# Stop Wasting Peptides: The Dirty Secret of “Peppy Pens” - facts

Canonical page: https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens
Type: Lab article

## TL;DR

A peptide pen is a metal instrument that holds high-tolerance glass cartridges. Its accuracy depends on build, cartridge tolerance, dead volume and technique.

## Facts Index

| Fact ID | Category | Entity | Attribute | Value | Source | Evidence |
|---|---|---|---|---|---|---|
| stop-wasting-peptides-the-dirty-secret-of-peppy-pens:title | identity | Stop Wasting Peptides: The Dirty Secret of “Peppy Pens” | title | Stop Wasting Peptides: The Dirty Secret of “Peppy Pens” | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens) | https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens |
| stop-wasting-peptides-the-dirty-secret-of-peppy-pens:published | identity | Stop Wasting Peptides: The Dirty Secret of “Peppy Pens” | published | 2026-08-15 | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens) | https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens |
| stop-wasting-peptides-the-dirty-secret-of-peppy-pens:author | identity | Stop Wasting Peptides: The Dirty Secret of “Peppy Pens” | author | Preppin' Peppers Editorial Team | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens) | https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens |
| stop-wasting-peptides-the-dirty-secret-of-peppy-pens:topics | identity | Stop Wasting Peptides: The Dirty Secret of “Peppy Pens” | topics | peppy pens, peptide pen, reconstitution, research | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens) | https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens |
| stop-wasting-peptides-the-dirty-secret-of-peppy-pens:summary | content | Stop Wasting Peptides: The Dirty Secret of “Peppy Pens” | summary | A peptide pen is a metal instrument that holds high-tolerance glass cartridges. Its accuracy depends on build, cartridge tolerance, dead volume and technique. | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens) | https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens |
| stop-wasting-peptides-the-dirty-secret-of-peppy-pens:section-1 | content | Stop Wasting Peptides: The Dirty Secret of “Peppy Pens” | section | What It Is | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens) | https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens |
| stop-wasting-peptides-the-dirty-secret-of-peppy-pens:section-2 | content | Stop Wasting Peptides: The Dirty Secret of “Peppy Pens” | section | The Core Trade-Off: Metal Body vs. Plastic Construction | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens) | https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens |
| stop-wasting-peptides-the-dirty-secret-of-peppy-pens:section-3 | content | Stop Wasting Peptides: The Dirty Secret of “Peppy Pens” | section | Why Glass Cartridge Tolerances Are Everything | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens) | https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens |
| stop-wasting-peptides-the-dirty-secret-of-peppy-pens:section-4 | content | Stop Wasting Peptides: The Dirty Secret of “Peppy Pens” | section | Click-Dial Accuracy, Dead Volume, and the First Click | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens) | https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens |
| stop-wasting-peptides-the-dirty-secret-of-peppy-pens:section-5 | content | Stop Wasting Peptides: The Dirty Secret of “Peppy Pens” | section | Diluent Choice and Handling During Reconstitution | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens) | https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens |
| stop-wasting-peptides-the-dirty-secret-of-peppy-pens:section-6 | content | Stop Wasting Peptides: The Dirty Secret of “Peppy Pens” | section | A Practical Workflow for Accurate Bench Dispensing | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens) | https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens |
| stop-wasting-peptides-the-dirty-secret-of-peppy-pens:section-8 | content | Stop Wasting Peptides: The Dirty Secret of “Peppy Pens” | section | What the research community gets wrong about peptide pens ("peppy pens") | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens) | https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens |
