Yantai BioBestseller
Retatrutide
spec: 5mg / 10mg / 15mg / 20mg / 30mg vials
Triple agonist on GIP, GLP-1 and glucagon receptors. The most requested sequence in our catalogue.
≥99% HPLCDetails →
We synthesise peptides on our own SPPS line and verify every batch with HPLC and mass spectrometry. Most lots exceed 99% purity. An independent laboratory confirms it, and the certificate travels with your order.
These are the sequences we run most often. Larger catalogues, on-demand sequences and bulk quantities are available on request — send us the target and we will quote it.
Triple agonist on GIP, GLP-1 and glucagon receptors. The most requested sequence in our catalogue.
Dual GIP/GLP-1 receptor agonist. Consistently among our highest-volume research peptides.
GLP-1 receptor agonist, produced continuously so stock items ship same or next day.
Your sequence, your purity, your modifications. We quote mg-to-kg projects as standard.
Solid-phase synthesis with Fmoc chemistry, HPLC purification to ≥98%, and lyophilisation for storage stability. Nothing leaves the line until an outside laboratory has signed off on the batch.
Fmoc-based SPPS on validated protocols, routine up to 60 residues.
Most lots above 99%. Independently confirmed by an outside laboratory.
Molecular weight confirmed on every lot before it is released.
Chromatograms sent before dispatch. Missing COA? We reship at our cost.
WhatsApp or email. Tell us the sequence, quantity and destination country.
50% deposit for new accounts, 30% on repeat orders. Wire, USDT or Wise.
HPLC and mass spec complete, COA issued, tracking number sent in real time.
Tracked shipping, 60-day reship cover, and 10% off repeat orders.
Recent third-party certificates from actual batches. Select any report to view it full size.
Know exactly what arrives with an order: purity result, chromatogram, mass spec identity and the third-party QC stamp.
📄 View sample COAYantai Bio began in a small lab in Yantai, China with three people and a single synthesis instrument. Twelve thousand vials later, the operating rule has not changed: every batch goes to an independent laboratory, every order includes a certificate of analysis, and every shipment carries a real tracking number.
If a shipment is held by customs, lost in transit or arrives incorrect, we reship free within 60 days. No forms, no argument. We have honoured it every time.
We tested it against the certificate at our own facility and the purity matched exactly. It has become our default source for retatrutide.
Our bulk order arrived in eight days, packaging clean and discreet. We will reorder against our quarterly stock.
WhatsApp replies are fast and direct, and the custom synthesis came out exactly to specification. Professional service throughout.
Every product is ≥98% pure by HPLC and most batches exceed 99%. Each order ships with a certificate of analysis showing the measured result for that specific batch, not a catalogue figure.
We ship worldwide, including the USA, EU, UK, Canada, Australia and most of Asia. A few jurisdictions restrict research peptide imports — we confirm feasibility before you commit to an order.
Outer packaging is plain and unmarked, and no product description appears on the shipping label. Vials are sealed in sterile bags with cold-chain handling considered for each destination.
No fixed minimum. Single vials are available for evaluation, and bulk pricing starts at ten vials of the same sequence. Larger quantities are quoted individually.
Yes — from milligram to kilogram scale. Send the target sequence, the purity you need and any modifications such as acetylation, amidation or fluorescent labels, and we will quote feasibility and timeline.
Send us the tracking number and we will work the case with you. This service is included with every order at no additional cost.
Bank transfer in USD, EUR or GBP, USDT on TRC-20 and ERC-20, and Wise. New accounts pay 50% upfront, repeat orders 30%. Net-30 terms are available to wholesale accounts after three verified orders.
Stock items dispatch within 24–48 hours of cleared payment. Standard delivery is 5–7 days to the US, EU and UK, and 7–10 days to Australia and Asia. DHL and FedEx are available at extra cost.
Yes. We offer one- or two-vial evaluation packs for new researchers. The sample fee and shipping are credited against your first bulk order.
If a parcel is seized by customs, destroyed in transit or arrives damaged, send us the tracking number and we reship free. Cover runs for 60 days from the dispatch date, once per account.
We reply to most inquiries within 12 hours. WhatsApp is the fastest route.
Send us the sequences, quantities and destination country. We will come back with availability, purity and a shipping estimate, usually within 12 hours.
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