Frequently asked
questions.

Yes. All purchases require verification of researcher or institutional credentials. We accept orders from academic institutions, licensed research facilities, pharmaceutical companies, and credentialed independent researchers. We reserve the right to decline orders that cannot be verified or that fall outside appropriate research contexts.

We currently accept cryptocurrency (100+ coins via NOWPayments) and direct invoice payment via Cash App or Zelle. When you choose “Pay by Invoice” at checkout, payment instructions are shown immediately on the confirmation page, and we ship within 72 hours of receiving funds. Institutional purchase orders and net-30 terms are available on request — contact us before placing your first order.

Yes. Volume pricing is available for orders exceeding 50mg of any single peptide, and institutional agreements are available for labs ordering regularly. Contact us to discuss your needs and we'll work out a pricing structure that works for your research program.

This refers to the percentage of the target peptide as measured by HPLC peak area at 214nm (or 220nm for peptides lacking aromatic residues). A ≥98% purity designation means that at least 98% of the UV-absorbing material in the sample is the desired sequence. We report the actual measured purity on each Certificate of Analysis.

Yes — always. Every shipment includes a batch-specific Certificate of Analysis (CoA) with: HPLC chromatogram and purity percentage, MS confirmation of molecular weight (ESI-MS or MALDI-TOF), calculated and observed molecular weight, lot number and synthesis date, and storage recommendations. Digital copies are also available on request.

Every batch goes through: (1) in-process monitoring during SPPS to track coupling efficiency, (2) preparative HPLC purification targeting ≥95% minimum (with higher grades available), (3) analytical HPLC to confirm final purity, and (4) mass spectrometry to verify the correct molecular weight and structural integrity. Batches that fail any step are discarded — not relabeled.

Yes. Standard catalog items are typically supplied at ≥98% purity, but ≥99% lots are available for most sequences at a modest premium. If your research requires a specific purity threshold, note it in your quote request and we'll accommodate where feasible.

All peptides are shipped as lyophilized powder in sealed, clearly labeled vials with lot numbers and the CoA. Orders are packed with appropriate insulating materials. For temperature-sensitive sequences, we ship with dry ice at no additional charge. International orders are shipped with all required customs documentation.

In-stock catalog items ship within 72 hours of order confirmation. Custom synthesis is typically completed in 5–10 business days depending on sequence complexity. Rush processing is available — contact us to discuss your timeline and we'll do our best to accommodate.

As a general rule: store lyophilized peptides at -20°C in a desiccated, dark environment. Avoid repeated freeze-thaw cycles — aliquot before first reconstitution. Specific storage recommendations for each peptide are provided on the CoA. If you're unsure, our team is happy to advise on optimal storage and reconstitution for your specific sequence.

Yes, we ship to most countries worldwide. International orders may be subject to additional import duties, customs fees, or regulatory restrictions depending on the destination country. We provide accurate product descriptions and HS codes on all customs documentation. The buyer is responsible for compliance with local import regulations.

No. All products sold by Stratus Biolabs are strictly for research use only and are not approved, manufactured, tested, or intended for human or veterinary use. They are not pharmaceutical-grade products. Use outside of a proper research context is a violation of our Terms of Sale.

Most catalog items are available as lyophilized powder, which offers the longest shelf life and most stable format for most research applications. Certain peptides can be provided in solution upon request — specify preferred solvent, concentration, and volume when ordering. Additional lead time may apply for solution format.

Yes — as custom orders. We can synthesize peptides with N- or C-terminal modifications including FITC, TAMRA, Cy3/Cy5, biotin, and PEG conjugates. Modification placement and linker chemistry can be specified. Contact us with your sequence and modification requirements for a quote.

To generate an accurate quote for custom synthesis, we'll need: (1) the full peptide sequence in single-letter or three-letter amino acid code, (2) any desired modifications (N/C-terminal caps, unnatural amino acids, disulfide bonds, labels), (3) required quantity in milligrams, and (4) minimum acceptable purity. Email this information to [email protected].

We routinely synthesize peptides from 2 to 50 residues. Sequences above 30–35 residues may require native chemical ligation or other advanced strategies, and lead times and pricing will reflect that complexity. Contact us to discuss your specific sequence and we'll advise on feasibility and approach.

Yes. We have experience incorporating a wide range of non-standard residues including D-amino acids, N-methyl amino acids, beta-amino acids, Aib, ornithine, norleucine, and others. Availability depends on building block sourcing — contact us with your specific requirements and we'll confirm feasibility.

No. Our products are research-grade biochemical reagents, not pharmaceuticals, and are not FDA approved for any therapeutic use. They are sold strictly under research use exemptions and must not be used as drugs, supplements, or in any clinical application without appropriate regulatory approval from the relevant authorities.

By purchasing from Stratus Biolabs, you agree that: products will be used for legitimate research purposes only; you are a qualified researcher or authorized institutional agent; you will handle, store, and dispose of materials in compliance with all applicable local, national, and institutional regulations; and products will not be resold, redistributed, or used in human subjects without appropriate approvals.

Due to the nature of biochemical reagents, we do not accept returns. However, if a product fails to meet the purity specifications stated on the CoA, or if a shipment is damaged in transit, we will replace the product at no cost. Contact us within 7 days of receipt with documentation and we'll resolve the issue promptly.