What is dead volume in a peptide pen cartridge?

Dead volume is the liquid trapped between the cartridge tip and the needle hub that never exits. On a standard 3 ml cartridge it is typically 5 to 15 microliters and must be planned for when calculating how many doses a fill yields.

How do I check if my vigor peptide pen is dosing accurately?

Load a cartridge with bacteriostatic water, purge air, dial 10 units, and dispense into a tared tube on a precision balance. 100 microliters of water weighs 100 mg; repeat three times and average. Accuracy within 2 to 3 percent is expected from a quality pen.

Why does a metal peptide pen barrel perform better than plastic?

Metal barrels do not flex under grip pressure, hold cartridges concentrically at tighter tolerances, and are inert to the solvents common at a peptide bench. Plastic barrels can flex during plunger depression and craze if exposed to trace organic solvents.

PreppinPeppers › Facts › Lab article

Why your vigor peptide pen dial reading may be off

Machine-readable facts for this Lab article. The full page is https://www.preppinpeppers.com/blogs/the-lab/why-your-vigor-peptide-pen-dial-reading-may-off.

TL;DR

A vigor pen's dial sets plunger travel, not delivered volume. Verifying dispensed volume gravimetrically confirms accuracy beyond what the dial reading shows.

Facts Index

Fact ID	Category	Entity	Attribute	Value	Source
why-your-vigor-peptide-pen-dial-reading-may-off:title	identity	Why your vigor peptide pen dial reading may be off	title	Why your vigor peptide pen dial reading may be off	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-vigor-peptide-pen-dial-reading-may-off) (evidence)
why-your-vigor-peptide-pen-dial-reading-may-off:published	identity	Why your vigor peptide pen dial reading may be off	published	2026-08-15	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-vigor-peptide-pen-dial-reading-may-off) (evidence)
why-your-vigor-peptide-pen-dial-reading-may-off:author	identity	Why your vigor peptide pen dial reading may be off	author	Preppin' Peppers Editorial Team	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-vigor-peptide-pen-dial-reading-may-off) (evidence)
why-your-vigor-peptide-pen-dial-reading-may-off:topics	identity	Why your vigor peptide pen dial reading may be off	topics	peptide pen, reconstitution, research, vigor peptide pens	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-vigor-peptide-pen-dial-reading-may-off) (evidence)
why-your-vigor-peptide-pen-dial-reading-may-off:summary	content	Why your vigor peptide pen dial reading may be off	summary	A vigor pen's dial sets plunger travel, not delivered volume. Verifying dispensed volume gravimetrically confirms accuracy beyond what the dial reading shows.	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-vigor-peptide-pen-dial-reading-may-off) (evidence)
why-your-vigor-peptide-pen-dial-reading-may-off:section-1	content	Why your vigor peptide pen dial reading may be off	section	What it is	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-vigor-peptide-pen-dial-reading-may-off) (evidence)
why-your-vigor-peptide-pen-dial-reading-may-off:section-2	content	Why your vigor peptide pen dial reading may be off	section	Metal barrel versus plastic: why the body material changes your numbers	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-vigor-peptide-pen-dial-reading-may-off) (evidence)
why-your-vigor-peptide-pen-dial-reading-may-off:section-3	content	Why your vigor peptide pen dial reading may be off	section	Glass cartridge tolerances and the dead volume problem	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-vigor-peptide-pen-dial-reading-may-off) (evidence)
why-your-vigor-peptide-pen-dial-reading-may-off:section-4	content	Why your vigor peptide pen dial reading may be off	section	Verifying your pen's actual delivery before you trust the dial	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-vigor-peptide-pen-dial-reading-may-off) (evidence)
why-your-vigor-peptide-pen-dial-reading-may-off:section-5	content	Why your vigor peptide pen dial reading may be off	section	Diluent choice and storage: the details that protect your stock	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-vigor-peptide-pen-dial-reading-may-off) (evidence)
