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Tyrosine

Drug ingredient

CAS 556-03-6

This chemical is an active pharmaceutical ingredient used in FDA-regulated drugs.

Molecular structure of 556-03-6
US productionNot reported
Import value, 2024$652M
Top sourceSingapore 77%

This chemical is listed as active in US commerce, but no company reported it to EPA’s survey for 2019 or 2023. Sites may have made or imported less than the threshold amount, or none.

Why supply is unknown

Production is reported production, not a complete census of factories. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 292250 · basket

These shares come from HS customs code 292250, which covers 76 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
SG 77%SingaporeCN 12%ChinaIT 4%ItalyIN 2%IndiaGB 1%United Kingdom
17 FDA-registered drug labelers
Ajinomoto Co., Inc.
Ajinomoto Health & Nutrition North America Inc.
Apex Energetics Inc.
B. Braun Medical Inc.
Baxter Healthcare Company
Baxter Healthcare Corporation
BioActive Nutritional, Inc.
DNA Labs, Inc.
Energique, Inc.
Fresenius Kabi USA, LLC
Guna spa
ICU Medical Inc.
Liddell Laboratories, Inc.
Nippon Rika Co., Ltd.
Nutritional Specialties, Inc.
ProBlen
Professional Complementary Health Formulas

Why It Matters

Sectors
Health
Downstream Uses

Appears in 21 drug and cosmetic product listings (FDA).

  • •Aminosyn-PF
  • •Plenamine
  • •Kabiven
  • •Clinimix
  • •Clinimix E
  • •Clinisol
  • •D-87
  • •L-Tyrosine 7427
Show all 21
  • •ProSol
  • •TrophAmine
  • •GUNA-Matrix
  • •Metabatone
  • •Vital Skin Hair Nails
  • •E08 Bioclock Regulator
  • •OB Metab
  • •Travasol
  • •Perikabiven
  • •Metab
  • •HGH Complex
  • •L-Tyrosine High 7428
  • •Premasol - sulfite-free (Amino Acid)
FDA Shortage Status
No FDA shortage records

Chemical Identity

CAS556-03-6
PubChem CIDNot recorded
DTXSIDDTXSID50859040
FormulaC9H11NO3
Mol. Weight181.191 g/mol
SMILESNC(CC1=CC=C(O)C=C1)C(O)=O

Data Sources

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Brief citations

Tyrosine (CAS 556-03-6) https://chemicalindependence.com/chemical/556-03-6/ EPA TSCA Inventory: CAS 556-03-6. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory FDA National Drug Code directory: CAS 556-03-6. Retrieved 2026-10-04. https://open.fda.gov/data/ndc/ US Census international trade: HS 292250 for CAS 556-03-6. Reporting year: 2024. https://usatrade.census.gov/