# Stop losing your peptide when filling cartridges - facts

Canonical page: https://www.preppinpeppers.com/blogs/the-lab/stop-losing-your-peptide-when-filling-cartridges
Type: Lab article

## TL;DR

Cut compound loss when moving reconstituted solution into a glass cartridge: use a fine-gauge needle, draw slowly to limit bubbles and don't overfill it.

## Facts Index

| Fact ID | Category | Entity | Attribute | Value | Source | Evidence |
|---|---|---|---|---|---|---|
| stop-losing-your-peptide-when-filling-cartridges:title | identity | Stop losing your peptide when filling cartridges | title | Stop losing your peptide when filling cartridges | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-losing-your-peptide-when-filling-cartridges) | https://www.preppinpeppers.com/blogs/the-lab/stop-losing-your-peptide-when-filling-cartridges |
| stop-losing-your-peptide-when-filling-cartridges:published | identity | Stop losing your peptide when filling cartridges | published | 2026-08-15 | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-losing-your-peptide-when-filling-cartridges) | https://www.preppinpeppers.com/blogs/the-lab/stop-losing-your-peptide-when-filling-cartridges |
| stop-losing-your-peptide-when-filling-cartridges:author | identity | Stop losing your peptide when filling cartridges | author | Preppin' Peppers Editorial Team | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-losing-your-peptide-when-filling-cartridges) | https://www.preppinpeppers.com/blogs/the-lab/stop-losing-your-peptide-when-filling-cartridges |
| stop-losing-your-peptide-when-filling-cartridges:topics | identity | Stop losing your peptide when filling cartridges | topics | Guides, how-to, peptide guide | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-losing-your-peptide-when-filling-cartridges) | https://www.preppinpeppers.com/blogs/the-lab/stop-losing-your-peptide-when-filling-cartridges |
| stop-losing-your-peptide-when-filling-cartridges:summary | content | Stop losing your peptide when filling cartridges | summary | Cut compound loss when moving reconstituted solution into a glass cartridge: use a fine-gauge needle, draw slowly to limit bubbles and don't overfill it. | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-losing-your-peptide-when-filling-cartridges) | https://www.preppinpeppers.com/blogs/the-lab/stop-losing-your-peptide-when-filling-cartridges |
| stop-losing-your-peptide-when-filling-cartridges:section-1 | content | Stop losing your peptide when filling cartridges | section | What it is | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-losing-your-peptide-when-filling-cartridges) | https://www.preppinpeppers.com/blogs/the-lab/stop-losing-your-peptide-when-filling-cartridges |
| stop-losing-your-peptide-when-filling-cartridges:section-2 | content | Stop losing your peptide when filling cartridges | section | Why Transfer Matters More Than You'd Think | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-losing-your-peptide-when-filling-cartridges) | https://www.preppinpeppers.com/blogs/the-lab/stop-losing-your-peptide-when-filling-cartridges |
| stop-losing-your-peptide-when-filling-cartridges:section-3 | content | Stop losing your peptide when filling cartridges | section | The Step-by-Step Transfer Process | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-losing-your-peptide-when-filling-cartridges) | https://www.preppinpeppers.com/blogs/the-lab/stop-losing-your-peptide-when-filling-cartridges |
| stop-losing-your-peptide-when-filling-cartridges:section-4 | content | Stop losing your peptide when filling cartridges | section | What Goes Wrong and How to Fix It | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-losing-your-peptide-when-filling-cartridges) | https://www.preppinpeppers.com/blogs/the-lab/stop-losing-your-peptide-when-filling-cartridges |
| stop-losing-your-peptide-when-filling-cartridges:section-6 | content | Stop losing your peptide when filling cartridges | section | What the research community gets wrong about filling peptide cartridges | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-losing-your-peptide-when-filling-cartridges) | https://www.preppinpeppers.com/blogs/the-lab/stop-losing-your-peptide-when-filling-cartridges |
| stop-losing-your-peptide-when-filling-cartridges:product-gansulin-metal-peptide-pen | products | Stop losing your peptide when filling cartridges | references product | Gansulin Pen · Reusable Click-Dial, 3 ml (1-60 Units) | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-losing-your-peptide-when-filling-cartridges) | https://www.preppinpeppers.com/products/gansulin-metal-peptide-pen |
| stop-losing-your-peptide-when-filling-cartridges:product-gansulin-3ml-cartridge | products | Stop losing your peptide when filling cartridges | references product | Gansulin-Compatible 3 ml Glass Cartridge for Pens (10-Pack) | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-losing-your-peptide-when-filling-cartridges) | https://www.preppinpeppers.com/products/gansulin-3ml-cartridge |
| stop-losing-your-peptide-when-filling-cartridges:source-pmc-ncbi-nlm-nih-gov | source | Stop losing your peptide when filling cartridges | cites | Bee et al., Biotechnol Bioeng 2010: Aggregation of a monoclonal antibody induced by adsorption to stainless steel - pmc.ncbi.nlm.nih.gov | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-losing-your-peptide-when-filling-cartridges) | https://pmc.ncbi.nlm.nih.gov/articles/PMC3926213/ |
| stop-losing-your-peptide-when-filling-cartridges:source-pmc-ncbi-nlm-nih-gov-2 | source | Stop losing your peptide when filling cartridges | cites | Hollowell et al., Molecules 2020: Recent Advances in Studying Interfacial Adsorption of Bioengineered Monoclonal Antibodies - pmc.ncbi.nlm.nih.gov | Lab article (https://www.preppinpeppers.com/blogs/the-lab/stop-losing-your-peptide-when-filling-cartridges) | https://pmc.ncbi.nlm.nih.gov/articles/PMC7249052/ |

## FAQ

### What needle size should I use for transferring peptide to a cartridge?

A 30 or 31 gauge needle creates minimal dead volume and reduces peptide loss during transfer.

### Why does my peptide seem less potent after transferring to a cartridge?

Peptide can adsorb to glass and metal surfaces. Wetting the syringe before drawing and using a carrier protein like HSA can reduce this loss.

### Can I reuse the same needle for multiple transfers?

No. Needles dull after use and can introduce contamination. Use a fresh sterile needle for each transfer.

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