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Dietary supplement

Amino L-Tyrosine Ingredients & Drug Interactions

by Genestra Brands

Amino L-Tyrosine 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 Amino L-Tyrosine 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

Amino L-Tyrosine is a dietary supplement by Genestra Brands 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 Amino L-Tyrosine by Genestra Brands

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

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HelloPharmacist Scorecard of Amino L-Tyrosine by Genestra Brands

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 16, 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.

Amino L-Tyrosine is a single-ingredient supplement containing L-tyrosine, an amino acid your body normally makes from another amino acid called phenylalanine. It serves as a precursor — a building block — for several important compounds, including thyroid hormones and neurotransmitters (chemical messengers in your brain).

The capsule itself contains hypromellose, a standard inert ingredient used to hold the supplement 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).

The evidence for L-tyrosine varies by use. It's effective for phenylketonuria (PKU), a rare genetic condition where the body can't process phenylalanine properly.

For cognitive function and memory, the evidence suggests it may be helpful, though it's not conclusive. For athletic performance, the available evidence suggests it's probably not effective.

For alcohol use disorder and dementia, we don't have enough reliable evidence yet to say whether it works.

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.

L-tyrosine is generally well tolerated in healthy adults, but the facts advise talking to a healthcare provider before using it regularly. The most common side effects reported in trials are fatigue, headache, heartburn, and nausea — usually mild and dose-dependent.

At very high doses, headache and fatigue are more likely. There isn't enough safety data on L-tyrosine during pregnancy, so it's best to talk with your doctor or pharmacist about whether it's right for you if you're pregnant.

Similarly, safety data during breastfeeding is limited, so caution is advised and you should confirm with your healthcare provider before use.

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.

Before taking Amino L-Tyrosine, check with your doctor or pharmacist if you take levodopa (Moderate severity — tyrosine may reduce its effectiveness) or thyroid hormone medications like levothyroxine (Moderate severity — tyrosine may increase thyroid hormone levels).

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 be worth considering if you're looking to support cognitive function or memory, or if you have PKU. If you take levodopa or thyroid medication, you'll need to check with your doctor or pharmacist first — spacing doses or adjusting them may be necessary.

Because safety data in pregnancy and breastfeeding is limited, those situations also call for a conversation with your healthcare provider before you start.

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 Jan 22, 2021.

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 Amino L-Tyrosine, straight from the product label.

Brand Genestra Brands
Barcode (UPC) 883196102006
Net contents 60 Vegetarian Capsule(s)
Market status On market
Date entered into DSLD Jan 22, 2021
DSLD ID 241123
Product type Amino Acid/protein
Supplement form Capsule
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Adult (18 - 50 Years)
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 Amino L-Tyrosine by Genestra Brands, 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:
1 Capsule(s)
Servings per container
60
UPC/BARCODE
883196102006
IngredientAmount% DV
L-Tyrosine475 mg--

Other ingredients: Hypromellose

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

Recommended Dose: Take 1 capsule 3 times daily or as recommended by your health professional.

Precautions

Warning: If you are pregnant or lactating, have any health condition or are taking any medication, consult your health professional before use.

Keep out of the reach of children.

Use only if safety seal is intact.

Storage

Store in a cool, dry place.

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.

General Statements

Contents may not fill package in order to accommodate required labeling. Please rely on stated quantity. Scan to learn about our quality excellence

FDA Statement of Identity

Dietary Supplement

Formulation

Support for emotional wellness and restful sleep

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

See for yourself

Amino L-Tyrosine by Genestra Brands label

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

Amino L-Tyrosine 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 Amino L-Tyrosine by Genestra Brands

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 container60 Amounts shown are per serving.

L-Tyrosine

Interacts with
21 drugs
475 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: Hypromellose. These complete the product’s ingredient list but are not active constituents.

Interaction report

Amino L-Tyrosine by Genestra Brands Drug Interactions

Want to check YOUR meds against Amino L-Tyrosine?

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 Amino L-Tyrosine interact with 21 drugs. Click any drug to see the details.

1 of the 1 ingredient in Amino L-Tyrosine 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 Amino L-Tyrosine 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 Amino L-Tyrosine, from the product label.

Genestra Brands

Name
Seroyal USA
City
Pittsburgh
State
PA
ZipCode
15275
Phone Number
1-888-737-6925
Web Address
seroyal.com
Pharmacist Counseling Corner

Amino L-Tyrosine by Genestra Brands: Common Questions

Does Amino L-Tyrosine by Genestra Brands interact with any medications?
Yes. Based on its ingredients, Amino L-Tyrosine 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?
Amino L-Tyrosine 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 thyroid hormones and brain chemicals. Your body normally makes it from another amino acid called phenylalanine. This supplement provides extra tyrosine if your diet is low in it or if a healthcare provider recommends it for a specific reason.
Does L-tyrosine really help with focus and memory?
The evidence suggests it may help with cognitive function and memory, but the research isn't conclusive — that's why we rate it as possibly effective rather than proven. Your results may vary, and it's worth discussing with your doctor or pharmacist whether it's a good fit for you.
What are the side effects?
The most common side effects are fatigue, headache, heartburn, and nausea. These are usually mild and more likely at higher doses. No serious adverse effects have been documented, though a thorough safety review hasn't been completed.
Is it safe to take during pregnancy or while breastfeeding?
There isn't enough safety data to say either way for pregnancy or breastfeeding. Talk with your doctor or pharmacist before taking it if you're pregnant, planning to become pregnant, or breastfeeding — they can give you personalized advice based on your situation.
Can I take L-tyrosine if I have a thyroid condition and take thyroid medication?
That's a conversation you need to have with your doctor or pharmacist. Because tyrosine is a precursor to thyroid hormones, it may increase your hormone levels, so your provider may need to monitor you or adjust your medication.
What's in the capsule besides the L-tyrosine?
The capsule contains hypromellose, which is a standard ingredient used to hold the supplement together. There are no other active ingredients.

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

Not sure if Amino L-Tyrosine 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.

Amino L-Tyrosine label
Go deeper

The Full Monographs Behind Amino L-Tyrosine’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

Amino L-Tyrosine'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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