Retatrutide 20mg pen
Retatrutide 20mg pen is a 20 mg pre-filled pen research peptide with 99.712% purity by HPLC (batch RE20-0121), supplied with a batch-matched COA, in stock and dispatched from the EU within 24 hours on working days. Pre-filled pen: 3 ml of bacteriostatic water with 20 mg of Retatrutide (6.67 mg/ml).
Limited-time price
- Content
- 20 mg PEN
- Purity
- 99.712%
- COA for this batch
- Included
Number of vials
Batch RE20-0121, tested 30 Jan 2026, 99.712% purity
Only 5 left in stock
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- Dispatched within 24 hours on working days
- Delivery in 1 to 4 working days across the EU and Monaco
- Discreet packaging: plain outer box, no product names or branding on the outside. A neutral billing name on your card statement, no product names.
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What is Retatrutide 20mg pen?
Pre-filled pen: 3 ml of bacteriostatic water with 20 mg of Retatrutide (6.67 mg/ml).
Pre-filled pen: 3 ml of bacteriostatic water with 20 mg of Retatrutide (6.67 mg/ml). Retatrutide is a synthetic single-molecule agonist studied across the GIP, GLP-1 and glucagon receptor systems in cellular and preclinical models. Compatible 31G pen needles are sold separately. For research purposes only, not for human consumption.
Specifications
- Purity
- 99.712%
- Physical Form
- Pre-filled pen
- Pen Size
- 20 mg PEN
- Storage
- -20°C
- Appearance
- White to off-white lyophilized powder
- Shelf Life
- 24 months unopened at -20°C
- Compatible Needles
- Standard 31G pen needles (sold separately)
- Concentration
- 6.67 mg/ml
- Cartridge volume
- 3 ml
What does the COA for this batch show?
Retatrutide
99.712% pureMeasured 22.48 mg vs labelled 20mg PEN.
- Compound tested
- Retatrutide
- Label
- 20mg PEN
- Measured mass
- 22.48 mg
- Purity
- 99.712%
- Batch
- RE20-0121
- Test date
- 30 January 2026
Independent third-party analysis of the batch listed above. For research purposes only.
What is Retatrutide 20mg pen studied for?
Studied in the context of
- Pre-filled pen: 3 ml of bacteriostatic water with 20 mg of Retatrutide (6.67 mg/ml).
- Retatrutide is a synthetic single-molecule agonist studied across the GIP, GLP-1 and glucagon receptor systems in cellular and preclinical models.
- Compatible 31G pen needles are sold separately.
- For research purposes only, not for human consumption.
How is Retatrutide 20mg pen stored and handled?
Storage
Store the pen at -20°C, protected from light. Once reconstituted or in use, refrigerate at 2-8°C and keep the cap on.
Pen needles
Pen needles are not included. Use a fresh standard 31G pen needle for every draw and remove it after use so the cartridge stays sealed.
For research use only
Not for human or veterinary consumption. Handle in accordance with your institution's laboratory safety protocols.
For research purposes only. Not for human consumption.
Reviews
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Reviews cover packaging, delivery and documentation. Products are for laboratory research only; reviews contain no health or use claims.
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Before you order
Related Compounds
Read before you order
All research guides- Retatrutide: What the Current Research ShowsRetatrutide (LY3437943) is an investigational triple receptor agonist studied at the GIP, GLP-1 and glucagon receptors. Published phase 2 work and later reviews describe the mechanism, while long term outcome data is not available. Material supplied by Vitality Peps is for in vitro laboratory research only.7 min read
- How to Store and Handle Research PeptidesLyophilised research peptides are stored in the refrigerator at 2 to 8 °C, or frozen at -20 °C for longer storage, sealed and protected from light. After reconstitution with [bacteriostatic water](/product/bacteriostatic-water-10ml) the solution is kept refrigerated, never shaken, and never refrozen.5 min read
- How to Read a Peptide COA (Certificate of Analysis)A peptide certificate of analysis shows what an independent laboratory found in one specific batch: identity confirmed by mass spectrometry, purity measured by HPLC, and the measured quantity against the labelled amount. Read it by checking the batch reference against your vial first, then the identity result, then the purity figure and the test date.6 min read
- Semaglutide vs Tirzepatide vs Retatrutide: A Research ComparisonSemaglutide activates the GLP-1 receptor and has the most extensive evidence base, including cardiovascular outcomes data from the SELECT trial. Tirzepatide adds GIP receptor agonism and reported greater weight reduction with a generally milder gastrointestinal profile. Retatrutide uniquely engages the glucagon receptor alongside GLP-1 and GIP and reported the largest reductions observed to date, on a less mature evidence base. All three share gastrointestinal adverse events driven by GLP-1 activity. Material supplied by Vitality Peps is for in vitro laboratory research only.12 min read
- What your vial should look likeA sealed research peptide vial normally holds a white to off-white lyophilized cake or powder under an intact stopper and crimp cap. Pre-filled pens and nasal spray kits arrive sealed, with their documented appearance on the product page. Appearance never proves identity or purity; the COA for the batch does.4 min read
References and further reading
Published literature about this compound, listed for context only. Nothing here describes a use in humans.
- 1.Wilding et al. (2021). Once-weekly semaglutide in adults with overweight or obesity. NEJM. PMID: 33567185 (pubmed.ncbi.nlm.nih.gov)
- 2.Singh et al. (2021). Wegovy (semaglutide): a new weight loss drug. J Investig Med. PMID: 34706925 (pubmed.ncbi.nlm.nih.gov)
- 3.Jastreboff et al. (2022). Tirzepatide once weekly for the treatment of obesity. NEJM. PMID: 35658024 (pubmed.ncbi.nlm.nih.gov)
- 4.Look et al. (2025). Body composition changes with tirzepatide in SURMOUNT-1. Diabetes Obes Metab. PMID: 39996356 (pubmed.ncbi.nlm.nih.gov)
- 5.Jastreboff et al. (2023). Retatrutide for obesity, a phase 2 trial. NEJM. PMID: 37366315 (pubmed.ncbi.nlm.nih.gov)
- 6.Doggrell (2023). Retatrutide showing promise in obesity. Expert Opin Investig Drugs. PMID: 37947489 (pubmed.ncbi.nlm.nih.gov)
1× Retatrutide 20mg pen
€245.95