why-your-vigor-peptide-pen-dial-reading-may-off:section-6	content	Why your vigor peptide pen dial reading may be off	section	Four bench mistakes that waste expensive cartridge fills	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-vigor-peptide-pen-dial-reading-may-off) (evidence)
why-your-vigor-peptide-pen-dial-reading-may-off:section-8	content	Why your vigor peptide pen dial reading may be off	section	Related reading	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-vigor-peptide-pen-dial-reading-may-off) (evidence)
why-your-vigor-peptide-pen-dial-reading-may-off:section-9	content	Why your vigor peptide pen dial reading may be off	section	What the research community gets wrong about Vigor peptide pens	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-vigor-peptide-pen-dial-reading-may-off) (evidence)
why-your-vigor-peptide-pen-dial-reading-may-off:product-gansulin-metal-peptide-pen	products	Why your vigor peptide pen dial reading may be off	references product	Gansulin Pen · Reusable Click-Dial, 3 ml (1-60 Units)	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-vigor-peptide-pen-dial-reading-may-off) (evidence)
why-your-vigor-peptide-pen-dial-reading-may-off:product-gansulin-3ml-cartridge	products	Why your vigor peptide pen dial reading may be off	references product	Gansulin-Compatible 3 ml Glass Cartridge for Pens (10-Pack)	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-vigor-peptide-pen-dial-reading-may-off) (evidence)
why-your-vigor-peptide-pen-dial-reading-may-off:source-pubchem-ncbi-nlm-nih-gov	source	Why your vigor peptide pen dial reading may be off	cites	NCBI PubChem CID 244: Benzyl Alcohol (C7H8O) - pubchem.ncbi.nlm.nih.gov	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-vigor-peptide-pen-dial-reading-may-off) (evidence)
why-your-vigor-peptide-pen-dial-reading-may-off:source-pubchem-ncbi-nlm-nih-gov-2	source	Why your vigor peptide pen dial reading may be off	cites	NCBI PubChem CID 176: Acetic Acid (C2H4O2) - pubchem.ncbi.nlm.nih.gov	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-vigor-peptide-pen-dial-reading-may-off) (evidence)
why-your-vigor-peptide-pen-dial-reading-may-off:source-pubmed-ncbi-nlm-nih-gov	source	Why your vigor peptide pen dial reading may be off	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-vigor-peptide-pen-dial-reading-may-off) (evidence)
why-your-vigor-peptide-pen-dial-reading-may-off:source-pmc-ncbi-nlm-nih-gov	source	Why your vigor peptide pen dial reading may be off	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-vigor-peptide-pen-dial-reading-may-off) (evidence)
why-your-vigor-peptide-pen-dial-reading-may-off:source-dailymed-nlm-nih-gov	source	Why your vigor peptide pen dial reading may be off	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/why-your-vigor-peptide-pen-dial-reading-may-off) (evidence)
why-your-vigor-peptide-pen-dial-reading-may-off:source-www-sigmaaldrich-com	source	Why your vigor peptide pen dial reading may be off	cites	Sigma-Aldrich (Merck): Handling and Storage Guidelines for Peptides and Proteins - www.sigmaaldrich.com	Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-your-vigor-peptide-pen-dial-reading-may-off) (evidence)

FAQ

What is dead volume in a peptide pen cartridge?: Dead volume is the liquid trapped between the cartridge tip and the needle hub that never exits. On a standard 3 ml cartridge it is typically 5 to 15 microliters and must be planned for when calculating how many doses a fill yields.
How do I check if my vigor peptide pen is dosing accurately?: Load a cartridge with bacteriostatic water, purge air, dial 10 units, and dispense into a tared tube on a precision balance. 100 microliters of water weighs 100 mg; repeat three times and average. Accuracy within 2 to 3 percent is expected from a quality pen.
Why does a metal peptide pen barrel perform better than plastic?: Metal barrels do not flex under grip pressure, hold cartridges concentrically at tighter tolerances, and are inert to the solvents common at a peptide bench. Plastic barrels can flex during plunger depression and craze if exposed to trace organic solvents.