Molekula
L-Leucine
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-Leucine is an essential branched-chain amino acid used in nutritional supplements, cell culture media, and metabolic research. It plays a key role in protein synthesis and muscle recovery. Available in powder form with a purity of ≥98%, CAS number 61-90-5, molecular formula C6H13NO2, and molecular weight 131.17 g/mol. Stored at ambient temperature. Molekula supplies L-Leucine 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
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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100 g — £30.90 per pack ex VAT · £37.08 inc. VAT
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1 kg — £107.50 per pack ex VAT · £129.00 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 or almost white crystalline powder or shiny flakes |
| Impurity | ≤2.0% |
| Specific rotation | +14.9 to +17.3° |
| Identification | Conforms to reference |
| pH | 5.5-7.0 |
| Loss on Drying | ≤0.2% |
| Chloride (Cl-) | ≤0.05% |
| Assay | 98.5 to 101.5% |
| Residue on Ignition | ≤0.4% |
| Iron (Fe) | ≤30ppm |
| Sulphates (SO4)(2-) | ≤0.03% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | White crystals |
| Melting Point | 293 °C |
| Density | 1.293 g/cm³ at 18 °C |
| Water Solubility | 21.5 g/L at 25 °C |
| Solubility (other solvents) | Soluble in water, acetic acid, dilute HCl, and alkaline hydroxides and carbonates |
| Vapour Pressure | 0.00000001 mmHg |
| pKa | pKa = 2.35 (at 13 °C) |
| log P (octanol/water) | -1.52 |
Source: PubChem CID 6106 (HSDB, DrugBank, Joint FAO/WHO Expert Committee on Food Additives (JECFA), Haz-Map)
Identification
| Property | Value |
|---|---|
| SKU | 17954292 |
| CAS Number | 61-90-5 |
| IUPAC Name | (2S)-2-amino-4-methylpentanoic acid |
| EC Number | 200-522-0 |
| Molecular Formula | C6H13NO2 |
| Molecular Weight | 131.17 |
| Exact Mass | 131.0946 |
| SMILES | CC(C)C[C@@H](C(=O)O)N |
| InChIKey | ROHFNLRQFUQHCH-YFKPBYRVSA-N |
| InChI | InChI=1S/C6H13NO2/c1-4(2)3-5(7)6(8)9/h4-5H,3,7H2,1-2H3,(H,8,9)/t5-/m0/s1 |
| PubChem CID | 6106 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 29224949 |
| Tariff Code | 2922498590 |
Safety & GHS
Precautionary statements
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P264 Wash thoroughly after handling
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P403+233 Store in a well ventilated place. Keep container tightly closed
- P501 Dispose of contents/container to an approved waste disposal plant
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, 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-4-methylpentanoic acid
- (S)-2-Amino-4-methylpentanoic acid
- (S)-2-Amino-4-methylvaleric acid
- (S)-Leucine
- L-alpha-Aminoisocaproic acid
- Leucin
- Leucina
- leucine
- LEUCINE, L-
- Leucinum
Frequently asked questions
What is L-Leucine used for?
L-Leucine is primarily used in nutritional supplements and research applications as an essential branched-chain amino acid for protein synthesis and muscle recovery.
What is the chemical formula and molecular weight of L-Leucine?
The chemical formula is C6H13NO2 and the molecular weight is 131.17 g/mol.
How should L-Leucine be stored?
L-Leucine should be stored at ambient temperature, protected from moisture and light.
What grade of L-Leucine is available?
Molekula supplies L-Leucine in research grade, suitable for laboratory and analytical use.
Can Molekula supply L-Leucine in bulk?
Yes, Molekula can supply L-Leucine in bulk quantities; please contact our sales team for pricing and availability.
What documentation comes with an order of L-Leucine?
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.