What is dead volume in a peptide pen cartridge?

Dead volume is the small amount of liquid trapped in the cartridge tip and internal channel that cannot be expelled. In 3 ml glass cartridges it ranges from 0.06 to 0.15 ml depending on cartridge geometry and diluent viscosity.

How do I verify my v3 pen's metering accuracy?

Fill a cartridge with bacteriostatic water, draw 0.50 ml (50 units; the V3 sets up to 60 units, 0.60 ml, per draw), push it into a graduated cylinder, and read the volume. Repeat ten times. A well-calibrated v3 peptide pen should hold within 0.02 ml of the target across all trials.

Can I use any diluent with the v3 peptide pen?

Bacteriostatic water works best for consistent flow and dead volume. More viscous diluents like acetic acid solutions slightly increase dead volume. Avoid salt-containing buffers unless required, as salt crystals can scratch the glass bore.

PreppinPeppers › Facts › Lab article

Your Peptide Pen’s Dead Volume Is Costing You Real Money

Machine-readable facts for this Lab article. The full page is https://www.preppinpeppers.com/blogs/the-lab/your-peptide-pens-dead-volume-is-costing-you-real-money.

TL;DR

A reusable aluminium-alloy pen body holds a 3 ml glass cartridge and meters by draw-and-push. Here's how dead volume in your pen setup costs you real money.

