What is dead volume in a peptide pen?

Dead volume is the liquid left trapped in the cartridge tip and needle hub after dispensing, which can be a significant percentage of your total reconstituted sample in poorly designed pens.

Why use glass cartridges instead of plastic?

Neither glass nor plastic is perfectly inert: glass flakes due to chemical delamination have been observed in parenteral liquid formulations after long-term storage (Jiang et al. 2013), the unpredictable nature of peptide binding to surfaces requires optimization of experimental containers (Goebel-Stengel et al. 2011), and cetrorelix adsorbed more to glass than to polypropylene (Grohganz et al. 2004).

Can I store reconstituted peptide in the pen?

It is not recommended. Store your reconstituted peptide solution in a sealed vial under proper conditions. Fill the pen's cartridge directly from this vial just before your bench work.

PreppinPeppers › Facts › Lab article

Why your peptide pen is silently wasting your vials

Machine-readable facts for this Lab article. The full page is https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials.

TL;DR

A reusable metal peptide pen houses a standard 3 ml glass cartridge and delivers fixed, dial-measured increments. Here's how it can still waste your vials.

Facts Index

Fact ID	Category	Entity	Attribute	Value	Source
why-your-peptide-pen-is-silently-wasting-your-vials:title	identity	Why your peptide pen is silently wasting your vials	title	Why your peptide pen is silently wasting your vials	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials) (evidence)
why-your-peptide-pen-is-silently-wasting-your-vials:published	identity	Why your peptide pen is silently wasting your vials	published	2026-08-15	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials) (evidence)
why-your-peptide-pen-is-silently-wasting-your-vials:author	identity	Why your peptide pen is silently wasting your vials	author	Preppin' Peppers Editorial Team	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials) (evidence)
why-your-peptide-pen-is-silently-wasting-your-vials:topics	identity	Why your peptide pen is silently wasting your vials	topics	best peptide pen, peptide pen, reconstitution, research	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials) (evidence)
why-your-peptide-pen-is-silently-wasting-your-vials:summary	content	Why your peptide pen is silently wasting your vials	summary	A reusable metal peptide pen houses a standard 3 ml glass cartridge and delivers fixed, dial-measured increments. Here's how it can still waste your vials.	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials) (evidence)
why-your-peptide-pen-is-silently-wasting-your-vials:section-1	content	Why your peptide pen is silently wasting your vials	section	What It Is	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials) (evidence)
why-your-peptide-pen-is-silently-wasting-your-vials:section-2	content	Why your peptide pen is silently wasting your vials	section	Why Metal Beats Plastic for Your Bench	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials) (evidence)
why-your-peptide-pen-is-silently-wasting-your-vials:section-3	content	Why your peptide pen is silently wasting your vials	section	Cartridge Tolerances and the Dead Volume Problem	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials) (evidence)
why-your-peptide-pen-is-silently-wasting-your-vials:section-4	content	Why your peptide pen is silently wasting your vials	section	Common Bench Mistakes When Using a Peptide Pen	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials) (evidence)
why-your-peptide-pen-is-silently-wasting-your-vials:section-5	content	Why your peptide pen is silently wasting your vials	section	An Opinionated Take: What You're Really Buying	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials) (evidence)
why-your-peptide-pen-is-silently-wasting-your-vials:section-7	content	Why your peptide pen is silently wasting your vials	section	What the research community gets wrong about peptide reconstitution pens	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials) (evidence)
why-your-peptide-pen-is-silently-wasting-your-vials:source-pubmed-ncbi-nlm-nih-gov	source	Why your peptide pen is silently wasting your vials	cites	Jiang et al. 2013 - pubmed.ncbi.nlm.nih.gov	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials) (evidence)
why-your-peptide-pen-is-silently-wasting-your-vials:source-pmc-ncbi-nlm-nih-gov	source	Why your peptide pen is silently wasting your vials	cites	Goebel-Stengel et al. 2011 - pmc.ncbi.nlm.nih.gov	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials) (evidence)
why-your-peptide-pen-is-silently-wasting-your-vials:source-pubmed-ncbi-nlm-nih-gov-2	source	Why your peptide pen is silently wasting your vials	cites	Grohganz et al. 2004 - pubmed.ncbi.nlm.nih.gov	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials) (evidence)
why-your-peptide-pen-is-silently-wasting-your-vials:product-gansulin-metal-peptide-pen	products	Why your peptide pen is silently wasting your vials	references product	Gansulin Pen · Reusable Click-Dial, 3 ml (1-60 Units)	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials) (evidence)
why-your-peptide-pen-is-silently-wasting-your-vials:product-gansulin-3ml-cartridge	products	Why your peptide pen is silently wasting your vials	references product	Gansulin-Compatible 3 ml Glass Cartridge for Pens (10-Pack)	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials) (evidence)
why-your-peptide-pen-is-silently-wasting-your-vials:source-pubmed-ncbi-nlm-nih-gov-3	source	Why your peptide pen is silently wasting your vials	cites	Bohannon, Postgrad Med 1999: Insulin delivery using pen devices. Simple-to-use tools may help young and old alike - pubmed.ncbi.nlm.nih.gov	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials) (evidence)
why-your-peptide-pen-is-silently-wasting-your-vials:source-pmc-ncbi-nlm-nih-gov-2	source	Why your peptide pen is silently wasting your vials	cites	Jonker et al., Int J Clin Pharmacol Ther 2021: First pre-filled pen device with highly purified human menopausal gonadotropin (HP-hMG, Menopur) in liquid is shown to be bioequivalent to powder for reconstitution - pmc.ncbi.nlm.nih.gov	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials) (evidence)
why-your-peptide-pen-is-silently-wasting-your-vials:source-pmc-ncbi-nlm-nih-gov-3	source	Why your peptide pen is silently wasting your vials	cites	Lingen et al., Endocr Connect 2023: Advantages and disadvantages of connected insulin pens in diabetes management - pmc.ncbi.nlm.nih.gov	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials) (evidence)

FAQ

What is dead volume in a peptide pen?: Dead volume is the liquid left trapped in the cartridge tip and needle hub after dispensing, which can be a significant percentage of your total reconstituted sample in poorly designed pens.
Why use glass cartridges instead of plastic?: Neither glass nor plastic is perfectly inert: glass flakes due to chemical delamination have been observed in parenteral liquid formulations after long-term storage (Jiang et al. 2013), the unpredictable nature of peptide binding to surfaces requires optimization of experimental containers (Goebel-Stengel et al. 2011), and cetrorelix adsorbed more to glass than to polypropylene (Grohganz et al. 2004).
Can I store reconstituted peptide in the pen?: It is not recommended. Store your reconstituted peptide solution in a sealed vial under proper conditions. Fill the pen's cartridge directly from this vial just before your bench work.