Molekula
L-Arginine
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-Arginine is a semi-essential amino acid involved in nitrogen metabolism, urea cycle regulation, and nitric oxide synthesis. It is used in nutritional supplements, pharmaceuticals, and research applications. Available in powder form with a purity of ≥98%, CAS number 74-79-3, molecular formula C6H14N4O2, and molecular weight 174.20 g/mol. Store at ambient temperature. Signal word: Warning. Molekula supplies L-Arginine 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.
Often bought together
Pricing & pack sizes
In stock — same-day dispatch
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 — £88.70 per pack ex VAT · £106.44 inc. VAT
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 |
| Loss on Drying | ≤ 0.5% |
| Chromatographic purity | Not more than 0.5% of any individual impurity is found ； Not more than 2.0% of total impurities is found |
| Chloride (Cl-) | ≤ 0.05% |
| Assay | 98.5 - 101.5% |
| Residue on Ignition | ≤ 0.3% |
| Heavy Metals (Pb) | ≤ 0.0015% |
| Iron (Fe) | ≤ 0.003% |
| Identification (IR) | Conforms to reference |
| Sulphates (SO4)(2-) | ≤ 0.03% |
| Specific Rotation [ɑ] D25 | +26.3 to +27.7 |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Base |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Melting Point | 244 °C |
| Water Solubility | 182 g/L at 25 °C |
| Solubility (other solvents) | Insoluble in ethyl ether; slightly soluble in ethanol |
| pKa | pKa = 2.24 (at 0 °C) |
| log P (octanol/water) | -4.20 |
Source: PubChem CID 6322 (HSDB, DrugBank)
Identification
| Property | Value |
|---|---|
| SKU | 28411569 |
| CAS Number | 74-79-3 |
| IUPAC Name | (2S)-2-amino-5-(diaminomethylideneamino)pentanoic acid |
| EC Number | 200-811-1 |
| Molecular Formula | C6H14N4O2 |
| Molecular Weight | 174.20 |
| Exact Mass | 174.1117 |
| SMILES | C(C[C@@H](C(=O)O)N)CN=C(N)N |
| InChIKey | ODKSFYDXXFIFQN-BYPYZUCNSA-N |
| InChI | InChI=1S/C6H14N4O2/c7-4(5(11)12)2-1-3-10-6(8)9/h4H,1-3,7H2,(H,11,12)(H4,8,9,10)/t4-/m0/s1 |
| PubChem CID | 6322 |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| HTS Code | 29252900 |
| Tariff Code | 2925290090 |
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
- P261 Avoid breathing dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P302+352 IF ON SKIN: Wash with soap and water
- 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.
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-5-(diaminomethylideneamino)pentanoic acid
- (S)-2-Amino-5-guanidinopentanoic acid
- 2-amino-5-guanidinovaleric acid
- Arginina
- arginine
- ARGININE, L-
- Argininum
- L-alpha-Amino-delta-guanidinovaleric acid
- L-Arg
- L-Arginin
Frequently asked questions
What is L-Arginine used for?
L-Arginine is commonly used in biochemical research, cell culture media, and as a dietary supplement to support cardiovascular and immune health.
What is the chemical formula and molecular weight of L-Arginine?
The formula is C6H14N4O2 with a molecular weight of 174.20 g/mol.
How should L-Arginine be stored?
Store at ambient temperature, protected from moisture and light.
What grade of L-Arginine does Molekula supply?
Molekula supplies L-Arginine in reagent grade, suitable for laboratory and research applications.
Can Molekula supply L-Arginine in bulk?
Yes, Molekula can supply L-Arginine in bulk quantities—please contact our sales team for pricing and availability.
What documentation comes with an order of L-Arginine?
Each order includes a Certificate of Analysis (CoA) and safety data sheet (SDS) with the shipment.
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.