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Tu guía sobre agujas para pluma y jeringas 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_userRevisado por un editor con formación clínica linkFuentes citadas en cada artículo placeCon sede en la UE · editorial independiente

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.

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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

Preguntas frecuentes

Todo lo que necesitas saber antes de pedir.

¿Es 31G el calibre adecuado para mí? expand_more

El calibre 31 es la aguja de uso estéril más fina disponible comercialmente — ideal para uso personal con mínimas molestias. Si tu prescripción indica otro calibre, sigue el consejo de tu médico. Para 29G o 30G, visita 29-g.com o 30-g.com.

¿Cuándo llegará mi pedido? expand_more

Los pedidos se envían desde España y llegan en 2-3 días laborables a la mayoría de países UE. El número de seguimiento llega por email en cuanto se envía el paquete.

¿Cómo está etiquetado el paquete? expand_more

Sobre acolchado neutro. El remitente aparece como meeco SL sin nombres de productos, términos sanitarios ni marcas visibles por fuera. Solo tú sabes qué contiene.

¿Cuál es la política de devoluciones? expand_more

Los paquetes sin abrir y precintados pueden devolverse en un plazo de 14 días desde la recepción para un reembolso total. Por motivos higiénicos no aceptamos devoluciones de paquetes abiertos. Escribe a [email protected] para iniciar una devolución.

¿Es un suministros? expand_more

Sí. Nuestras jeringas son suministros con marcado CE conformes con el Reglamento UE de Productos Sanitarios (MDR 2017/745). Están esterilizadas con óxido de etileno y envasadas individualmente. Cada lote es trazable hasta la fábrica.

¿Enviáis fuera de la UE? expand_more

Sí. Enviamos a todos los países miembros de la UE, Suiza, Noruega y el Reino Unido. Los plazos fuera de la UE pueden ser algo más largos (3–7 días laborables) y pueden aplicarse aranceles.