Original price was: £5.00.£4.50Current price is: £4.50.
Ultra-fine 31G (0.25mm) x 6mm pen needles for precision laboratory injection research. Individually sterile-sealed, single-use. Universal pen needle thread — compatible with the Optimised Lifestyle Peptide Pen Injector and all standard 3ml pen systems. Pack of 10. For laboratory research use only.
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In stock
Ultra-fine peptide needles — 0.25mm diameter x 6mm, designed for use with standard 3ml cartridge injection pen systems. Compatible with the Optimised Lifestyle Peptide Pen Injector and all standard ISO-compliant pen needle connectors.
31G x 6mm is the standard needle size for peptide research — the specification used in precision laboratory injection protocols requiring minimal tissue disruption and accurate, repeatable delivery volumes. Supplied as a pack of 10 individually sealed sterile needles.
Prefer a shorter, finer needle? The 32G x 4mm pen needles are also available in packs of 10. Not sure which to choose? Read the peptide needle size guide.
| Gauge | 31G (0.25mm diameter) |
| Length | 6mm |
| Pack size | 10 needles |
| Connector | Universal pen needle thread — fits all standard pen injectors |
| Sterility | Individually sealed, sterile single-use |
| Use | Single use — laboratory research only |
31G x 6mm is the standard specification for peptide research work — fine enough to minimise tissue disruption while long enough for consistent delivery depth. Where a research protocol calls for the shallowest possible penetration, the finer 32G x 4mm is the alternative. The peptide needle size guide compares every standard gauge and length.
Yes. They use the universal pen needle thread, so they fit the Optimised Lifestyle Peptide Pen Injector, the Peptide Pen Kit, and any standard ISO-compliant 3ml cartridge pen system.
Each pack contains 10 individually sterile-sealed needles. They are strictly single-use: a needle should be attached immediately before use and disposed of in a sharps container straight after. Reuse compromises sterility and blunts the tip.
⚠️ For laboratory research use only. Single use. Dispose of safely after each use in an appropriate sharps container. Not for human clinical use.
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Claire Ashworth –
Really pleased with these. Individually sealed, clean sterile packaging, and they thread onto the pen injector without any fuss. The 31G gauge is exactly right — very fine. Ordered alongside some cartridges from Optimised Lifestyle and everything arrived together quickly. Will keep these as my go-to.
Mark Ellison –
These are now my standard needles. 31G x 6mm is the correct spec and the quality is consistently good across the pack. No bent tips, no issues with the thread. Optimised Lifestyle dispatched same day and I had them next morning. Cannot fault it.
Rachel Pemberton –
Solid needles. Fine gauge, clean tip, individual sterile packaging. They fit the pen injector I bought from Optimised Lifestyle without any issues. Delivery was tracked and arrived in two days. Deducting one star only because I wish they came in a pack of 20 — but the product itself is excellent.
Daniel Forsythe –
Good quality pen needles. They thread on smoothly, no cross-threading, and the seal is clean. 6mm is the right length. Ordered on a Tuesday and had them Thursday. Optimised Lifestyle are clearly a reliable supplier — this is my second order from them.
Sarah Mullen –
Exactly what I needed. 31G is the right gauge for this kind of work — minimal discomfort and very precise. The needles are individually sealed which is reassuring. Delivery from Optimised Lifestyle was fast and discreet. Good value for money.
James Thornton –
These fit my pen injector perfectly — universal thread and no leaks. The gauge is fine enough that I barely notice the injection. Pack of 10 is a reasonable quantity. Arrived quickly from Optimised Lifestyle, well packaged. Will be reordering.
Katherine Addams –
They’re the perfect size for the pens! Well packaged as well, they’re individually done and never have any rips or tears or issues. They arrived 2 days after I ordered and work really well, absolutely perfect.