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La tua guida agli aghi per penna e siringhe 31G

31G is the ultra-fine end of the practical needle-gauge range — what GLP-1 pens (Mounjaro, Ozempic, Wegovy) ship with, and what most people switch to when they have been on weekly injections long enough to value comfort over draw-up speed. This site collects what we have learned about 31-gauge pen needles and syringes from running an EU supplier: what 4 mm vs 5 mm vs 6 mm actually changes, how to spot a counterfeit pen needle, and the rotation pattern that keeps a year on a GLP-1 from leaving your skin like a pin cushion.

We do not sell anything here. The articles below are the notes we send first-time GLP-1 buyers when they email asking which pen needle to order. If you decide a 31G is what you want, you can pick up a sterile pack at injectkit.com — but read the technique pages first. The needle is rarely the bottleneck; the angle, the speed and the spot are.

For thicker oils where 31G will clog or bend, see our sister site 29-g.com. For the all-rounder gauge, see 30-g.com.

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Recent articles

Practical, source-cited writing on 31G pen needles and syringes — from the team that ships them across the EU.

Subcutaneous Injection Sites: Abdomen, Thigh, Upper Arm Explained

Subcutaneous injection

Subcutaneous Injection Sites: Abdomen, Thigh, Upper Arm Explained

The three subcutaneous injection sites — abdomen, outer thigh, upper arm — compared on absorption speed, comfort, ease of self-injection, and lipohypertrophy risk.…

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GLP-1 Needle and Syringe Sizing Guide: Mounjaro, Ozempic, Wegovy and Compounded Vials

Glp 1

GLP-1 Needle and Syringe Sizing Guide: Mounjaro, Ozempic, Wegovy and Compounded Vials

Mounjaro, Wegovy and Ozempic needle and syringe sizes — practical UK guidance on gauge, length and travel kit options for GLP-1 self-injection.

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4 mm vs 5 mm vs 6 mm Pen Needles for GLP-1 Injections: What the Evidence Says

Glp 1

4 mm vs 5 mm vs 6 mm Pen Needles for GLP-1 Injections: What the Evidence Says

4 mm is the modern default for GLP-1 self-injection. 5 mm is fine. 6 mm and 8 mm are mostly leftover diabetes-era stock. Here's what the FITTER consensus and EMA…

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How to Inject Mounjaro: an 8-Step Protocol from the KwikPen Instructions

Mounjaro

How to Inject Mounjaro: an 8-Step Protocol from the KwikPen Instructions

Step-by-step Mounjaro KwikPen injection protocol from the Eli Lilly user manual, with the bits where first-time UK users actually get stuck.

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Mounjaro KwikPen Needles: a UK Buyer's Guide for 4 mm and 5 mm Pen Needles

Mounjaro

Mounjaro KwikPen Needles: a UK Buyer's Guide for 4 mm and 5 mm Pen Needles

What pen needles fit the Mounjaro KwikPen, what UK pharmacies actually charge, and what Lilly's instructions require. 4 mm × 31G or 32G is the modern default.

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Rotating Injection Sites for Weekly GLP-1 Medications: a 4-Week Pattern

Glp 1

Rotating Injection Sites for Weekly GLP-1 Medications: a 4-Week Pattern

Lipohypertrophy is rare on weekly GLP-1 injection but not zero. Here's a simple 4-week abdomen-and-thigh rotation pattern, with the FITTER guidance behind it.

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When you have read enough — sterile 31G packs ship from the EU.

If you decide 31G is the right gauge for your routine, our sister shop sends sterile, individually-blistered pen needles and syringes from Spain across the EU and UK. Free shipping over €50.

Shop 31G syringes at injectkit.com arrow_forward
Imogen Whitcombe — Editor

Imogen Whitcombe

Editor · 31-g.com

Who writes here

31-g.com is the content arm of InjectKit, an EU sterile-syringe supplier operated by meeco Servicios Globales S.L. (CIF B42774703, Alicante, Spain). Articles are written by people who handle these syringes daily — and reviewed against the manufacturer's IFU before publication.

If you spot something wrong in an article, email [email protected] and a human will read it. See our editorial policy for the full version.

place EU-based verified Sterile-syringe supplier edit_note Independent editorial link Sources in every article

Domande frequenti

Tutto quello che devi sapere prima di ordinare.

Il calibro 31G è adatto a me? expand_more

Il calibro 31 è l'ago di precisione più sottile disponibile in commercio — ideale per l'uso personale con minimo disagio. Se la tua prescrizione indica un altro calibro, segui il consiglio del medico. Per 29G o 30G, visita 29-g.com o 30-g.com.

Quando arriverà il mio ordine? expand_more

Gli ordini partono dalla Spagna e arrivano in 2-3 giorni lavorativi nella maggior parte dei paesi UE. Il numero di tracking arriva via email appena il pacco parte.

Come è etichettato il pacco? expand_more

Busta imbottita neutra. Il mittente appare come meeco SL senza nomi di prodotti, termini sanitari o marchi visibili all'esterno. Solo tu sai cosa c'è dentro.

Qual è la politica di reso? expand_more

Le confezioni non aperte e sigillate possono essere restituite entro 14 giorni dalla consegna per il rimborso totale. Per motivi igienici non accettiamo resi di confezioni aperte. Scrivi a [email protected] per iniziare un reso.

È un forniture? expand_more

Sì. Le nostre siringhe sono forniture certificati CE conformi al Regolamento UE sui Dispositivi Medici (MDR 2017/745). Sterilizzate con ossido di etilene e confezionate singolarmente. Ogni lotto è tracciabile fino allo stabilimento.

Spedite fuori dall'UE? expand_more

Sì. Spediamo in tutti i paesi UE più Svizzera, Norvegia e Regno Unito. I tempi di consegna fuori dall’UE possono essere leggermente più lunghi (3–7 giorni lavorativi) e potrebbero applicarsi dazi.