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RefillPen
V2 Peptide Pen — Ruby Red

V2 Peptide Pen

5.0· 66 verified reviews
$24.99
  • Open cap — needle hidden
  • Our everyday pen
  • Easy to load and dial
Supplier
Color: Ruby Red
  • Most orders ship same day
  • Free shipping over $59
  • Ready to use on arrival
  • 7-day guarantee

Every pen comes with a 3 mL cartridge. Starter tools are included once per order.

The V2 is our simple, painless everyday peptide pen — a reusable injection pen with an open-cap design that's easy to use, load, and dial accurately. Choose the Original V2 or our New Supplier run with even more colors; both use a standard 3 mL cartridge and universal pen needles.

A reusable everyday peptide pen

The V2 is the pen most people start with — a straightforward, comfortable open-cap design that loads a standard 3 mL cartridge and dials cleanly. RefillPen is reusable hardware built to be used again and again. When a cartridge runs out you swap the inexpensive 3 mL cartridge, not the pen — that's the whole idea behind a refillable peptide pen.

Accuracy you can trust

Accuracy is what the peptide community asks about most, and it's what our reviews single out. The dial advances one click at a time, and on the pen's 100-unit scale one click equals one unit (0.01 mL) — so the number you set is the number you draw.

Everything you need to start

Every RefillPen comes with one 3 mL cartridge, and every order includes a set of starter tools, so you can get started the day it arrives. Ordering several pens, for yourself or someone else? Each pen still gets its own cartridge, and you can add an extra starter tools set for $2 in your cart.

New Refill Button!
Where's My Plastic Cartridge Holder????

Common questions

How does a peptide pen work?

You load a standard 3 mL glass cartridge into the pen, attach a universal pen needle, and turn the dial to set your amount in units. On the 100-unit scale one click equals one unit (0.01 mL), so what you dial is what you draw. When the cartridge is empty you replace the cartridge, not the pen.

How long does a peptide pen last?

The pen is reusable hardware you keep and refill — you replace the low-cost 3 mL cartridge rather than the pen itself, so one pen stays in service across many cartridges.

What cartridges and needles fit?

Every RefillPen model uses the same consumables: standard 3 mL glass cartridges and universal pen needles. Individually sterilized 3 mL cartridges are about $1 each.

Is the needle visible when I inject?

The V2 uses an open-cap design that keeps the needle out of sight while you inject.

Not sure how many units to dial?

Use the free peptide dosing calculator on this site to find your exact units — enter your numbers and it returns the units (clicks) to set on the pen.

What's the difference between the V1, V2, V2.5, and V3?

All four are reusable peptide pens that share the same 3 mL cartridges and universal needles; they differ in cap style (open cap hides the needle, closed cap shows it), body and dial feel, and dose range. See the 'Best Reusable Peptide Pen' guide to compare them side by side.

Reviews

5.0from 66 verified buyers
Verified buyer
LOVE these pens!
I'm one of those multiple pin per day people and I gave up doing it a few months ago because I couldn't stand the constant filling of the syringes every single day. I saw this company on TikTok, ordered and had my pens within days. All I can say is that I would do 20 pins a day if this was all it took! I have 4 pens now and will never go back to the old school way :)
Nicole · Feb 17
Luv This Pen!
I have several of these pens and luv them. No more syringes. Easy to use and makes my morning injections simple. Thanks!
Diana · Aug 23, 2025
Verified buyer
Amazing Pens!!
I had previously purchased pens from another supplier and had tons of issues. I reached out to refill pens to get some advice and quickly made my first purchase. Let me tell you I do not regret the decision. This will be my go to spot for peptide pens going forward. I truly love the pens the design is awesome.The pens are strong, sturdy and made extremely well.
Diana · Sep 18, 2025
Verified buyer
Best pens ever!
Very durable and easy to use, super cute colors! 10/10, will always buy back here!
Mah C. · Feb 12
Verified buyer
Super V2 pen
Hele snelle levering en top producten
Fortunata Peluso · Aug 10
Verified buyer
Love The Pen
The package showed up and I was so excited. When I opened it up to see the display it got even better! The instructions on use are so easy to understand and follow. It’s simple, and makes it so convenient when you need multiple different injections to switch out the cartridges.
Amy · Oct 30, 2025

Complete your setup

Want the whole setup? Build a Starter Kit →
3ml Individually Packed Glass Cartridge For Pen

3ml Individually Packed Glass Cartridge For Pen

The $1 sterilized 3 mL glass refill that fits every RefillPen.

$1.00
Halo Cartridge Holder

Halo Cartridge Holder

A filling block that holds your cartridge steady for a clean, bubble-free fill.

Color: Black

$9.99
Number Labels

Number Labels

Slide-on numbers so every pen shows your units at a glance.

Color: Pink

$9.99
RefillPen Labels

RefillPen Labels

Slide-on labels so you can tell at a glance what's loaded in each pen.

From $0.99Choose labels