| stop-wasting-peptides-the-dirty-secret-of-peppy-pens:product-gansulin-metal-peptide-pen | products | Stop Wasting Peptides: The Dirty Secret of “Peppy Pens” | references product | Gansulin Pen · Reusable Click-Dial, 3 ml (1-60 Units) | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens) | https://www.preppinpeppers.com/products/gansulin-metal-peptide-pen |
| stop-wasting-peptides-the-dirty-secret-of-peppy-pens:product-gansulin-3ml-cartridge | products | Stop Wasting Peptides: The Dirty Secret of “Peppy Pens” | references product | Gansulin-Compatible 3 ml Glass Cartridge for Pens (10-Pack) | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens) | https://www.preppinpeppers.com/products/gansulin-3ml-cartridge |
| stop-wasting-peptides-the-dirty-secret-of-peppy-pens:source-pubmed-ncbi-nlm-nih-gov | source | Stop Wasting Peptides: The Dirty Secret of “Peppy Pens” | cites | Sparre et al., J Diabetes Sci Technol 2023: Factors Affecting Performance of Insulin Pen Injector Technology: A Narrative Review - pubmed.ncbi.nlm.nih.gov | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens) | https://pubmed.ncbi.nlm.nih.gov/36540004/ |
| stop-wasting-peptides-the-dirty-secret-of-peppy-pens:source-pubmed-ncbi-nlm-nih-gov-2 | source | Stop Wasting Peptides: The Dirty Secret of “Peppy Pens” | cites | Gnanalingham et al., Arch Dis Child 1998: Accuracy and reproducibility of low dose insulin administration using pen-injectors and syringes - pubmed.ncbi.nlm.nih.gov | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens) | https://pubmed.ncbi.nlm.nih.gov/9771255/ |
| stop-wasting-peptides-the-dirty-secret-of-peppy-pens:source-pubmed-ncbi-nlm-nih-gov-3 | source | Stop Wasting Peptides: The Dirty Secret of “Peppy Pens” | 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/stop-wasting-peptides-the-dirty-secret-of-peppy-pens) | https://pubmed.ncbi.nlm.nih.gov/10560468/ |
| stop-wasting-peptides-the-dirty-secret-of-peppy-pens:source-dailymed-nlm-nih-gov | source | Stop Wasting Peptides: The Dirty Secret of “Peppy Pens” | cites | Bacteriostatic Water for Injection, USP: FDA label on DailyMed, U.S. National Library of Medicine (0.9% benzyl alcohol) - dailymed.nlm.nih.gov | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens) | https://dailymed.nlm.nih.gov/dailymed/lookup.cfm?setid=87d6e9dc-fe3b-4593-ac9a-d7493d1959c7 |
| stop-wasting-peptides-the-dirty-secret-of-peppy-pens:source-pubmed-ncbi-nlm-nih-gov-4 | source | Stop Wasting Peptides: The Dirty Secret of “Peppy Pens” | cites | Duerkop et al., Biotechnol J 2018: Impact of Cavitation, High Shear Stress and Air/Liquid Interfaces on Protein Aggregation - pubmed.ncbi.nlm.nih.gov | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens) | https://pubmed.ncbi.nlm.nih.gov/29575605/ |
| stop-wasting-peptides-the-dirty-secret-of-peppy-pens:source-www-sigmaaldrich-com | source | Stop Wasting Peptides: The Dirty Secret of “Peppy Pens” | cites | Sigma-Aldrich (Merck): Handling and Storage Guidelines for Peptides and Proteins - www.sigmaaldrich.com | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-wasting-peptides-the-dirty-secret-of-peppy-pens) | https://www.sigmaaldrich.com/US/en/technical-documents/technical-article/research-and-disease-areas/cell-and-developmental-biology-research/handling-and-storage |

## FAQ

### What is dead volume in a peptide pen cartridge?

Dead volume is the small amount of liquid (typically 0.02-0.05 ml) trapped in the needle hub and cartridge tip after dispensing. It is not expelled and must be accounted for in calculations.

### How do I choose between a metal and plastic peptide pen?

Choose a metal pen for durability and reliable cleaning between samples. Plastic pens are lighter and cheaper but may degrade with solvent exposure over time.

### Why is my first click inconsistent?

The cartridge may contain air. After attaching a filled cartridge, prime the pen by clicking over a waste container until a full liquid drop appears at the tip before accurate dispensing.

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