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Dietary supplement

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

by NutraBio

100% 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 100% 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

100% Pure L-Tyrosine 500 mg 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 mg by NutraBio

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

Pharmacist-reviewed data Checks every ingredient Answer in seconds
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HelloPharmacist Scorecard of 100% Pure L-Tyrosine 500 mg 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 product contains one active ingredient: L-tyrosine at 500 mg per capsule. Tyrosine is an amino acid your body uses to make neurotransmitters (chemical messengers in your brain) and thyroid hormones.

The capsule itself is made from vegetable material.

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).

The evidence is strongest for phenylketonuria (PKU), a genetic condition — tyrosine is effective for that. For cognitive function and memory, the data suggests it's possibly effective, though the evidence isn't conclusive.

For athletic performance, the evidence suggests it's possibly ineffective. We don't have enough reliable evidence to rate it 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, though the data on long-term use isn't thorough. The most common side effects reported are fatigue, headache, heartburn, and nausea.

At very high doses, headache and fatigue increase, and combining it with other supplements can cause drowsiness, agitation, diarrhea, and vomiting — effects that usually improve if you lower the dose. We don't have enough safety data on pregnancy or breastfeeding, so talk with your doctor or pharmacist before taking it in either situation.

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.

Double-check this before you start if you take levodopa (for Parkinson's disease) — separate your doses by at least two hours. Also check if you're on thyroid hormone medication, since tyrosine might increase its effects.

Use the search tool below with your exact medications to be sure.

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.

L-tyrosine may help with cognitive function and memory in some people, and it's the standard treatment for PKU. If you take levodopa for Parkinson's or thyroid hormone medication, you'll need to be cautious and check with your pharmacist.

Even in healthy adults, talk with a healthcare provider before starting regular use.

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

Brand NutraBio
Barcode (UPC) 649908232962
Net contents 150 V-Cap(s)
Market status On market
Date entered into DSLD Feb 26, 2020
DSLD ID 213044
Product type Amino Acid/protein
Supplement form Capsule
Dietary claims / uses Nutrient, All Other, Structure/Function
Intended target group(s) Vegetarian, Adult (18 - 50 Years), Kosher, 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 mg 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
150
UPC/BARCODE
649908232962
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.
Suggested/Recommended/Usage/Directions

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.

Formulation

Vegetarian

Non-GMO | Gluten free | BSE/TSE free

HPLC lab tested for potency

No fillers No excipients Free of harmful impurities

Precautions

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

If you are pregnant, breast feeding, 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.

Discontinue use two week prior to surgery.

General Statements

Manufactured in our GMP & FDA Inspected Facility FDA Registration: 16906175560 Since 1996

Check. Verify. Trust. View independent lab results Checkmysupps.com

FDA Statement of Identity

Dietary supplement

Seals/Symbols

OU (Kosher)

Made in USA With ingredients sourced worldwide

Formula

OU (Kosher)

Pure grade amino acid

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.

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 mg by NutraBio label

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

100% 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 100% Pure L-Tyrosine 500 mg 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 container150 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 mg by NutraBio Drug Interactions

Want to check YOUR meds against 100% 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 100% Pure L-Tyrosine 500 mg interact with 21 drugs. Click any drug to see the details.

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

NutraBio

See all NutraBio products
Name
NutraBio Labs
Pharmacist Counseling Corner

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

Does 100% Pure L-Tyrosine 500 mg by NutraBio interact with any medications?
Yes. Based on its ingredients, 100% 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?
100% 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 in my body?
Tyrosine is an amino acid — a building block your body uses to make neurotransmitters (brain chemicals that affect mood, focus, and energy) and thyroid hormones. This supplement gives you an extra dose of it beyond what you'd normally get from food.
Will L-tyrosine help me think more clearly or remember better?
The evidence suggests it's possibly effective for cognitive function and memory, but it's not definitive. Results vary from person to person, so it may work for you or it may not.
What are the most common side effects?
At typical doses, fatigue, headache, heartburn, and nausea are the most commonly reported side effects. At very high doses, these can worsen, and they usually improve if you lower your dose.
Is it safe to take this while pregnant or breastfeeding?
We don't have enough safety data to know either way. Talk with your doctor or pharmacist about whether this is right for you during pregnancy or while nursing — they can give you personalized advice based on your situation.
Can I take this regularly, or is it just for occasional use?
While tyrosine is generally well tolerated, we don't have thorough long-term safety data. Before you start taking it regularly, talk with a healthcare provider to make sure it's appropriate for you.
Does this supplement have any fillers or other ingredients?
No — it's just L-tyrosine in a vegetable capsule. The capsule itself is the only inactive ingredient.

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.

100% Pure L-Tyrosine 500 mg label
Go deeper

The Full Monographs Behind 100% 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

100% 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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