What should a lab check before buying a peptide? Look at the purity, the test reports and the paperwork.
Retatrutide API is a peptide ingredient that is still under study. It works on three receptors: GLP-1, GIP and glucagon. It is a white powder, sold only for lab research.
Its CAS number is 2381089-83-2. Its purity is at least 98%. Packs come in sizes from 1g to 1kg. Sichuan Pengting Technology Co., Ltd. supplies it.
Retatrutide API Specs Buyers Should Check First
The main specs are the CAS number, the purity and the form. The CAS number is 2381089-83-2. The purity is at least 98%. The form is a white powder. Pengting lists these on its product page.
Match each one with the batch papers before you order. If one does not match, stop and ask the supplier. Check the pack size too. It goes from 1g to 1kg. Make sure the use is research only. Ask for the proof in writing.
Product Specifications
| Field | Value |
| Product name | Retatrutide |
| CAS No. | 2381089-83-2 |
| Purity | ≥98% |
| Appearance | White powder |
| Packing (powder) | 1g to 1kg |
| Price | On request |
| Use | Research use only (RUO) |
The retatrutide raw powder is lyophilized, often known as freeze-dried. The page states it is stable and dissolves nicely. It’s also simple to rehydrate or blend back into a drink. Each batch is analyzed for purity by HPLC and MS.
Triple Agonist Peptide: GLP-1, GIP and Glucagon
A triple agonist peptide is a single molecule that activates three receptors. Retatrutide targets the GLP-1 receptor, the GIP receptor, and the glucagon receptor (GCGR). They are all part of a distinct hormone signal.
It is used by labs for multi-target metabolic studies. This signifies more than one target at a time. Obesity. Type 2 diabetes. Metabolic syndrome and NAFLD. The site lists NAFLD means non-alcoholic fatty liver disease.
The peptide is under research yet. It is made for lab models only.
Retatrutide vs Semaglutide vs Tirzepatide
Retatrutide acts on three receptors. Tirzepatide works on two of them. Semaglutide operates on one receptor.
Receptor Coverage and Lab Role
| Peptide | Receptors | Lab role |
| Semaglutide | GLP-1 | Single-pathway baseline and control |
| Tirzepatide | GLP-1 and GIP | Dual-pathway reference |
| Retatrutide | GLP-1, GIP and glucagon | Multi-target, broader receptor coverage |
Labs commonly utilize semaglutide as a comparator in the beginning. They use tirzepatide as the two-receptor reference.
Who Uses Retatrutide in the Lab?
The primary consumers are pharmaceutical R&D facilities. Then they play around with how to combine it and how to provide it before they get to greater studies.
It is also used by biotech start-ups and contract research organizations (CROs). To do their work on metabolic disorders they frequently have to make bespoke peptides. Pengting ships between 1g and 1kg. Custom packaging, thorough documentation, and fast turnarounds are available.
API Powder vs Finished Medicine
An API is the active ingredient before it is made into a dose. “This is raw material for the lab. This is not a product for humans.
Retatrutide is yet investigational. Research-grade powder is not manufactured, tested or certified for medical treatment, medical testing or use on humans.
From Peptide Chain to Retatrutide Raw Powder
The powder is made in four steps:
- Solid-phase peptide synthesis (SPPS) builds the chain on a resin. It adds one amino acid at a time.
- Lipidation adds fatty acid groups to the chain through a linker.
- Preparative reverse-phase HPLC purifies the crude (raw) peptide.
- Lyophilization freeze-dries the purified peptide into white powder.
Packing comes last. Pengting uses sealed containers that do not react with the powder. They protect it from moisture and oxidation, which is damage from air. A desiccant (drying agent) or inert gas may be added if the powder needs it. Every package has clear batch information.
HPLC Purity: What the Numbers Mean
HPLC Purity – The percentage of the sample that is the desired peptide. It is expressed as a percent. The assay discriminates the target peptide from by-products. It then plots a chromatogram, which is a line graph of the result.
A percentage by itself doesn’t prove anything. Mass spectrometry (MS) confirms what the peptide is. It also checks the molecular weight. When you get an MS report, a 98% or higher result implies more. Each result has its place on a peptide COA.
Reading a COA Before You Place an Order
A COA is a signed report for a single batch. It indicates what was lab-tested. The Pengting COA has storage history, moisture content, appearance, residual solvents, and purity. It is signed by quality control (QC).
The whole set comprises 4 things. They are the COA, HPLC chromatogram, MS report, and MSDS. You may acquire samples before you purchase. If needed, endotoxin (LAL) testing is also offered.
Red flags are easy to miss. Look for testing gaps in COA fields and common COA red flags.
