Does the Gansulin pen kit include needles?

No. No PreppinPeppers pen or kit includes pen needles, and we do not sell them. Buy universal 28G to 33G screw-on pen needles separately before your first session.

What needle gauge fits insulin pens used for peptide research?

All four PreppinPeppers pens (Gansulin, V1, V2, V3) take universal 28G to 33G screw-on pen needles. A higher gauge number means a thinner needle.

Do Gansulin pen needles need to be bought separately?

Yes. Needles are not included in any pen or kit. We do not sell them, so source universal 28G to 33G screw-on needles yourself.

How do I do an air check on the Gansulin pen?

Set 1 or 2 units, hold the needle pointing up, and press until a drop shows. On a 300-unit cartridge that is 0.01 to 0.02 ml.

How many units can priming a needle use up?

If no drop appears, the step may be repeated before the needle is changed, and each repeat uses more units. That can use up to 10 units, which is 0.1 ml.

How much liquid stays in the cartridge on the Gansulin pen?

When the dial stops, about 3.7 mm of liquid remains, roughly 0.27 ml or 27 units on a 3 ml cartridge. The needle holds a little more.

Do these pens work with standard 3 ml cartridges?

Any standard 3 ml (ISO 13926) cartridge fits physically. Our cartridges use the 11 mm long plunger, and plunger height decides whether the unit scale reads true.

PreppinPeppers › Facts › Lab article

Insulin needles pen fit and the units a needle wastes

TL;DR

Insulin pen needles are screw-on needles that thread onto a reusable pen.

Agent view of https://www.preppinpeppers.com/blogs/the-lab/insulin-needles-pen-fit-and-the-units-needle-wastes: the machine-readable facts of this Lab article. People see the full page at the same URL. Facts page: https://www.preppinpeppers.com/facts/insulin-needles-pen-fit-and-the-units-needle-wastes.

