Frequently Asked Questions

Follow the handling and storage instructions for the selected product and lot. Stability depends on the sequence, formulation, container and supporting data; do not assume a universal shelf life or reconstituted-solution stability.

They indicate the amino-acid residue range of the parent protein the peptide corresponds to. For example, (7-26) is the fragment spanning residues 7 through 26.

Sequence length, disulfide connectivity, modification and scale are reviewed for each project before synthesis feasibility and any delivery commitment are confirmed. Send the proposed sequence and target specification for review.

Appearance alone cannot confirm the identity or amount of material. Check the product label and applicable lot documents, and contact the team before opening the vial if the contents appear inconsistent with the order.

The public catalog groups currently available research materials by product family. If the required sequence is not listed, submit the sequence, scale, modification and specification for a feasibility review.

The feasible minimum and production scale depend on the sequence, modifications, purification and analytical scope. State the requested quantity and specifications for a project-specific quotation.

Send the requested label, attachment position, sequence, scale and analytical requirements. Availability and any specialist labeling capability are confirmed only after technical and destination review.

Extraction removes proteins and matrix components that interfere with assays, concentrating the target peptide to improve sensitivity and reproducibility.

The collection tube, inhibitor, extraction method and acceptance criteria depend on the analyte and assay. Follow a validated method or the selected kit protocol rather than a universal materials list.

Use the collection, processing and storage conditions validated for the specific analyte and assay. Record any temperature excursion and confirm its impact against applicable stability data.

No single frozen-storage period applies to all peptide analytes and sample matrices. Use the stability window established for the relevant method and specimen.

The document set varies by product, lot and project. Request the applicable specification, available analytical records and any safety or handling documents before accepting a quotation.

Purity targets and analytical methods vary by product and project. Request the current specification and lot-specific result where available; an HPLC area result is not the same as peptide mass fraction.

Methods and release criteria vary by material and intended project. The written specification and available lot records should identify the applicable tests, methods, acceptance limits and measured results.

Example or lot-specific documents may be requested. Availability of documents or physical evaluation quantities is confirmed for the selected product before quotation.

Do not assume equivalence across lots. Compare the applicable specification and lot-specific results, and request change-control or traceability information where it is relevant to the project.

Minimum order quantity and available scale are confirmed for the selected product, variant and destination in the written quotation.

Current availability, the dispatch estimate, carrier options and destination-specific transit estimates are confirmed before quotation. Customs, import clearance and carrier timing cannot be guaranteed.

Packaging and transport conditions are selected for the product, route and supporting stability information, then confirmed before dispatch. Do not assume every peptide tolerates an ambient-temperature transit.

Available payment methods and terms are confirmed by the sales team in the written quotation for the buyer and destination.

Check the label and product- or lot-specific handling instructions on arrival. Contact the team about any package damage, temperature excursion or missing storage information before use.

The dispatch estimate for a catalog or custom peptide is confirmed after the selected material, scale, specification and current availability have been reviewed.

Labeling feasibility and lead time depend on the requested label, incorporation position, scale and analytical requirements; the estimate is confirmed during technical review.

Current availability and the dispatch estimate for a selected kit are confirmed before quotation.

Custom-synthesis lead time is quoted after feasibility review because sequence length, modifications, scale, purification and analytical requirements can materially change the schedule.

Current availability and the dispatch estimate are confirmed for the selected product before quotation.

NHD supplies pharmaceutical companies, research institutions, cosmetic manufacturers, biotech firms and CROs. Products are for research, development and manufacturing use — not for direct human use.

Account approval requires business verification. Products are supplied for research, development and manufacturing use only.