GMP Documentation and Factory Credentials
Sichuan Pengting Technology Co., Ltd. was founded in 2021 and is based in Sichuan. It focuses on R&D, custom work and large-scale production of peptide APIs. Its partner manufacturing base covers 6,500 square meters. The team has 5+ PhD R&D engineers. The catalog holds over a hundred raw materials.
GMP documentation needs a careful read. The company’s papers refer to ICH Q7 principles as an internal guide. It holds ISO 9001. It works to GMP standards through its manufacturing partner.
The retatrutide page says plainly that the company has no cGMP certification and no US DMF. Buyers who need cGMP-grade material should ask about qualified partner options. The company tells its story on its About us page.
Bulk Supply, Pack Sizes and Delivery Cycle
Packs come in sizes from 1g to 1kg. Bulk supply prices start at 100g. The price depends on purity grade, order size and custom needs. Small orders cost more per gram than bulk orders. The company accepts all major currencies. You can get a sample before a volume order.
The company sells to verified business clients only. It checks your institution before it sends a quote. Shipping terms are EXW or FOB Shenzhen or Shanghai. Your own forwarder handles customs.
Delivery to Europe and America takes 15 to 20 days. Southeast Asia takes 7 to 10 days. Urgent orders ship within 72 hours. Technical support replies within 24 hours. The team can help with COA data, solubility and product questions.
Storage, Handling and Cold Chain Shipping
The powder keeps best at -20°C in a dry, airtight container. Heat, light and moisture can harm it. A dry container helps stop hydrolysis, which is the breakdown of peptide bonds.
Be careful when you reconstitute the powder. If you use sterile water or an acetic acid solution, follow the rules for that batch on the COA. Cold chain shipments use approved thermal packaging.
Storage Conditions
| Condition | Instruction |
| Long term | -20°C, dry, airtight |
| Short term | 2 to 8°C, up to 30 days |
| Light | Amber vials or foil wrap |
| Avoid | Repeated freeze-thaw cycles |
| After reconstitution | Use immediately, or store at 4°C for up to 7 days |
| Shipping | Cold chain, dry ice or gel packs, with temperature data loggers |
RUO Boundaries: Who Can Buy and Why
The product is For Research Use Only. It is “Not for human or veterinary applications.” All orders need the RUO designation.
The corporation sells to laboratories and companies, not to people. Its records further state that the item is not developed, tested or certified for medical treatment, medical testing or usage on humans. Any lab that buys research use only peptides follows the same rule.
A Sourcing Checklist for Retatrutide Buyers
Eight Things to Ask For
- CAS number 2381089-83-2 in the paper.
- HPLC purity of at least 98% with chromatogram.
- An MS report showing what the peptide is.
- A COA that has the same batch number as the packaging.
- The MSDS.
- Sample before a major order.
- How they keep the powder cold in transit.
- A simple comment about the caliber of the document.
Common Mistakes When Buying Peptide Powder
Most mistakes start with missing paperwork.
Five Mistakes to Avoid
- Trusting a purity number with no chromatogram to back it up.
- Skipping the MS report, which shows what the peptide is.
- Accepting a report with a batch number that does not match the package label.
- Forgetting the cold chain during shipping.
- Assuming every supplier holds cGMP status. Ask for a clear answer in writing.
A short call with the supplier’s technical team can clear up most doubts before you order.
FAQs
What is retatrutide and how does it work?
Retatrutide is a peptide that is still in the research phase. It turns on three receptors: GLP-1, GIP, and glucagon. That’s why it’s termed a triple agonist. Labs employ it in metabolic research models, such as obesity and type 2 diabetes investigations.
Is retatrutide approved for human use?
No. The site refers to it as experimental and currently under examination. It is sold for research use only. Drugs.com says retatrutide is not FDA authorized. It also states Eli Lilly expects to apply for FDA clearance in the first quarter of 2027.
What purity should retatrutide API have?
Purity: min. 98 % (HPLC). The MS report indicates what the peptide is. Each batch includes COA.
How is retatrutide API stored and shipped?
For the long term, store it at -20°C. For short use, store it at 2 to 8°C for up to 30 days. Do not freeze and thaw it again and again. Orders ship in cold chain packaging.
Can an individual buy this material?
No. The company sells to labs and businesses only. It checks the institution before it sends a quote.
Conclusion
Before you pay, always check the CAS number, the HPLC result, the MS report and the batch papers. Store the powder at -20°C. Use it for research only, as the label says.
Sichuan Pengting Technology Co., Ltd. suits buyers who want clear specs and honest papers. It says plainly what it has and what it does not have. It also gives out samples before a volume order. Ask about the cold chain, and ask for the full document pack first.
