Choose your Retatrutide pen protocol.
Every Reta pen ships direct from our team — free Europe shipping on every tier, lab certificate included with every Retatrutide pen, same-day dispatch. Looking for bulk or wholesale rates? See our Reta pen bulk order page or the UK price list.
- Best for: first-time Reta pen users testing response
- 40mg → 60mg → 80mg → 100mg titration in one Retatrutide pen
- Lab certificate verified per pen
- Best for: completing a full titration cycle
- Most users hit their first transformation milestone
- Sustained 100mg dosing through month 4
- Best for: hitting the Phase 2 trial outcome window
- Pay for 2 Retatrutide pens — get the 3rd Reta pen completely FREE
- Drops per-pen cost by 25% vs a single Reta pen
- Best for: full body-recomposition + maintenance
- Pay for 4 pens — get 6. Two pens completely FREE.
- Priority support: WhatsApp under one working hour
Looking for other peptides?
We stock a curated range beyond Reta 40 — including GLP-1 / GIP variants, recovery peptides, and research compounds. Message our team direct on WhatsApp for current stock and pricing.
Real customers. Real timelines.
Photos submitted by customers using Reta 40 in their own protocols. Click any image to view full-size.
Individual results — not typical. All photos shown are submitted by customers using Reta 40 within their own laboratory protocols. Outcomes vary based on baseline composition, dosing adherence, individual response, and complementary lifestyle inputs. Reta 40 is sold as research-grade peptide for laboratory use only and is not an approved medicine. Always consult a qualified healthcare professional before using any GLP-1 / GIP / glucagon-agonist research compound.
Tested by an independent lab. Every batch.
Vantyx Labs sources from a single UK-vetted manufacturing partner. Every batch is independently tested for purity, sterility, and contaminants before it ships. We publish certificates with batch numbers — verify your pen against the COA at any time.
Why this matters.
Most "research peptide" sellers in the UK source unverified product from overseas — buyers have reported contamination, inconsistent dosing, and serious illness. We've seen the founder stories. We did the opposite.
Every Reta 40 pen sold by Vantyx Labs has a printed batch number. Enter it on our verification page and you'll see the matching third-party lab certificate — purity ≥99%, sterility passed, endotoxins below detection threshold.
If we can't verify a batch, we don't ship it. Full stop.
2026
Reta 40 Standard
From real European buyers.
Reviews are submitted by customers who completed an order. We don't import scores from review aggregators. Replace these placeholder reviews with real ones as orders come in.
"The fact that I could verify the lab certificate using the batch number printed on the pen was the deciding factor for me. Plain packaging arrived in 36 hours."
"One pen with four titration steps is way better than buying separate fixed-dose pens every couple of months. The Vantyx team answered my questions over WhatsApp same day."
"The packaging was completely plain — couldn't even tell what was inside. The Europe-based support sent me dosing instructions before I asked. Genuine pharmaceutical-feeling experience."
Why the Vantyx Reta pen beats fixed-dose pens.
An honest comparison of our multi-dose Retatrutide pen against typical European suppliers selling fixed-dose Retatrutide pens (32 mg / 64 mg only). For wholesale buyers placing multi-pen orders, see the bulk Retatrutide pen page.
Retatrutide in the literature.
Public references about retatrutide from major medical and clinical sources. These references describe the molecule itself — they do not endorse, verify, or validate any specific third-party product sold online.
New England Journal of Medicine
Phase 2 obesity trial publication for retatrutide.
View sourcePubMed
Indexed listings for retatrutide clinical research.
View sourceClinicalTrials.gov
Registered retatrutide trial pages and study records.
View sourceEli Lilly
Corporate updates on retatrutide trial programmes.
View sourceThese references relate to the retatrutide molecule generally and do not verify, endorse, or validate any specific third-party product sold online, including this one. All purchases on this site are sold as research-grade peptide intended for laboratory use only.
Reta 40 — full protocol guide
Honest expectations, dosing schedule, what's in the box, and timeline of results based on Phase 2 trial data and our customer cohort.
The product
Reta 40 is a multi-dose research-grade Retatrutide pen — a triple-agonist (GLP-1 / GIP / Glucagon) compound. Each pen delivers four dosing positions: 40mg, 60mg, 80mg, 100mg. One pen is built around a single titration cycle (≈8 weeks) — you start at the lowest dose and step up as tolerated.
