Molekula
L-Methionine
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
L-Methionine is an essential sulfur-containing amino acid used in nutritional supplements, animal feed, and pharmaceutical formulations. It plays a key role in protein synthesis and metabolic processes. Available in powder form with a molecular weight of 149.21 g/mol, CAS number 63-68-3, and stored at ambient temperatures. Signal word: Warning. Molekula supplies L-Methionine 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
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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1 kg — $147.70 per pack
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 crystals or crystalline powder |
| Heavy metals | ≤ 0.0015% |
| Identification | Meets the requirement |
| pH | 5.6 - 6.1 |
| Loss on Drying | ≤ 0.3% |
| Chloride (Cl-) | ≤ 0.05% |
| Assay | 98.0 - 101.5% |
| Residue on Ignition | ≤ 0.4% |
| Iron (Fe) | ≤ 0.003% |
| Sulphates (SO4)(2-) | ≤ 0.03% |
| Chromotograhic Purity | Not more than 2.0% of total impurities is found |
| Specific Rotation [ɑ] D25 | +22.4° to +24.7° |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Odour | Faint |
| Melting Point | 280-282 °C (decomposes, sealed capillary) |
| Boiling Point | 181 °C (decomposes) |
| Water Solubility | 56.6 g/L at 25 °C |
| Solubility (other solvents) | Soluble in warm dilute alcohol; insoluble in absolute alcohol, ether, petroleum ether, benzene, acetone |
| Vapour Pressure | 0.00000052 mmHg |
| pKa | pKa = 2.28 (at 25 °C) |
| log P (octanol/water) | -1.87 |
Source: PubChem CID 6137 (HSDB, Haz-Map, DrugBank)
Identification
| Property | Value |
|---|---|
| SKU | 11504183 |
| CAS Number | 63-68-3 |
| IUPAC Name | (2S)-2-amino-4-methylsulfanylbutanoic acid |
| EC Number | 200-562-9 |
| Molecular Formula | CH3SCH2CH2CH(NH2)CO2H |
| Molecular Weight | 149.21 |
| Exact Mass | 149.051 |
| SMILES | CSCC[C@@H](C(=O)O)N |
| InChIKey | FFEARJCKVFRZRR-BYPYZUCNSA-N |
| InChI | InChI=1S/C5H11NO2S/c1-9-3-2-4(6)5(7)8/h4H,2-3,6H2,1H3,(H,7,8)/t4-/m0/s1 |
| PubChem CID | 6137 |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| Tariff Code | 29304010 |
Safety & GHS
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Health Hazard
GHS07
Hazard statements
- H315 Causes skin irritation
- H319 Causes serious eye irritation
- H335 May cause respiratory irritation
Precautionary statements
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P303+361 IF ON SKIN (or hair): Remove immediately all contaminated clothing. Rinse with water/shower
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
- 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.
Synonyms
- (S)-2-Amino-4-(methylthio)butanoic acid
- Acimethin
- Cymethion
- h-Met-oh
- L-Methioninum
- Methilanin
- methionine
- metionina
- Neo-methidin
- S-Methionine
Frequently asked questions
What is L-Methionine used for?
L-Methionine is primarily used as an essential amino acid in nutritional supplements, animal feed, and pharmaceuticals due to its role in protein synthesis and methylation processes.
What is the chemical formula and molecular weight of L-Methionine?
The formula is C5H11NO2S and the molecular weight is 149.21 g/mol.
How should L-Methionine be stored?
Store at ambient temperature, protected from moisture and light, in a tightly sealed container.
What grade of L-Methionine does Molekula supply?
Molekula supplies L-Methionine in pharmaceutical and research-grade quality.
Can Molekula supply L-Methionine in bulk?
Yes, Molekula can supply L-Methionine in bulk quantities; please contact our sales team for pricing and availability.
What documentation comes with an order of L-Methionine?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS); additional documentation is available upon request.
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.