Injector Pens

Reusable peptide pens built for accurate, repeatable research dispensing. Every injector pen here takes the standard 3ml glass cartridge, dials up in precise units, and can be refilled again and again — a reusable pen typically pays for itself within its first few cartridges compared with disposables.
Choose the proven V3 pen, the newer V5 pen with its 80-unit dial and retracting needle, or a complete peptide pen kit with cartridges and needles included. Not sure which generation fits your work? Our pen versions guide compares V1 through V5, and the step-by-step how-to guide covers filling, priming and dialling. Prefer single-use? Disposable pens come in packs of five, sealed and ready to go. All pens are for research use, dispatched same working day by Royal Mail.