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Dietary supplement

100% Pure L-Tyrosine 500 Milligrams Ingredients & Drug Interactions

by NutraBio

100% Pure L-Tyrosine 500 Milligrams 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 100% Pure L-Tyrosine 500 Milligrams 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

100% Pure L-Tyrosine 500 Milligrams is a dietary supplement by NutraBio 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 100% Pure L-Tyrosine 500 Milligrams by NutraBio

Ask about any prescription or over-the-counter medication and we check it for interactions with 100% Pure L-Tyrosine 500 Milligrams by NutraBio — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of 100% Pure L-Tyrosine 500 Milligrams by NutraBio

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 11, 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 is a single-ingredient product: L-tyrosine, an amino acid your body makes naturally and uses to build proteins and brain chemicals. The capsule itself is made from vegetable material.

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: Mental focus, alertness, stress, and mood support.
  • We looked for evidence on: Athletic performance, Attention deficit-hyperactivity disorder (ADHD), Cognitive function, Fatigue, Memory, Narcolepsy — and 4 related terms.
  • The strongest evidence on file: Tyrosine is rated "Possibly Effective" for Cognitive function (Natural Medicines).
  • Also on file: Tyrosine is rated "Possibly Effective" for Memory.
  • Also on file: Tyrosine is rated "Possibly Ineffective" for Athletic performance.

The science backs L-tyrosine for one thing: treating PKU (phenylketonuria), a rare genetic condition. For cognitive function and memory, the evidence is possibly helpful — some studies suggest a benefit, but more research is needed.

For athletic performance, it looks possibly ineffective. For alcohol use disorder and dementia, there isn't enough reliable evidence to say either way yet.

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. The most common side effects in people who took it were fatigue, headache, heartburn, and nausea — usually at higher doses.

No serious adverse effects have been documented, though a full safety evaluation hasn't been done. Before taking it regularly, talk with a healthcare provider.

There isn't enough safety data during pregnancy, and breastfeeding safety data is also limited — talk to your doctor 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 before starting if you take levodopa (a Parkinson's medication) — you'll need to space doses 2 hours apart. Also double-check if you're on thyroid hormone medication.

No other medication interactions are documented for the ingredients we could check.

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-Tyrosine is a straightforward amino acid supplement that works for PKU and shows promise for brain function. If you take levodopa for Parkinson's or thyroid hormone medication, check with your pharmacist first — timing matters.

For everyone else, the biggest caution is just making sure you know what you're using it for and that your provider agrees.

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 Sep 25, 2015.

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 100% Pure L-Tyrosine 500 Milligrams, straight from the product label.

Brand NutraBio
Barcode (UPC) 649908232979
Net contents 500 Cap(s)
Market status On market
Date entered into DSLD Sep 25, 2015
DSLD ID 51005
Product type Amino Acid/protein
Supplement form Capsule
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Adult (18 - 50 Years), Kosher, No Allergies, Gluten 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 100% Pure L-Tyrosine 500 Milligrams by NutraBio, 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 Vegetable Capsule(s)
Maximum serving Sizes:
2 Vegetable Capsule(s)
Servings per container
500
UPC/BARCODE
649908232979
IngredientAmount% DV
L-Tyrosine500 mg--

Other ingredients: Vegetable Capsule

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.
General Statements

Vegetable Capsule

500 servings

Quality and purity since 1996. NutraBio manufactures in our own FDA registered & inspected GMP facility complying with FDA 21 CFR Part 111 regulations.

Manufactured in a GMP & FDA Inspected Facility

Pharmaceutical Grade. HPLC Lab Tested for Potency.

Seals/Symbols

OU

Made in a GMP & FDA Inspected Facility

Made in USA

TRUE LABEL FULL LABEL DISCLOSURE

Formulation

Kosher, Hypoallergenic, Non-GMO, Gluten Free and BSE/TSE Free. No added sugars, salt, preservatives, salicylates, or artificial color, flavor or fragrance.

Kosher, Hypoallergenic, Non-GMO, Gluten Free and BSE/TSE Free.

Zero Fillers or Excipients Inferior Ingredients Banned Substances / Added Sugars Proprietary Blends Hidden Ingredients

Non-GMO - Gluten Free - BSE/TSE Free

Allergen Free

No fillers - No Excipients - No additives

Free of Harmful Impurities.