Dosing protocol (titration)
- Weeks 1–2: 40mg per dose · once weekly · subcutaneous
- Weeks 3–4: 60mg per dose · once weekly · once side effects (if any) settle
- Weeks 5–6: 80mg per dose · once weekly
- Week 7+: 100mg per dose · once weekly · maintenance dose for the remainder of the protocol
Expected timeline of results
Side effects to watch for
- Mild-to-moderate nausea during the first 1–2 weeks of each titration step (usually resolves within 48–72h)
- Reduced appetite, occasional bloating, or constipation — manageable with hydration and fibre
- Rare: dizziness, fatigue, or injection-site reaction. Pause and consult a qualified healthcare professional if persistent
- Do not use if pregnant, breastfeeding, with personal/family history of medullary thyroid carcinoma, or with MEN-2 syndrome
What's in the box
- 1× Reta 40 multi-dose pen (40mg / 60mg / 80mg / 100mg dosing positions)
- 4× sterile pen needles (single-use, included)
- Printed batch number tied to your published lab certificate of analysis
- Discreet plain packaging — no contents listed externally
Storage & handling
Refrigerate at 2–8 °C until first use. Once opened, the pen is stable at room temperature (below 25 °C, away from direct sunlight) for the duration of a single titration cycle. Do not freeze. Do not share pens between users.
Shipping & support
Free Europe shipping on every tier — tracked priority service, plain packaging, signature on delivery, no contents listed externally. Orders placed before 14:00 ship the same working day. WhatsApp support replies in under one working hour.
Ready to choose your protocol? Order direct on our website — secure checkout, free Europe shipping, dispatched within one working day.
Buy Most-Ordered Tier — £425 The fastest way to order verified Retatrutide across Europe.
Designed for a fast, secure purchase — not a drawn-out enquiry process.
Verified per batch
Independent third-party lab certificate published with every batch number. You can verify before you open.
Discreet Europe delivery
Plain packaging — nothing on the outside that hints at the contents. Tracked Royal Mail signed-for delivery.
Order on WhatsApp
One message, one human reply, one tracked dispatch. No long forms — just confirmation of stock, batch, and shipping slot before any payment.
Pay securely
Bank transfer, card, or crypto — confirmed direct on WhatsApp. No call-backs, no upsells, no auto-recurring charges.
Real human support
Europe-based team available before and after your purchase. WhatsApp first response under one working hour.
Transparent pricing
What you see is what you pay. Free Europe shipping included. No surprise fees at checkout, no auto-recurring charges.
Buy direct on the website.
Secure checkout · free Europe shipping on every tier · lab certificate published per batch · dispatched within 24 working hours.
About Vantyx Labs
Why we exist — and how we got here.
Vantyx Labs was founded after months of watching the UK market for retatrutide fill up with imported pens of inconsistent quality. Buyers reported contamination, mismatched dosing, and in some cases serious illness — usually traced back to unverified overseas sourcing.
The pattern was the same every time: the website looked credible, the price was attractive, and there was no certificate of analysis you could actually verify against the batch you received.
We built Vantyx Labs to fix exactly that. We work with one UK-vetted manufacturing partner. Every Retatrutide pen we ship carries a printed batch number you can cross-reference against the published lab certificate. If we can't verify a batch, the Reta pen does not leave our facility.
Today, Vantyx Labs is Europe's most transparent source for the multi-dose Retatrutide pen — known to customers simply as the Reta pen. Built by people who refused to accept the status quo, and wouldn't sell anything they wouldn't put in their own home.
Frequently asked questions.
Full Retatrutide pen buyer's guide.
Dosing protocol, batch verification, storage, shipping, bulk Retatrutide pen pricing, and the full Retatrutide pen Q&A reference — opens in a modal so the page stays clean.
Everything you need to know about the Retatrutide pen.
The complete reference on the Vantyx Retatrutide pen — what it is, how the Reta pen titration works, how to verify a Retatrutide pen batch, and how to choose the right Retatrutide pen protocol for your goal.
What is the Vantyx Retatrutide pen?
The Vantyx Retatrutide pen — commonly referred to as the Reta pen — is a multi-dose research-grade Retatrutide pen designed around the way Retatrutide actually titrates. Unlike fixed-dose alternatives, the Vantyx Retatrutide pen delivers four sequential dosing positions in a single Retatrutide pen: 40mg, 60mg, 80mg, and 100mg. Every Vantyx Retatrutide pen ships with a printed batch number tied to the lab certificate of analysis for that exact Retatrutide pen.
