Summer Stack
Pigmentation research plus entry-level metabolic support.
The melanocortin agonist Melanotan II, 20 mg per click pen, studied in pigmentation research.
A triple GLP-1 / GIP / glucagon agonist in a pre-filled 3 mL click pen. The 20 mg pen for metabolic research.
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Overview
This page sets out exactly what the Summer Stack bundle contains, what each compound is studied for, what the batch documentation reports, and where to confirm current pricing and availability on the live Veyvora en-GB listing.
Check current price and availability in the live offer block below before placing an order; no GBP figure is reproduced here, as the live listing carries the current price.
Veyvora’s Summer Stack is a paired research-pen bundle containing a Melanotan II 20 pen and a Retatrutide 20 pen, supplied for in-vitro laboratory research (Veyvora, 2026). It pairs pigmentation research with entry-level metabolic research and carries a stated 12% saving against the individual pen prices. Both pens are research reagents, each with its own batch certificate of analysis.
| Field | Detail |
|---|---|
| Bundle name | Summer Stack peptides |
| Component 1 | Melanotan II 20 pen (melanocortin pigmentation research format) |
| Component 2 | Retatrutide 20 pen (triple-agonist metabolic research format) |
| Stated saving | 12% versus individual pen prices |
| Storage | 2–8 °C (cold-chain dispatched) |
| Dispatch | 24-hour dispatch stated by Veyvora (2026) |
| Use classification | Laboratory research use only |
| Price | See the live product page |
Veyvora states that each pen is independently assayed, with a certificate of analysis (CoA) linked to the batch number and reporting identity and HPLC purity of at least 98.0% (Veyvora, 2026). That documentation is the record of identity and purity for each pen.
Key Takeaways
- The Summer Stack pairs two analytically separate research reagents — Melanotan II 20 and Retatrutide 20 — each with its own batch CoA.
- Fill volume (3 mL), peptide concentration (6.67 mg/mL) and excipients are read from the lot label and batch CoA for the specific unit.
- Melanotan II is a cyclic α-MSH analogue studied in pigmentation research; retatrutide is a triple GIP/GLP-1/glucagon agonist studied in metabolic research; both are supplied for in-vitro laboratory use.
- The bundle carries a stated 12% saving; confirm pricing, dispatch terms and cold-chain policy on the live Veyvora en-GB listing at the time of purchase.
Exact Bundle Identity
The pen designations “Melanotan II 20” and “Retatrutide 20” are drawn from Veyvora’s catalogue positioning. Read the exact fill volume, peptide concentration, excipients and device specifications from the lot label and the batch CoA for that specific unit. For how the purity figure on that certificate is measured and reported, see how HPLC purity should be interpreted.
Confirm current price and availability in the live offer block before placing an order; no GBP figure is reproduced here, as the live listing carries the current price.
| Field | Detail |
|---|---|
| Bundle name | Summer Stack peptides |
| Component 1 | Melanotan II 20 pen (melanocortin pigmentation research format) |
| Component 2 | Retatrutide 20 pen (triple-agonist metabolic research format) |
| Fill volume | 3 mL |
| Peptide concentration | 6.67 mg/mL per pen (20 mg ÷ 3 mL) |
| Storage | 2–8 °C (cold-chain dispatched) |
| Use classification | Laboratory research use only |
| Price | See the live product page |
Included Components
The Summer Stack contains two research pens, Melanotan II 20 and Retatrutide 20, each supplied as a pre-filled 3 mL / 300-click research pen for in-vitro laboratory use (Veyvora, 2026). Chemically, Melanotan II is a cyclic heptapeptide analogue of α-melanocyte-stimulating hormone (α-MSH), assigned CAS number 121062-08-6. Retatrutide (development code LY3437943) is a single synthetic peptide that acts as an agonist at three receptors, the GIP, GLP-1 and glucagon receptors. Those chemical identities describe the named substances in the published literature and in PubChem; the batch CoA for a specific lot reports the strength and purity of the pen in hand [1].
