Description
Peptide Pen Injector — Reusable 3ml Cartridge Pen (V3)
A precision reusable injection pen engineered for researchers working with reconstituted peptide solutions. Constructed from anodised aluminium with an aircraft-grade body, this pen accepts standard 3ml borosilicate glass cartridges and delivers controlled, repeatable volumes with dial-in precision — making it a preferred delivery device for laboratory peptide research protocols.
Compatible with the Optimised Lifestyle 3ml Sterile Glass Cartridges and standard insulin-gauge pen needles (31G recommended). Designed for use with aqueous reconstituted solutions prepared with sterile diluent.
⚙️ Technical Specifications
| Type | Reusable injection pen (V3) |
| Cartridge compatibility | Standard 3ml borosilicate glass cartridges |
| Body material | Anodised aluminium (aircraft-grade) |
| Dosing mechanism | Dial-in plunger with click increments |
| Dose increment | 1 unit per click |
| Needle compatibility | Standard pen needles (31G × 4mm–8mm recommended) |
| Dimensions | ~148mm × 12mm |
| Weight | ~28g (without cartridge) |
| Colour | Gunmetal / dark anodised |
| Included | Pen body, cap, instructions. Cartridge and needles sold separately. |
| Use | Laboratory research use only |
🔬 Why Researchers Use This Pen
- Precision dosing — Dial-in mechanism eliminates the volume estimation errors common with conventional insulin syringes, critical when working with small volumes of concentrated peptide solutions
- Repeatability — Consistent click-mechanism delivery reduces inter-injection variability in longitudinal research protocols
- Cartridge system — 3ml cartridges hold significantly more reconstituted solution than standard vials, reducing reconstitution frequency in extended research protocols
- Cost efficiency — Reusable aluminium body; only cartridges and pen needles require replacement
- Sterile handling — Sealed cartridge system minimises contamination risk compared to multi-draw vials with conventional syringes
🧪 Setting Up Your Research Protocol
Step 1 — Reconstitution
Reconstitute your lyophilised peptide in sterile diluent to your target concentration. Common research concentrations range from 2–10mg/ml depending on the compound and protocol.
Step 2 — Loading the cartridge
Draw the reconstituted solution into a 3ml borosilicate glass cartridge using a standard syringe. Insert the cartridge into the pen body.
Step 3 — Needle attachment
Attach a sterile 31G × 6mm pen needle (recommended for subcutaneous research applications). Perform a 1–2 unit air prime before first use.
Step 4 — Dose dialling
Dial the required dose using the click mechanism. Each unit corresponds to a fixed volume based on your cartridge concentration.
Full reconstitution volume and concentration calculation guidance is available in our Peptide Reconstitution Guide.
❓ Frequently Asked Questions
What cartridges are compatible?
Standard 3ml borosilicate glass cartridges with a 29mm × 12mm rubber stopper. Optimised Lifestyle supplies compatible cartridges in packs of 5.
What needle gauge is recommended?
31G × 4mm or 31G × 6mm pen needles are standard for subcutaneous laboratory research applications. Available in our pack of 10.
Do I need sterile diluent?
Sterile diluent is the standard reconstitution solvent for most research peptides — it maintains sterility over multiple draws. See our reconstitution guide for step-by-step preparation.
Is this pen reusable?
Yes. The aluminium pen body is designed for extended reuse. Cartridges and pen needles are single-use and should be replaced between each cartridge/session.
What is the difference between this pen and the kit?
The Peptide Pen Kit includes the pen, cartridges, sterile diluent and needles — providing everything needed to begin a research protocol in a single purchase. This listing is the pen body only.
🔗 Complete Your Research Setup
- 3ml Sterile Glass Cartridges (Pack of 5) — Compatible cartridges for this pen
- Peptide Pen Needles 31G × 6mm (Pack of 10) — Sterile single-use needles
- Peptide Pen Kit — Pen + cartridge + sterile diluent + needles bundle
- Peptide Cooler Bag — Insulated travel case with reusable gel strip, holds two pens
- 4-Vial Storage Case — Fitted foam slots for four vials
Prefer everything in one box?
The Peptide Pen Kit bundles this same reusable injector with a sterile 3 ml glass cartridge and ten 31G × 6 mm needles — everything needed to get started, and less than buying the three parts separately.
⚠️ For laboratory research use only. This device is intended for use in controlled research environments by qualified personnel. Not for personal or clinical use. Optimised Lifestyle products are supplied in compliance with UK regulations governing research equipment.

















Deborah Lawson –
Excellent pen, excellent service. The build quality is noticeably better than other options I’ve tried. The grip is ergonomic, the cartridge change is easy and the dose dial is firm and accurate. Arrived promptly from Optimised Lifestyle with tracking. Really pleased — this is now my default supplier.
Paul Davenport –
Very happy with this purchase. The pen is well made and the dose settings are clear and accurate. I was a bit cautious ordering from a new supplier but Optimised Lifestyle have been completely professional — responsive, fast dispatch and the product is exactly what was described. Will definitely be a regular customer.
Natalie Brewster –
Brilliant product from a brilliant company. The pen injector is exactly as described — high quality, precise and durable. The reusable design is far more practical than disposables. Optimised Lifestyle dispatched the same day and it arrived the next morning. Discrete packaging, professional presentation. Cannot fault it.
Robert Kipling –
Second order from Optimised Lifestyle and once again really happy. The pen is sturdy, well balanced and the mechanism feels built to last. Easy to prime and comfortable to use. Delivery was tracked and arrived exactly when expected. These guys are reliable and the product quality matches the price.
Katie Morrison –
Good quality pen and a smooth experience with Optimised Lifestyle from start to finish. Arrived well packaged and quickly. The injector itself is comfortable to hold and the dose dialling is precise. Would give 5 stars but the needle disposal guidance could be clearer in the packaging. Minor point — the product is excellent.
Ian Griffiths –
Solid bit of kit. The pen is well engineered — no rattling parts, the cartridge locks in firmly and the dose control is accurate. Had a quick question before ordering and Optimised Lifestyle replied same day. Delivery was quick too. Exactly what I needed and would recommend without hesitation.
Louise Pemberton –
Really impressed with the quality of this pen. It feels premium in the hand and the mechanism is smooth and reliable. Much better than a cheaper one I bought elsewhere. Delivery from Optimised Lifestyle was fast — same day dispatch and arrived the next day. Great service all round.
Andrew Sutton –
Absolutely spot on. The pen is beautifully made — solid, precise and easy to use. The dose dial clicks cleanly into each increment with no slipping. Ordered Tuesday, arrived Thursday via Royal Mail Tracked. Packaging was discreet which I appreciated. Optimised Lifestyle are clearly a professional outfit and I’ll be coming back for cartridges.