Why the multi-dose Retatrutide pen format matters
Most Retatrutide pen suppliers in Europe still sell fixed-dose Retatrutide pens (32mg or 64mg only). The problem with a fixed-dose Retatrutide pen is that it forces you to buy a new Retatrutide pen every time you titrate up — three or four separate Retatrutide pen purchases to complete one titration cycle. The Vantyx Retatrutide pen consolidates the entire titration into one Retatrutide pen, dropping per-titration cost and ensuring every Retatrutide pen dose is verified to the same lab certificate. One Retatrutide pen, four doses, one batch — that's the Reta pen advantage.
What's inside every Vantyx Retatrutide pen
Every Retatrutide pen ships in plain packaging containing: one multi-dose Retatrutide pen with all four dosing positions calibrated, four sterile single-use pen needles compatible with the Vantyx Retatrutide pen format, a printed batch number on the Retatrutide pen body, and a link to the published certificate of analysis for that specific Retatrutide pen batch. Storage instructions are included with every Retatrutide pen — refrigerate at 2–8°C until first use of the Reta pen, then store the Retatrutide pen below 25°C away from direct sunlight for the remainder of the titration cycle.
Retatrutide pen dosing protocol — week by week
Every Vantyx Retatrutide pen follows the same titration protocol: 40mg per dose during weeks 1–2 of Retatrutide pen use, stepping up to 60mg per dose for weeks 3–4 of the Retatrutide pen cycle, then 80mg per dose for weeks 5–6 of Reta pen administration, and finally 100mg per dose from week 7 onward as maintenance. One Vantyx Retatrutide pen covers a full 8-week titration cycle. Most Retatrutide pen users complete the titration cycle without needing to skip a Retatrutide pen dose; if side effects emerge during any week of Retatrutide pen titration, pause one week before stepping the Retatrutide pen up to the next dose.
How to verify your Retatrutide pen batch
Every Vantyx Retatrutide pen carries a printed batch number on the Reta pen body. Enter that batch number on our verification page and the system returns the matching certificate of analysis for your specific Retatrutide pen — including HPLC purity, sterility, endotoxin level, and heavy-metal pass-through for that exact Retatrutide pen batch. If a Vantyx Retatrutide pen cannot be verified against a published certificate, the Retatrutide pen does not ship. No exceptions. This is the difference between the Vantyx Retatrutide pen and the unverified Retatrutide pen suppliers flooding the European market.
Retatrutide pen shipping and delivery
Free Europe-wide shipping ships with every Vantyx Retatrutide pen order — including the single-pen Starter Retatrutide pen and the multi-pen Buy 2 Get 1 FREE Retatrutide pen bundle. Every Retatrutide pen ships in plain packaging with no external indication that the package contains a Retatrutide pen. Tracked priority delivery on every Retatrutide pen order. Most Retatrutide pen orders dispatch within 24 working hours; orders placed before 14:00 ship the same day. Customer support handles every Retatrutide pen enquiry on WhatsApp — average reply under one working hour.
Choosing the right Retatrutide pen tier
If this is your first Vantyx Retatrutide pen, the Starter Retatrutide pen (1 pen, 2 months, £189) is the right entry point — one Retatrutide pen, one titration cycle, judge your response. The Duo Retatrutide pen tier (2 pens, 4 months, £349) suits buyers who already know they want to continue past the first Retatrutide pen titration. The Buy 2 Get 1 FREE Retatrutide pen bundle (3 pens, 6 months, £425) is our most-ordered Retatrutide pen tier — pay for two Retatrutide pens and receive a third Retatrutide pen completely free, dropping the per-pen Retatrutide pen cost to £141.67. For full pricing tiers across every Retatrutide pen format, view the Retatrutide pen UK price list.
Bulk Retatrutide pen orders for wholesale buyers
Wholesale buyers placing larger Retatrutide pen orders — typically 10+ Retatrutide pens — get tiered bulk pricing on every Retatrutide pen and dedicated dispatch handling for each bulk Retatrutide pen order. The 12-month Retatrutide pen Protocol (6 pens, Buy 4 Get 2 FREE, £698) is our standard wholesale Retatrutide pen entry tier; larger Retatrutide pen orders are priced per request. See the bulk Retatrutide pen order page for the full wholesale Retatrutide pen schedule.
