Molekula
L-Tryptophan
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 1999 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
L-Tryptophan is an essential amino acid and precursor to serotonin and melatonin, widely used in nutritional supplements, pharmaceuticals, and sleep aids for its mood-regulating and relaxation properties. This white crystalline powder has a CAS number of 73-22-3, molecular formula C11H12N2O2, and a molecular weight of 204.23. It is stable at ambient temperatures and poses no hazardous classification under standard handling. Molekula supplies L-Tryptophan from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | White powder |
| Identification | Conforms to reference |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Odour | Odorless |
| Melting Point | 282 °C (decomposes) |
| Solubility (other solvents) | Slightly soluble in acetic acid, ethanol; insoluble in ethyl ether |
| pKa | pKa = 7.38 (at 25 °C) |
| log P (octanol/water) | -1.06 |
Source: PubChem CID 6305 (HSDB, DrugBank)
Identification
| Property | Value |
|---|---|
| SKU | 90031530 |
| CAS Number | 73-22-3 |
| IUPAC Name | (2S)-2-amino-3-(1H-indol-3-yl)propanoic acid |
| EC Number | 200-795-6 |
| Molecular Formula | C11H12N2O2 |
| Molecular Weight | 204.23 |
| Exact Mass | 204.0899 |
| SMILES | C1=CC=C2C(=C1)C(=CN2)C[C@@H](C(=O)O)N |
| InChIKey | QIVBCDIJIAJPQS-VIFPVBQESA-N |
| InChI | InChI=1S/C11H12N2O2/c12-9(11(14)15)5-7-6-13-10-4-2-1-3-8(7)10/h1-4,6,9,13H,5,12H2,(H,14,15)/t9-/m0/s1 |
| PubChem CID | 6305 |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| HTS Code | 29339975 |
| Tariff Code | 2933998090 |
Safety & GHS
Precautionary statements
- P264 Wash thoroughly after handling
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P308+313 IF exposed or concerned: Get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Portuguese, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Quality certificates
Molekula Group is certified to ISO 9001:2015 (quality) and ISO 14001:2015 (environmental management), audited by a UKAS-accredited body. Both certificates are valid to 17 May 2028.
Synonyms
- (2S)-2-amino-3-(1H-indol-3-yl)propanoic acid
- (S)-Tryptophan
- Ardeytropin
- Indole-3-alanine
- L-Tryptophane
- Pacitron
- trofan
- tryptacin
- tryptophan
- Tryptophane
Frequently asked questions
What is L-Tryptophan commonly used for?
L-Tryptophan is primarily used as a dietary supplement for sleep regulation, mood enhancement, and as a precursor to serotonin and melatonin. It’s also used in protein synthesis and research applications.
What is the chemical formula and molecular weight of L-Tryptophan?
The chemical formula is C₁₁H₁₂N₂O₂, and the molecular weight is 204.23 g/mol.
How should L-Tryptophan be stored?
Store L-Tryptophan in a tightly sealed container at ambient temperature, away from moisture and direct sunlight.
What grades or purities of L-Tryptophan does Molekula supply?
Molekula's L-Tryptophan is specified as a white powder with identification conforming to reference. Please contact Molekula for further grade or purity details.
Can Molekula supply L-Tryptophan in bulk quantities?
Yes, Molekula can supply L-Tryptophan in bulk quantities, with flexible packaging options (drums, bags, or custom solutions).
What documentation comes with an order of L-Tryptophan?
Each order includes a Certificate of Analysis (CoA), Material Safety Data Sheet (MSDS), and batch-specific documentation for traceability.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.