Retatrutide Auto-Injection Pen

Buy Retatrutide Auto-Injection Pen

The Retatrutide Auto-Injection Pen is the newest format in our GLP-1 research peptide lineup: a prefilled retatrutide pen (LY3437943), ready to use straight out of the box. No powder, no mixing, no syringes to fill — it’s the simplest, most hassle-free format we sell, and it’s made to order.

❄️ Made to order & cold-shipped Monday–Thursday only. Every pen and cartridge is made to order and shipped as quickly as we can. To keep it cold and fresh, pens and cartridges ship Monday through Thursday so they never sit in a carrier warehouse over the weekend. Orders placed after 4:00 PM ET Thursday ship the following Monday.

Why Choose the Auto-Injection Pen

• Ready out of the box. Prefilled — no reconstitution, no bacteriostatic water, no vial transfer.
• Complete injector. A standalone pen — nothing else to buy.
• Fast. Made to order. Ships 2-Day with tracking — at your door 2 business days after it ships.

What You Get

Pen vs. Vial vs. Cartridge

Shipping

Every pen ships 2-Day with tracking. Ships Monday–Thursday only, as soon as it’s made. Need it even sooner? Choose Next Day at checkout. Canada orders ship Express.

Retatrutide Pen for Sale — Prefilled Injection Pen

Looking to buy a retatrutide pen online? This retatrutide injection pen comes prefilled in your choice of size, so there is no powder to reconstitute, no bacteriostatic water and no vial-to-syringe transfer. It is a complete, standalone retatrutide pen injector — add it to your cart, check out.

Retatrutide Pen Price

The retatrutide pen price is listed per pen at the top of this page — pick your size and the price updates.

Where to Buy a Retatrutide Pen Online

• U.S. store, U.S. shipping. Every order ships to U.S. and Canadian addresses with tracking, Monday through Thursday.
• Fast. Every pen ships 2-Day with tracking — Next Day available at checkout.
• COAs on request. Ask for the certificate of analysis for this product and we will send it.
• Earn rewards. Registered customers earn loyalty points on every order.

About Retatrutide

Retatrutide (LY3437943) is a triple agonist of the GIP, GLP-1 and glucagon receptors. Retatrutide is an investigational compound developed by Eli Lilly and is not FDA-approved. Prefer a different format? Shop retatrutide vials, retatrutide pen cartridges for the V3 pen, or the Tirzepatide Auto-Injection Pen. See every option in GLP-1 research peptides.

Frequently Asked Questions

When will my Retatrutide pen ship?

Fast. Pens are made to order and every pen ships 2-Day with tracking. Ships Monday–Thursday only, as soon as it’s made. Canada orders ship Express.

How easy is the retatrutide pen to use?

Very. It comes prefilled, so there is nothing to mix, draw up or measure. Set the dial, click, and you’re done — and it’s small enough to take anywhere.

Is the pen prefilled?

Yes. The pen arrives prefilled with the total content shown for the size you choose. There is no reconstitution step.

Do I need the V3 pen?

No. The V3 pen is for our pen cartridges. This auto-injection pen is a complete, standalone unit.

How much does a retatrutide pen cost?

Prices for every size are shown at the top of this page — choose the size you want and the price updates.

Where can I buy a retatrutide pen?

Right here. MyGLP1Store sells the retatrutide injection pen online in multiple sizes and ships to U.S. and Canadian addresses with tracking.

Is this pen made by Eli Lilly?

No. Retatrutide is still in clinical trials and there is no Lilly-branded retatrutide pen on the market. This pen is sold by MyGLP1Store and is not made, sold or endorsed by Eli Lilly.