# Why your peptide pen is silently wasting your vials - facts

Canonical page: https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials
Type: Lab article

## 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 | Evidence |
|---|---|---|---|---|---|---|
| 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) | https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials |
| 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) | https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials |
| 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) | https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials |
| 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) | https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials |
| 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) | https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials |
| 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) | https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials |
| 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) | https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials |
| 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) | https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials |
| 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) | https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials |
| 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) | https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials |
| 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) | https://www.preppinpeppers.com/blogs/the-lab/why-your-peptide-pen-is-silently-wasting-your-vials |
| 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) | https://pubmed.ncbi.nlm.nih.gov/23872443/ |
| 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) | https://pmc.ncbi.nlm.nih.gov/articles/PMC3290000/ |
| 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) | https://pubmed.ncbi.nlm.nih.gov/14757490/ |
| 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) | https://www.preppinpeppers.com/products/gansulin-metal-peptide-pen |
| 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) | https://www.preppinpeppers.com/products/gansulin-3ml-cartridge |
| 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) | https://pubmed.ncbi.nlm.nih.gov/10560468/ |
| 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) | https://pmc.ncbi.nlm.nih.gov/articles/PMC8594316/ |
| 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) | https://pmc.ncbi.nlm.nih.gov/articles/PMC10563601/ |

## 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.

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