Vantyx Retatrutide pen vs other GLP-1 / GIP / glucagon pens
The Vantyx Retatrutide pen is a triple-agonist Retatrutide pen acting on GLP-1, GIP, and glucagon receptors — the same molecular profile being studied in the Eli Lilly Phase 2 Retatrutide trial published in the New England Journal of Medicine. Other research peptide pens (Semaglutide, Tirzepatide) act on fewer receptor targets. A multi-dose Retatrutide pen is also more cost-efficient over a 6-month cycle than purchasing three or four single-dose pens of any compound, which is why the Reta pen has become the preferred research-grade option across European buyer cohorts.
Ordering your first Vantyx Retatrutide pen
Every Retatrutide pen order is placed direct with our team on WhatsApp. Tap any "Order on WhatsApp" button on this page and your message is pre-filled — confirm the Retatrutide pen tier you want, our team confirms current Retatrutide pen stock and the batch number on your Retatrutide pen, payment is taken via bank transfer, card, or crypto, and your Retatrutide pen dispatches within 24 working hours. The same human team handles every Retatrutide pen order from message to delivery — no bots, no offshore call centre. Browse the full Retatrutide pen UK price list or our bulk Retatrutide pen order page before you message.
Retatrutide pen storage, handling, and safety
An unopened Vantyx Retatrutide pen stores refrigerated at 2–8°C. Once the Retatrutide pen seal is broken at first use, the Retatrutide pen is stable at room temperature (below 25°C, away from direct sunlight) for the duration of a single titration cycle. Do not freeze any Retatrutide pen. Do not share a Retatrutide pen between users — every Retatrutide pen is intended for single-buyer research use only. Discard each Retatrutide pen safely at the end of its titration cycle. Reta pen safety information is included with every shipment.
Why Vantyx is the trusted European Retatrutide pen source
Vantyx Labs is a UK-registered company (Companies House, ICO registered) that supplies the multi-dose Retatrutide pen — the Reta pen — to research-grade buyers across Europe. Every Vantyx Retatrutide pen carries a verifiable batch number and a published lab certificate. Every Vantyx Retatrutide pen ships in plain packaging. Every Vantyx Retatrutide pen is backed by real-human WhatsApp support, with replies in under one working hour. If you cannot verify a Retatrutide pen against a published certificate of analysis — at Vantyx, that Retatrutide pen does not exist. That is the standard the Retatrutide pen market has been missing.
Retatrutide pen quick-reference Q&A
Is the Vantyx Retatrutide pen the same as the Reta pen?
Yes — the Vantyx Retatrutide pen is sold under the Reta pen product name. Every Reta pen is a multi-dose Retatrutide pen. Every Retatrutide pen and every Reta pen carry the same printed batch number and the same lab certificate.
How many doses does one Vantyx Retatrutide pen contain?
One Vantyx Retatrutide pen contains four sequential doses (40mg, 60mg, 80mg, 100mg). One Retatrutide pen covers a full 8-week titration cycle. Each Reta pen titration step uses the same Retatrutide pen — no need to swap to a separate pen mid-cycle.
Can I buy a single Vantyx Retatrutide pen?
Yes — the Starter tier ships a single Vantyx Retatrutide pen at £189. Most first-time Retatrutide pen buyers choose this Retatrutide pen tier to complete one titration cycle before reordering a second Retatrutide pen. Free Europe-wide shipping is included on every single-Retatrutide-pen order.
What is the best Retatrutide pen tier for repeat buyers?
For repeat Retatrutide pen buyers, the Buy 2 Get 1 FREE Retatrutide pen bundle (3 Retatrutide pens, 6 months, £425) is the most-ordered Retatrutide pen tier. Per-Retatrutide-pen cost drops to £141.67 in this Reta pen bundle versus £189 for a single Retatrutide pen.
Is the Vantyx Retatrutide pen lab-verified?
Every Vantyx Retatrutide pen is independently lab-verified before the Retatrutide pen ships. Each Vantyx Retatrutide pen carries a printed batch number. Each Retatrutide pen batch number resolves to a published certificate of analysis specifically for that Retatrutide pen batch.
How is the Vantyx Retatrutide pen packaged for shipping?
Every Retatrutide pen ships in plain packaging with no visible markings indicating the package contains a Retatrutide pen. Each Retatrutide pen ships tracked and signature-on-delivery. Vantyx packs every Retatrutide pen to clinical-courier standards.