Facts Index

Fact ID	Category	Entity	Attribute	Value	Source
your-peptide-pens-dead-volume-is-costing-you-real-money:title	identity	Your Peptide Pen’s Dead Volume Is Costing You Real Money	title	Your Peptide Pen’s Dead Volume Is Costing You Real Money	Lab article (https://www.preppinpeppers.com/blogs/the-lab/your-peptide-pens-dead-volume-is-costing-you-real-money) (evidence)
your-peptide-pens-dead-volume-is-costing-you-real-money:published	identity	Your Peptide Pen’s Dead Volume Is Costing You Real Money	published	2026-08-15	Lab article (https://www.preppinpeppers.com/blogs/the-lab/your-peptide-pens-dead-volume-is-costing-you-real-money) (evidence)
your-peptide-pens-dead-volume-is-costing-you-real-money:author	identity	Your Peptide Pen’s Dead Volume Is Costing You Real Money	author	Preppin' Peppers Editorial Team	Lab article (https://www.preppinpeppers.com/blogs/the-lab/your-peptide-pens-dead-volume-is-costing-you-real-money) (evidence)
your-peptide-pens-dead-volume-is-costing-you-real-money:topics	identity	Your Peptide Pen’s Dead Volume Is Costing You Real Money	topics	peptide pen, reconstitution, research, v3 peptide pen	Lab article (https://www.preppinpeppers.com/blogs/the-lab/your-peptide-pens-dead-volume-is-costing-you-real-money) (evidence)
your-peptide-pens-dead-volume-is-costing-you-real-money:summary	content	Your Peptide Pen’s Dead Volume Is Costing You Real Money	summary	A reusable aluminium-alloy pen body holds a 3 ml glass cartridge and meters by draw-and-push. Here's how dead volume in your pen setup costs you real money.	Lab article (https://www.preppinpeppers.com/blogs/the-lab/your-peptide-pens-dead-volume-is-costing-you-real-money) (evidence)
your-peptide-pens-dead-volume-is-costing-you-real-money:section-1	content	Your Peptide Pen’s Dead Volume Is Costing You Real Money	section	What it is	Lab article (https://www.preppinpeppers.com/blogs/the-lab/your-peptide-pens-dead-volume-is-costing-you-real-money) (evidence)
your-peptide-pens-dead-volume-is-costing-you-real-money:section-2	content	Your Peptide Pen’s Dead Volume Is Costing You Real Money	section	Why a Metal Body Beats Plastic for a Reconstitution Pen	Lab article (https://www.preppinpeppers.com/blogs/the-lab/your-peptide-pens-dead-volume-is-costing-you-real-money) (evidence)
your-peptide-pens-dead-volume-is-costing-you-real-money:section-3	content	Your Peptide Pen’s Dead Volume Is Costing You Real Money	section	Glass Cartridge Tolerances and the Dead Volume Problem	Lab article (https://www.preppinpeppers.com/blogs/the-lab/your-peptide-pens-dead-volume-is-costing-you-real-money) (evidence)
your-peptide-pens-dead-volume-is-costing-you-real-money:section-4	content	Your Peptide Pen’s Dead Volume Is Costing You Real Money	section	Draw-and-Push Metering: Where Most of Your Accuracy Lives or Dies	Lab article (https://www.preppinpeppers.com/blogs/the-lab/your-peptide-pens-dead-volume-is-costing-you-real-money) (evidence)
your-peptide-pens-dead-volume-is-costing-you-real-money:section-5	content	Your Peptide Pen’s Dead Volume Is Costing You Real Money	section	Diluent Choice Directly Affects Your Pen's Performance	Lab article (https://www.preppinpeppers.com/blogs/the-lab/your-peptide-pens-dead-volume-is-costing-you-real-money) (evidence)
your-peptide-pens-dead-volume-is-costing-you-real-money:section-6	content	Your Peptide Pen’s Dead Volume Is Costing You Real Money	section	Making the V3 Part of a Repeatable Bench Routine	Lab article (https://www.preppinpeppers.com/blogs/the-lab/your-peptide-pens-dead-volume-is-costing-you-real-money) (evidence)
your-peptide-pens-dead-volume-is-costing-you-real-money:section-8	content	Your Peptide Pen’s Dead Volume Is Costing You Real Money	section	What the research community gets wrong about peptide reconstitution pens and dead volume	Lab article (https://www.preppinpeppers.com/blogs/the-lab/your-peptide-pens-dead-volume-is-costing-you-real-money) (evidence)
your-peptide-pens-dead-volume-is-costing-you-real-money:product-gansulin-metal-peptide-pen	products	Your Peptide Pen’s Dead Volume Is Costing You Real Money	references product	Gansulin Pen · Reusable Click-Dial, 3 ml (1-60 Units)	Lab article (https://www.preppinpeppers.com/blogs/the-lab/your-peptide-pens-dead-volume-is-costing-you-real-money) (evidence)
your-peptide-pens-dead-volume-is-costing-you-real-money:product-gansulin-3ml-cartridge	products	Your Peptide Pen’s Dead Volume Is Costing You Real Money	references product	Gansulin-Compatible 3 ml Glass Cartridge for Pens (10-Pack)	Lab article (https://www.preppinpeppers.com/blogs/the-lab/your-peptide-pens-dead-volume-is-costing-you-real-money) (evidence)
your-peptide-pens-dead-volume-is-costing-you-real-money:source-pubmed-ncbi-nlm-nih-gov	source	Your Peptide Pen’s Dead Volume Is Costing You Real Money	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/your-peptide-pens-dead-volume-is-costing-you-real-money) (evidence)
your-peptide-pens-dead-volume-is-costing-you-real-money:source-pubmed-ncbi-nlm-nih-gov-2	source	Your Peptide Pen’s Dead Volume Is Costing You Real Money	cites	Chaves et al., Rev Esc Enferm USP 2017: Residual volume in vials of antibiotics used in pediatrics - pubmed.ncbi.nlm.nih.gov	Lab article (https://www.preppinpeppers.com/blogs/the-lab/your-peptide-pens-dead-volume-is-costing-you-real-money) (evidence)
your-peptide-pens-dead-volume-is-costing-you-real-money:source-dailymed-nlm-nih-gov	source	Your Peptide Pen’s Dead Volume Is Costing You Real Money	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/your-peptide-pens-dead-volume-is-costing-you-real-money) (evidence)

FAQ

What is dead volume in a peptide pen cartridge?: Dead volume is the small amount of liquid trapped in the cartridge tip and internal channel that cannot be expelled. In 3 ml glass cartridges it ranges from 0.06 to 0.15 ml depending on cartridge geometry and diluent viscosity.
How do I verify my v3 pen's metering accuracy?: Fill a cartridge with bacteriostatic water, draw 0.50 ml (50 units; the V3 sets up to 60 units, 0.60 ml, per draw), push it into a graduated cylinder, and read the volume. Repeat ten times. A well-calibrated v3 peptide pen should hold within 0.02 ml of the target across all trials.
Can I use any diluent with the v3 peptide pen?: Bacteriostatic water works best for consistent flow and dead volume. More viscous diluents like acetic acid solutions slightly increase dead volume. Avoid salt-containing buffers unless required, as salt crystals can scratch the glass bore.