L-tryptophan is an essential amino acid involved in protein biosynthesis. It serves as a metabolic precursor to key biomolecules such as serotonin, melatonin, and vitamin B3.
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L-arginine
nutritional supplement and dietary additive
L-histidine zwitterion
nutritional supplement and dietary additive
L-isoleucine
nutritional supplement and flavoring agent
D(+)-Isoascorbic acid sodium salt
Antioxidant food preservative
Aldehydo-N-acetyl-D-glucosamine
personal care ingredient
N-nitrosoproline
Nitrosamine reference standard
DL-Tryptophan
essential amino acid
D-Tryptophan-2,4,5,6,7-d5
research compound
The international HS code for L-tryptophan (CAS 73-22-3) is 2933.99.
2933.99
2933 99 80
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
(2S)-2-amino-3-(1H-indol-3-yl)propanoic acid
QIVBCDIJIAJPQS-VIFPVBQESA-N
C1=CC=C2C(=C1)C(=CN2)C[C@@H](C(=O)O)N
Sourcing L-tryptophan?
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