How-To Guides

The best reusable peptide pen is the one that’s still working right two years from now. A metal pen with a clean dial and a smooth plunger can last that long. Most pens that fail early weren’t defective. They got dropped, soaked or forced. Here’s how

A 3 mL glass cartridge is the cheapest part of your setup, and it’s also the part most likely to cause a bad day. The pen around it is solid metal and will last for years. The cartridge is glass and rubber, and it doesn’t forgive much. This guide cov

The FDA's two steps: put used needles in a sharps container right away, then dispose of the container by your local rules. Here's what counts as a container and where to take it.

Most reusable pen problems come down to five causes: a blocked needle, air, a plunger rod that needs resetting, a cartridge that isn't seated, or the cartridge running low.

Can't find the cartridge holder on your PepPen V2 or V3? It's there. Here's exactly where it is and how to get to it in five seconds.

The simple vent needle method for filling a 3 mL peptide pen cartridge, plus how to clear the air before first use. No special equipment needed.