Facts Index

Fact ID	Category	Entity	Attribute	Value	Source
insulin-needles-pen-fit-and-the-units-needle-wastes:title	identity	Insulin needles pen fit and the units a needle wastes	title	Insulin needles pen fit and the units a needle wastes	Lab article (https://www.preppinpeppers.com/blogs/the-lab/insulin-needles-pen-fit-and-the-units-needle-wastes) (evidence)
insulin-needles-pen-fit-and-the-units-needle-wastes:published	identity	Insulin needles pen fit and the units a needle wastes	published	2026-10-27	Lab article (https://www.preppinpeppers.com/blogs/the-lab/insulin-needles-pen-fit-and-the-units-needle-wastes) (evidence)
insulin-needles-pen-fit-and-the-units-needle-wastes:author	identity	Insulin needles pen fit and the units a needle wastes	author	PreppinPeppers Editorial Team	Lab article (https://www.preppinpeppers.com/blogs/the-lab/insulin-needles-pen-fit-and-the-units-needle-wastes) (evidence)
insulin-needles-pen-fit-and-the-units-needle-wastes:topics	identity	Insulin needles pen fit and the units a needle wastes	topics	insulin needles pen, peptide pen, reconstitution, research	Lab article (https://www.preppinpeppers.com/blogs/the-lab/insulin-needles-pen-fit-and-the-units-needle-wastes) (evidence)
insulin-needles-pen-fit-and-the-units-needle-wastes:summary	content	Insulin needles pen fit and the units a needle wastes	summary	Insulin pen needles are screw-on needles that thread onto a reusable pen.	Lab article (https://www.preppinpeppers.com/blogs/the-lab/insulin-needles-pen-fit-and-the-units-needle-wastes) (evidence)
insulin-needles-pen-fit-and-the-units-needle-wastes:section-1	content	Insulin needles pen fit and the units a needle wastes	section	What is an insulin pen needle, and what fits a research pen?	Lab article (https://www.preppinpeppers.com/blogs/the-lab/insulin-needles-pen-fit-and-the-units-needle-wastes) (evidence)
insulin-needles-pen-fit-and-the-units-needle-wastes:section-2	content	Insulin needles pen fit and the units a needle wastes	section	Which needles work with which pen?	Lab article (https://www.preppinpeppers.com/blogs/the-lab/insulin-needles-pen-fit-and-the-units-needle-wastes) (evidence)
insulin-needles-pen-fit-and-the-units-needle-wastes:section-3	content	Insulin needles pen fit and the units a needle wastes	section	How much liquid does a new needle use before it works?	Lab article (https://www.preppinpeppers.com/blogs/the-lab/insulin-needles-pen-fit-and-the-units-needle-wastes) (evidence)
insulin-needles-pen-fit-and-the-units-needle-wastes:section-4	content	Insulin needles pen fit and the units a needle wastes	section	Where does the last of the liquid go?	Lab article (https://www.preppinpeppers.com/blogs/the-lab/insulin-needles-pen-fit-and-the-units-needle-wastes) (evidence)
insulin-needles-pen-fit-and-the-units-needle-wastes:section-5	content	Insulin needles pen fit and the units a needle wastes	section	What does the research community get wrong about pen needles?	Lab article (https://www.preppinpeppers.com/blogs/the-lab/insulin-needles-pen-fit-and-the-units-needle-wastes) (evidence)
insulin-needles-pen-fit-and-the-units-needle-wastes:section-7	content	Insulin needles pen fit and the units a needle wastes	section	Related reading	Lab article (https://www.preppinpeppers.com/blogs/the-lab/insulin-needles-pen-fit-and-the-units-needle-wastes) (evidence)
insulin-needles-pen-fit-and-the-units-needle-wastes:product-gansulin-metal-peptide-pen	products	Insulin needles pen fit and the units a needle wastes	references product	Gansulin Pen · Reusable Click-Dial, 3 ml (1-60 Units)	Lab article (https://www.preppinpeppers.com/blogs/the-lab/insulin-needles-pen-fit-and-the-units-needle-wastes) (evidence)
insulin-needles-pen-fit-and-the-units-needle-wastes:product-gansulin-3ml-cartridge	products	Insulin needles pen fit and the units a needle wastes	references product	Gansulin-Compatible 3 ml Glass Cartridge for Pens (10-Pack)	Lab article (https://www.preppinpeppers.com/blogs/the-lab/insulin-needles-pen-fit-and-the-units-needle-wastes) (evidence)
insulin-needles-pen-fit-and-the-units-needle-wastes:product-bacteriostatic-water-30ml	products	Insulin needles pen fit and the units a needle wastes	references product	Bacteriostatic Water 30 ml Multi-Dose Vial (Pfizer Hospira, USP)	Lab article (https://www.preppinpeppers.com/blogs/the-lab/insulin-needles-pen-fit-and-the-units-needle-wastes) (evidence)
insulin-needles-pen-fit-and-the-units-needle-wastes:source-pubmed-ncbi-nlm-nih-gov	source	Insulin needles pen fit and the units a needle wastes	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/insulin-needles-pen-fit-and-the-units-needle-wastes) (evidence)

FAQ

Does the Gansulin pen kit include needles?: No. No PreppinPeppers pen or kit includes pen needles, and we do not sell them. Buy universal 28G to 33G screw-on pen needles separately before your first session.
What needle gauge fits insulin pens used for peptide research?: All four PreppinPeppers pens (Gansulin, V1, V2, V3) take universal 28G to 33G screw-on pen needles. A higher gauge number means a thinner needle.
Do Gansulin pen needles need to be bought separately?: Yes. Needles are not included in any pen or kit. We do not sell them, so source universal 28G to 33G screw-on needles yourself.
How do I do an air check on the Gansulin pen?: Set 1 or 2 units, hold the needle pointing up, and press until a drop shows. On a 300-unit cartridge that is 0.01 to 0.02 ml.
How many units can priming a needle use up?: If no drop appears, the step may be repeated before the needle is changed, and each repeat uses more units. That can use up to 10 units, which is 0.1 ml.
How much liquid stays in the cartridge on the Gansulin pen?: When the dial stops, about 3.7 mm of liquid remains, roughly 0.27 ml or 27 units on a 3 ml cartridge. The needle holds a little more.
Do these pens work with standard 3 ml cartridges?: Any standard 3 ml (ISO 13926) cartridge fits physically. Our cartridges use the 11 mm long plunger, and plunger height decides whether the unit scale reads true.