| Field | Melanotan II 20 Pen | Retatrutide 20 Pen |
|---|---|---|
| Chemical identity | Cyclic α-MSH analogue; CAS 121062-08-6 | Triple GIP/GLP-1/glucagon agonist; LY3437943 |
| Pen designation | Melanotan II 20 | Retatrutide 20 |
| Fill volume | 3 mL | 3 mL |
| Peptide concentration | 6.67 mg/mL (20 mg ÷ 3 mL) | 6.67 mg/mL (20 mg ÷ 3 mL) |
| Excipients / solvent | See batch CoA | See batch CoA |
| Storage | 2–8 °C | 2–8 °C |
| Use classification | In-vitro laboratory research only | In-vitro laboratory research only |
| Individual product page | Confirm from live en-GB listing | Confirm from live en-GB listing |
Researchers who want the mechanistic background on the metabolic component can consult the retatrutide versus tirzepatide comparison for context on the triple-agonist receptor profile.
State of the Evidence
Published chemical and pharmacological records establish the identity and in-vitro behaviour of each substance in its own body of work. Melanotan II is studied as a melanocortin-receptor agonist in pigmentation research; retatrutide is studied as a triple GIP/GLP-1/glucagon receptor agonist in the incretin-class metabolic literature. The two components are analytically separate: the CoA for the Melanotan II 20 pen covers that lot, and the CoA for the Retatrutide 20 pen covers its lot. The two pens are paired as a procurement convenience covering pigmentation and entry-level metabolic research, each with its own evidence base and CoA.
Veyvora’s catalogue positioning states the supplier’s specification and commercial terms; the batch documentation reports purity and identity, with analytical methods validated against ICH Q2(R2) criteria, covering specificity, accuracy, precision and range [1]. A CoA that names the analytical method and the testing laboratory is the document that confirms the composition of the lot.
Batch Documents: Reading the Certificate of Analysis
A batch CoA for each pen in the Summer Stack carries the lot number printed on that pen’s label, names the analytical method used (such as HPLC or mass spectrometry), and states appearance, identity and purity results for that specific lot. Veyvora states that each batch is independently assayed by Asterion and its internal laboratory using HPLC, mass spectrometry and endotoxin assay, with a CoA linked to the batch number and an HPLC purity of at least 98.0% (Veyvora, 2026); read the certificate supplied with your consignment before use. Where the testing laboratory holds United Kingdom Accreditation Service (UKAS) accreditation, that status appears on the certificate itself.
To verify a batch against its CoA, match the lot string on the pen label character-for-character with the string on the certificate before recording any analytical result.
Handling and Storage
Cold-chain integrity is consignment-specific. Veyvora states that research-peptide orders are dispatched under documented cold-chain conditions in an insulated bag with a gel ice pack (Veyvora, 2026); inspect the condition of each delivery on arrival before accepting it.
Handle both pens under the laboratory’s Control of Substances Hazardous to Health (COSHH) assessment, with appropriate containment, personal protective equipment (PPE), spill procedures and waste disposal. For post-delivery storage conditions and stability data relevant to each component, consult research-peptide storage and stability guidance.
Commercial Terms
Price, availability, VAT treatment, dispatch cut-offs, courier selection, cold-pack policy, territory terms and returns for the Veyvora Summer Stack are set by the merchant’s live United Kingdom listing. The stated 12% bundle saving is confirmed on the Veyvora category page; confirm the resulting GBP price directly on the Veyvora research peptides catalogue before purchasing.
Veyvora states that research-peptide orders are dispatched within 24 hours under documented cold-chain conditions in an insulated bag with a gel ice pack (Veyvora, 2026); confirm the cold-pack and dispatch terms applicable to a specific order against the current en-GB checkout policy at the time of purchase. Related aesthetics and metabolic formats can be compared across the Veyvora research peptides catalogue for side-by-side assessment.
Research Use
The Summer Stack’s Melanotan II 20 and Retatrutide 20 pens are supplied for in-vitro laboratory research, such as melanocortin-receptor and incretin-receptor signalling assays in cell culture and use as analytical reference materials. Not for human or veterinary use.
For how an HPLC purity figure is measured and reported for a given protocol, consult Veyvora’s guide on how HPLC purity should be interpreted, then verify a batch against its CoA using the lot number on the pen before committing to an in-vitro study design.
Ready to proceed? View the Summer Stack on the Veyvora en-GB catalogue to confirm current price, availability and batch documentation before ordering.
Sources
[1] ICH Official web site : ICH, ich.org, https://www.ich.org/page/quality-guidelines
