Frequently Asked Questions

There is no strict minimum order quantity for catalog products. Standard vial sizes start from 5 mg. For custom synthesis, minimums depend on sequence length and modification requirements — typically starting from 5 mg crude. Contact us for project-specific pricing.

You can place an order by submitting an inquiry through our website contact form, sending an email to info@kerisitepeptide.com, or reaching us via WhatsApp. Our team will confirm availability, provide pricing, and guide you through payment.

Orders for in-stock catalog products can be modified or cancelled within 12 hours of placement, provided they haven't been dispatched. Custom synthesis orders cannot be cancelled once production has begun.

Yes. We offer small-quantity sample orders starting from 5 mg for most catalog products.

Send your product list, required quantities, and shipping destination to info@kerisitepeptide.com or use our contact form. We respond within 24 hours.

In-stock products typically ship within 1–2 business days. Delivery: 3–5 days Asia-Pacific, 5–7 days NA/Europe, 7–12 days other regions. All via temperature-controlled cold-chain logistics.

We ship to 35+ countries across North America, Europe, Asia-Pacific, the Middle East, and South America via dual warehouses in China and the US.

Lyophilized, sealed under inert gas, placed in labeled vials with batch tracking codes, packed in insulated containers with dry ice.

Yes. Once your order ships, you'll receive an email with tracking number and carrier details.

Contact us within 7 days of expected delivery with photos. We'll file a carrier claim and arrange a replacement at no cost. All shipments are insured.

Standard purity (≥95%) and premium purity (≥98%). Our average purity exceeds 99%.

Yes. Every order ships with a COA including HPLC chromatogram data, MS confirmation, purity percentage, and batch number.

Analytical HPLC for purity, mass spectrometry (ESI-MS or MALDI-TOF) for molecular weight. Amino acid analysis and endotoxin testing available on request.

Lyophilized peptides at -20°C or below for long-term storage. Reconstituted solutions aliquoted at -80°C. Avoid repeated freeze-thaw cycles.

Absolutely. Full custom synthesis using Fmoc SPPS for sequences up to 100+ residues.

Non-standard amino acids, N-terminal acetylation, C-terminal amidation, PEGylation, cyclization, fluorescent labeling, biotin conjugation, fatty acid conjugation, and phosphorylation.

Standard: 2–4 weeks. Rush orders (1–2 weeks) available for straightforward sequences at additional fee.

Standard capability covers up to 100 residues. For longer, we use fragment condensation and native chemical ligation.

Wire transfer (T/T), PayPal, cryptocurrency (BTC, USDT, USDC), Wise, and Alibaba Trade Assurance. Institutional POs and net-30 terms available.

Yes. Volume-based pricing scales with order size and frequency. Distributor partnership programs available.

Yes. We work with universities, research institutes, and corporate labs. Net-30 terms after credit evaluation.

Yes. Commercial invoice with every order. Proforma invoices, customs documentation, and receipts available.

Start with sterile water, DMSO, or dilute acetic acid depending on solubility profile. Gently swirl — do not vortex aggressively.

Lyophilized at -20°C: 2–3 years. Reconstituted: 1–4 weeks at 4°C, months at -80°C in aliquots.

Yes. Guidance on peptide selection, dosage, solubility optimization, storage protocols, and sequence design consultation.