L-Lysine HCl should be selected according to application, grade, assay, specific rotation, particle size, bulk density, impurities, microbiology and technical documentation.
A product labelled only “L-Lysine 99%” is not a complete purchasing specification. Buyers should confirm whether the product is L-Lysine HCl, which grade applies, how the assay is measured and whether the batch documents support the intended use.
1. What Is L-Lysine HCl?
L-Lysine HCl is the hydrochloride salt form of L-Lysine. It is supplied as a crystalline powder and may be used in supplement, sports-nutrition, food and pharmaceutical formulation development.
L-Lysine and L-Lysine HCl should be listed as separate ingredients in a purchase specification because they have different chemical forms and may have different assay, chloride and formulation properties.
2. Food, Nutraceutical and Pharmaceutical Grade Selection
| Grade | Potential Application | Main Buyer Focus |
|---|---|---|
| Food Grade | Functional foods, beverages and nutritional formulations | Identity, assay, heavy metals, microbiology and food-use documents |
| Nutraceutical Grade | Capsules, tablets, powders and sports-nutrition products | Assay, moisture, flowability, particle size and batch consistency |
| Pharmaceutical Grade | Pharmaceutical development and selected regulated applications | Compendial specification, impurities, microbiology and site documentation |
Pharmaceutical or injectable use requires separate qualification. A supplier’s use of the words “pharmaceutical grade” does not by itself establish regulatory approval for every pharmaceutical application.
3. Assay, Identity and Specific Rotation
A complete L-Lysine HCl specification should identify the chemical form, assay method, actual batch result and specific rotation where required.
Buyers should request:
- Identity test.
- Assay and analytical method.
- Specific rotation and test conditions.
- Chloride content where applicable.
- Moisture or loss on drying.
- Residue on ignition.
- Related amino-acid impurities.
A general statement such as “high purity amino acid” should not replace a numerical batch-specific test result.
4. Particle Size and Bulk Density
Particle size and bulk density influence blending, filling, dissolution and production efficiency.
- Particle-size range or mesh.
- Bulk density.
- Flowability.
- Moisture and caking tendency.
- Dissolution or dispersion.
- Compatibility with other amino acids and excipients.
A particle size suitable for capsules may not be ideal for tablet compression, powdered beverages or high-speed blending. The RFQ should include the intended production process.
5. Heavy Metals, Microbiology and Other Safety Tests
Safety testing should match the product grade, application and destination market.
- Lead, arsenic, cadmium and mercury.
- Total plate count.
- Yeast and mould.
- Specified pathogens.
- Residual solvents where applicable.
- Endotoxin for relevant pharmaceutical applications.
- Moisture and storage conditions.
Buyers should request numeric limits and actual results. A COA that only says “complies” without showing the specification and result may be insufficient for quality approval.
6. L-Lysine HCl for Different Applications
Supplements and Sports Nutrition
Review assay, taste, solubility, particle size, flowability, moisture and compatibility with other amino acids, minerals and botanical ingredients.
Tablets and Capsules
Review particle size, bulk density, blend uniformity, compression behaviour and finished-dose consistency.
Functional Beverages
Test dissolution, taste, pH, clarity, sedimentation and stability in the complete beverage formula.
Pharmaceutical Development
Confirm the exact grade, specification, impurity profile, microbiology, endotoxin where applicable, packaging, manufacturing site and regulatory documentation before use.
7. What Should Appear on an L-Lysine HCl COA?
A reliable COA should connect the actual batch with its identity, assay, test method, specification limit and result.
- Product name and CAS number.
- Batch or lot number.
- Identity result.
- Assay and analytical method.
- Specific rotation where required.
- Chloride content where relevant.
- Loss on drying or moisture.
- Residue on ignition.
- Related substances or impurities.
- Heavy-metal results.
- Microbiological results.
- Endotoxin where applicable.
- Particle size and bulk density where included in the specification.
- Manufacturing date and expiry or retest date.
- Storage and packaging information.
8. Buyer Qualification Checklist
- Define the intended application and grade.
- Confirm the chemical identity and CAS number.
- Review assay, identity and specific-rotation methods.
- Check particle size, bulk density and flowability.
- Review heavy metals, residual solvents and microbiology.
- Confirm endotoxin requirements for pharmaceutical applications.
- Request a batch-specific COA.
- Review storage, packaging and shelf life.
- Confirm applicable compendial and market documents.
- Confirm MOQ, lead time and delivery terms.
Frequently Asked Questions
What is the difference between L-Lysine and L-Lysine HCl?
L-Lysine HCl is the hydrochloride salt form of L-Lysine. The two materials have different chemical identities and should be specified separately in purchasing and quality documents.
Why does particle size matter for L-Lysine HCl?
Particle size can affect flowability, bulk density, blending, filling, dissolution and tablet processing. The buyer should select the range according to the production equipment.
What should appear on an L-Lysine HCl COA?
The COA should include identity, batch number, assay, test method, specific rotation where required, moisture, impurities, heavy metals, microbiology and applicable endotoxin results.
Can L-Lysine HCl be used in sports-nutrition products?
Some grades may be suitable for sports-nutrition formulations. Buyers should review assay, taste, solubility, particle size, contaminants and destination-market requirements.
Does pharmaceutical-grade L-Lysine HCl automatically qualify for injectable use?
No. Injectable or parenteral use requires a separate review of grade, endotoxin, microbiology, impurities, manufacturing controls, packaging and applicable regulatory documentation.
Can Blueeyes Bio provide L-Lysine HCl technical documents?
Blueeyes Bio can discuss available L-Lysine HCl grades, specifications, technical documents and commercial quantities according to the buyer’s application and destination market.
