Gansulin Pen: Stop Wasting Vials on Bad Diluent

TL;DR

The reusable Gansulin metal pen holds a standard 3 mL glass cartridge for precise measurement of reconstituted peptide research solutions at the lab bench.

Facts Index

FAQ

Which cartridges fit the Gansulin pen?

Standard 3 mL glass cartridges. Our pens take standard 3 ml (300-unit) glass cartridges with the 11 mm long plunger (stopper), the cartridge we sell. 3 ml cartridges are also made with a shorter, about 8 mm plunger, and a pen is built for one height, so check that a cartridge from another source has the 11 mm long plunger before loading it; the glass looks identical from the outside. Check stopper height, not just the 3 mL label, before you buy.

Do Gansulin cartridges work in other manufacturers' pens?

We haven't tested or verified this, including for specific third-party models such as the NEST Scientific 80U reusable pen (K240774). We can only confirm fit within the Gansulin pen system itself - check the stopper-height spec on your own hardware before assuming compatibility across brands.

Does benzyl alcohol affect peptide stability in solution?

Benzyl alcohol is the antimicrobial preservative in bacteriostatic water, added specifically to slow bacterial growth after a vial is opened - it is a disclosed, active ingredient of that diluent, not an inert filler. It does not rescue a solution that was already contaminated or degraded before reconstitution.

How do I calculate concentration for the pen?

Dissolve the peptide powder in bacteriostatic water (e.g., 5 mg in 2 mL = 2.5 mg/mL). Fill the cartridge with this solution; the pen's scale measures its volume.

Should I store the filled pen cartridge in the fridge?

Yes, for short-term stability. Store reconstituted peptide solutions in the refrigerator at about 4°C to slow degradation. Freezing may require careful thawing.