepinephrine. Some studies suggest it may help mental performance during short-term stress, sleep loss,...

Read the full Tyrosine monograph →
Sources

Sources & How We Checked

Pure L-Tyrosine 500 mg'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.

Tyrosine 4 references
  1. Meyer JS, Welch KM, Deshmukh VD, et al. Neurotransmitter precursor amino acids in the treatment of multi-infarct dementia and Alzheimer's disease. J Amer Geriat Soc 1977;25:289-98.
  2. DiPiro JT, Talbert RL, Yee GC, et al; eds. Pharmacotherapy: A pathophysiologic approach. 4th ed. Stamford, CT: Appleton & Lange, 1999.
  3. Wood DR, Reimherr FW, Wender PH. Amino acid precursors for the treatment of attention deficit disorder, residual type. Psychopharmacol Bull 1985;21:146-9.
  4. van Spronsen FJ, van Rijn M, Bekhof J. Phenylketonuria: tyrosine supplementation in phenylalanine-restricted diets. Am J Clin Nutr 2001;73:153-7. PubMed

See these in context on the Tyrosine 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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