Brand IP Statement(s)

NutraBio Since 1996

Amino Therapy

Storage

Store in a cool dry place.

FDA Disclaimer Statement

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

General

23297-004 B20028-002

Formula

Kosher, Hypoallergenic, Non-GMO, Gluten Free and BSE/TSE Free.

Free Form Amino Acid

Suggested/Recommended/Usage/Directions

1-2 capsules - 1-2x daily - Best if taken - Empty Stomach

Suggested Use: As a dietary supplement, take 1 to 2 serving(s) with your favorite beverage 1 to 2 times daily on an empty stomach or as directed by your physician.

Precautions

Warning: Not intended for use by persons under the age of 18. Keep out of reach of children.

If you are pregnant, breastfeeding, have known medical conditions (including kidney or liver disease) or are taking prescription or OTC medication(s) consult with your health care practitioner before using this product. Do not take in conjunction with MAO inhibitor drugs. Not for use by persons with a history of malignant melanoma or if bipolar, pregnant, suspect pregnancy, or lactating. Tyrosine should not be taken by those with conditions associated with increased dopamine levels such as mania and schizophrenia. This supplement may increase sensitivity to the effects of CNS stimulants. Caution is advised when taking tyrosine along with stimulants and dosages should be lowered accordingly.

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

100% Pure L-Tyrosine 500 Milligrams by NutraBio label

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

100% Pure L-Tyrosine 500 Milligrams 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 100% Pure L-Tyrosine 500 Milligrams by NutraBio

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

Serving size1 Vegetable Capsule(s) Dosage formCapsule Servings per container500 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: Vegetable Capsule. These complete the product’s ingredient list but are not active constituents.

Interaction report

100% Pure L-Tyrosine 500 Milligrams by NutraBio Drug Interactions

Want to check YOUR meds against 100% Pure L-Tyrosine 500 Milligrams?

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 100% Pure L-Tyrosine 500 Milligrams interact with 21 drugs. Click any drug to see the details.

1 of the 1 ingredient in 100% Pure L-Tyrosine 500 Milligrams 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 100% Pure L-Tyrosine 500 Milligrams 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 100% Pure L-Tyrosine 500 Milligrams, from the product label.

NutraBio

See all NutraBio products
Name
NutraBio Labs, Inc.
Street Address
564 Lincoln Blvd.
City
Middlesex
State
NJ
ZipCode
08846
Phone Number
732-748-8606
Web Address
www.nutrabio.com
Pharmacist Counseling Corner

100% Pure L-Tyrosine 500 Milligrams by NutraBio: Common Questions

Does 100% Pure L-Tyrosine 500 Milligrams by NutraBio interact with any medications?
Yes. Based on its ingredients, 100% Pure L-Tyrosine 500 Milligrams 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?
100% Pure L-Tyrosine 500 Milligrams 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 actually for?
It's an amino acid your body uses to make proteins and brain chemicals like dopamine and norepinephrine. It's proven to help treat PKU, and some evidence suggests it may support memory and cognitive function — though more research is needed for those uses.
Will this help me focus or think clearer?
Possibly. The evidence for memory and cognitive function is "possibly effective," meaning some studies suggest a benefit but it's not definitive yet. Your results may vary.
What side effects should I watch for?
Most common are fatigue, headache, heartburn, and nausea — usually at higher doses. No serious side effects have been documented, but a thorough safety check hasn't been completed.
Is it okay to take while pregnant or breastfeeding?
There isn't enough safety data for either. Talk with your doctor or pharmacist for personalized advice before using it.
Can I take this with my Parkinson's medication?
You can, but you'll need to space doses carefully. Tyrosine and levodopa compete for absorption, so separate them by at least 2 hours to keep the levodopa working.

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

Not sure if 100% Pure L-Tyrosine 500 Milligrams is safe with your meds?

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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.

100% Pure L-Tyrosine 500 Milligrams label
Go deeper

The Full Monographs Behind 100% Pure L-Tyrosine 500 Milligrams’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

100% Pure L-Tyrosine 500 Milligrams'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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