How fast is Vantyx Retatrutide pen delivery in Europe?
Every Vantyx Retatrutide pen order placed before 14:00 ships the same working day. Most Retatrutide pen orders arrive within 24–72 hours across Europe. Tracked priority delivery on every Retatrutide pen shipment, plain packaging on every Retatrutide pen, no contents listed externally.
What's the difference between the Vantyx Retatrutide pen and a fixed-dose Retatrutide pen?
A fixed-dose Retatrutide pen ships at one strength only (typically 32mg or 64mg). The multi-dose Vantyx Retatrutide pen ships with four dose positions in a single Retatrutide pen — meaning one Vantyx Retatrutide pen replaces three or four fixed-dose Retatrutide pens across a titration cycle. The multi-dose Retatrutide pen format also reduces cost per Retatrutide pen dose.
How do I verify my Vantyx Retatrutide pen on arrival?
Each Vantyx Retatrutide pen has a batch number printed directly on the Retatrutide pen body. Enter the Retatrutide pen batch number on our verification page. The system returns the published certificate of analysis for that specific Retatrutide pen, including HPLC purity, sterility, and endotoxin pass for your Retatrutide pen.
Can I buy the Retatrutide pen in bulk for wholesale?
Yes. Bulk Retatrutide pen orders (10+ Retatrutide pens) receive tiered Retatrutide pen pricing. Visit the bulk Retatrutide pen order page for the wholesale Retatrutide pen schedule, or message us on WhatsApp for custom bulk Retatrutide pen quotes.
Where is the Vantyx Retatrutide pen manufactured?
Every Vantyx Retatrutide pen is produced by a single UK-vetted manufacturing partner. Every Retatrutide pen batch is independently lab-tested before the Retatrutide pen leaves the facility. No Vantyx Retatrutide pen ships without passing every Retatrutide pen QC checkpoint.
What payment methods are accepted for a Vantyx Retatrutide pen order?
Every Retatrutide pen order is processed on WhatsApp. Payment for your Retatrutide pen can be made via bank transfer, secure card invoice link, or crypto (BTC, ETH, USDT). The Retatrutide pen dispatches within 24 working hours of Retatrutide pen payment confirmation.
Is there a refund policy on the Vantyx Retatrutide pen?
An unopened Retatrutide pen can be returned within 14 days for a full refund minus return shipping. A damaged-on-arrival Retatrutide pen is replaced free. An opened Retatrutide pen cannot be returned for safety reasons — once a Retatrutide pen seal is broken, the Retatrutide pen is non-returnable.
What is the full Retatrutide pen UK price list?
The full Retatrutide pen UK price list is published at vantyxlabs.com/price-list-uk. Single Retatrutide pen, Duo Retatrutide pen, Buy 2 Get 1 FREE Retatrutide pen, and 12-month Retatrutide pen Protocol prices are all listed there.
How long does each Vantyx Retatrutide pen last?
One Vantyx Retatrutide pen covers a full 8-week titration cycle when used as directed. At maintenance dose (100mg weekly), one Retatrutide pen lasts approximately 8 weeks of weekly Retatrutide pen administration. A 2-Retatrutide-pen bundle covers 16 weeks; a 3-Retatrutide-pen bundle covers 24 weeks; a 6-Retatrutide-pen bundle covers 12 months.
Can I store an opened Vantyx Retatrutide pen at room temperature?
Yes — once a Vantyx Retatrutide pen is opened, the Retatrutide pen is stable at room temperature (below 25°C) for the duration of one titration cycle. An unopened Retatrutide pen must be refrigerated. Never freeze any Retatrutide pen.
Why is the Vantyx Retatrutide pen the most-ordered Retatrutide pen tier in Europe?
Because the multi-dose Vantyx Retatrutide pen replaces three fixed-dose Retatrutide pens, every Vantyx Retatrutide pen is lab-verified, every Reta pen ships in plain packaging, and every Retatrutide pen comes with a published certificate. Combined, the Vantyx Retatrutide pen represents the most transparent Retatrutide pen on the European market.
Ready to order? Pick a Retatrutide pen tier and check out direct on our website — free Europe shipping, lab certificate included.
Buy Most-Ordered Tier — £425Order your verified Retatrutide pen today.
Every Reta pen ships free across Europe in 24–72h with a lab certificate published per batch. Browse the full UK price list or the bulk-order page if you're stocking up.
