What are GLP-1 injections and how do they work?

GLP-1 injections are prescription medicines that mimic a natural hormone called glucagon-like peptide-1. They work by reducing hunger signals in the brain, slowing stomach emptying so you feel fuller for longer, helping control blood sugar levels, and reducing food cravings. Popular options include Wegovy, Ozempic, and Mounjaro.

How much weight can you lose on GLP-1 injections?

Clinical trial results show average body weight loss of around 15% with Wegovy (semaglutide 2.4mg) and 15-22% with Mounjaro (tirzepatide). Results vary based on medication, dose, lifestyle habits and individual medical history. Best results come when medication is combined with protein-focused nutrition, regular activity, good sleep, and ongoing support.

What are the side effects of GLP-1 injections?

The most common side effects are digestive and often improve over time. These include nausea, constipation, diarrhoea, bloating, reduced appetite, reflux, and fatigue. Less common but more serious side effects can include gallstones, pancreatitis, or dehydration. Side effects can be reduced by eating smaller meals, avoiding greasy foods, staying hydrated, and increasing doses slowly under medical supervision.

Do you regain weight after stopping GLP-1 injections?

Weight regain can happen after stopping GLP-1 medication, especially if the underlying drivers of weight gain remain. Long-term success depends on building sustainable habits during treatment including nutrition routines, muscle-preserving exercise, sleep optimisation, and ongoing medical review. Some people remain weight-stable after stopping; others benefit from longer-term treatment.

Who is eligible for GLP-1 weight loss injections in the UK?

In the UK, GLP-1 medications may be prescribed privately for adults with a BMI over 30, or a BMI over 27 with weight-related conditions such as type 2 diabetes, sleep apnoea, or hypertension. NHS eligibility has additional criteria including Tier 3 weight management programme attendance. Eligibility also depends on medical history. Speak to TribElle to check your eligibility.

TribElle featured image with text ‘Sun, sand… and GLP-1 answers?’ showing a GLP-1 injection pen, a cartoon pineapple with sunglasses, and a beach scene background

GLP1s

GLP-1 Injections for Weight Loss: UK Guide to Wegovy & Mounjaro

TribeTeam

August 3, 2025

Jump to What are GLP-1 injections? Are they safe? Who qualifies in the UK? Mounjaro vs Wegovy

Let's be real: if you've found yourself searching "why can't I lose weight?", "Why do I regain weight so easily?" or "Why is weight loss harder in my 40s?" You're not alone.

Weight loss is rarely just about willpower. It is influenced by biology, hormones, appetite regulation, stress, sleep, medications, menopause, and the environment we live in. Yet so many people still carry the shame of struggling, as though it is a personal failure.

You may also be asking, 'Where can I find information on GLP1s?', Which online GLP1 provider can I trust?' or 'Where can I speak to a clinician if I'm worried about using GLP1s?'

At TribElle, we will provide answers to all those questions.

Weight management is a health issue, and for many people it requires more than generic advice to "eat less and move more." We now have evidence-based medical options that can support people in a meaningful way, including GLP-1 medications such as Wegovy, Ozempic and Mounjaro.

Whether you've just heard about these 'skinny jabs' on TikTok or you've been researching them for months, this guide is for you.

What are GLP-1 injections?

GLP-1s (short for glucagon-like peptide-1 receptor agonists) are medications that mimic a natural hormone your gut releases after you eat. That hormone does three major things:

→	Tells your brain you're full

→	Slows how quickly food leaves your stomach

→	Helps your body regulate blood sugar

Put simply: you feel satisfied faster, stay full longer, and crave less. The result? You naturally eat less — without feeling like you're starving.

Wegovy, Ozempic, Mounjaro — what's the difference?

Medication	What it is	Approved use	Weight loss potential
Ozempic	Semaglutide	Type 2 diabetes	Off-label only (not for weight loss in UK)
Wegovy	Semaglutide	Weight loss	✅ 15%
Mounjaro	Tirzepatide	Type 2 diabetes (UK); weight loss (US)	✅ 21%

Mounjaro is slightly different — it acts on two hormones (GLP-1 and GIP) and has shown even greater results in trials than semaglutide.

How much weight could I lose?

15%Gradual, consistent weight lossSTEP 1 Trial — Wegovy (2.4mg), 16 months

21%Gradual, consistent weight lossSURMOUNT-1 Trial — Mounjaro (15mg)

Studies have shown that significant weight loss is possible. These aren't crash diets. They're medications that quiet the food noise, so you can finally focus on living your life. The research is clear: real, significant, sustained weight loss.

What are the side effects of using weight loss injections?

THE GOOD

✓	Less obsession around food

✓	Feeling full quicker

✓	Easier to say no to snacks and sugar

✓	Gradual, consistent weight loss

✓	Better blood sugar and blood pressure

THE CHALLENGING

!	Nausea (especially when increasing dose)

!	Digestive issues like bloating or diarrhoea

!	Low appetite that might feel too strong at times

!	Occasional headaches or fatigue

Side effects are usually mild and temporary. Your body adjusts with time, and most people feel fine within a week or two. Starting on a low dose and increasing slowly really helps.

Is this safe?

GLP-1s have been used in diabetes care for over 15 years. Semaglutide and Tirzepatide are both approved by MHRA, NICE, EMA, and FDA.

WHO SHOULD NOT USE GLP-1s

⚠	Type 1 diabetes

⚠	Active gallbladder or pancreas issues

⚠	A personal or family history of MEN2 or medullary thyroid cancer

⚠	Pregnancy or breastfeeding

That's why a prescription and medical review are essential. (P.S. We do all that at TribElle 🧡)

Who qualifies for weight loss injections in the UK?

NHS ELIGIBILITY

✅	BMI requirements vary by location + related health conditions

✅	Must attend a Tier 3 weight management programme

✅	South Asian & Black communities may qualify with lower BMI

PRIVATE ELIGIBILITY

✅	BMI over 30

✅	Or BMI over 27 with weight-related issues

✅	Wider access to Wegovy and Mounjaro

✅	Available via trusted online clinics and pharmacies (like us!)

How long will I be on it?

GLP-1s are not a forever medication for most people, but they are long-term. Think of it like blood pressure medication — even when things improve, you may still need ongoing support. You may just want to use it for a few months to start your weight loss journey, feel more energetic and motivated to get to the gym, go on that run or feel like your old self again!

→	Taper down after reaching your goal

→	Switch to a maintenance dose

→	Stop completely (if lifestyle habits are strong and sustainable)

What else should I do while on it?

GLP-1s open the door — but you still have to walk through it. You'll get the best results when you combine your injection with:

🌱	High-protein dietNourish your body as it changes

🧘🏽‍♀️

Moderate activityWalking, yoga, resistance training

🧠	SupportCoach, community, or clinician

😴	Rest & recoveryYour body is doing important work

Frequently asked questions

You're not lazy. You're not broken.

Obesity is not a personal failing — it's a chronic health condition. And now, for the first time in history, we have medications that really work.

✨ You deserve access to the best evidence-based care.
✨ You deserve to feel good in your body.
✨ You deserve support that's kind, not judgmental.

That's what we're here for at TribElle.

Supporting your body during weight loss treatment can make all the difference. From vitamins to collagen support, we've got you covered.