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menu_book Pôle d'information 31-G

Votre guide des aiguilles stylo et seringues 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.

verified_userRelu par un rédacteur formé en clinique linkSources citées dans chaque article placeBasé en UE · rédaction indépendante

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

Questions fréquentes

Tout ce qu'il faut savoir avant de commander.

Le calibre 31G est-il fait pour moi ? expand_more

Le calibre 31 est l'aiguille stériles la plus fine disponible — idéale pour l'usage personnel avec un minimum d'inconfort. Si votre ordonnance spécifie un autre calibre, suivez l'avis de votre médecin. Pour 29G ou 30G, visitez 29-g.com ou 30-g.com.

Quand ma commande arrivera-t-elle ? expand_more

Les commandes partent d’Espagne et arrivent en 2-3 jours ouvrés dans la plupart des pays UE. Le numéro de suivi arrive par email dès expédition.

Comment le colis est-il étiqueté ? expand_more

Enveloppe matelassée neutre. L'expéditeur apparaît comme meeco SL, sans nom de produit, terme médical ou marque visible à l'extérieur. Seul vous savez ce qu'il y a dedans.

Quelle est votre politique de retour ? expand_more

Les emballages non ouverts et scellés peuvent être retournés dans les 14 jours suivant la réception pour remboursement intégral. Pour des raisons d'hygiène, nous n'acceptons pas les retours d'emballages ouverts. Écrivez à [email protected] pour initier un retour.

Est-ce un dispositif médical ? expand_more

Oui. Nos seringues sont des fournitures certifiés CE, conformes au Règlement UE sur les Dispositifs Médicaux (RDM 2017/745). Stérilisées à l'oxyde d'éthylène et emballées individuellement. Chaque lot est traçable jusqu'au site de fabrication.

Livrez-vous en dehors de l'UE ? expand_more

Oui. Nous livrons dans tous les pays membres de l’UE, en Suisse, en Norvège et au Royaume-Uni. Les délais hors UE peuvent être un peu plus longs (3–7 jours ouvrables) et des droits de douane peuvent s’appliquer.