Wegovy's Active Substance and How It Works
The core ingredient in Wegovy is semaglutide, a synthetic analogue of glucagon-like peptide-1 (GLP-1), a hormone the body produces naturally after eating. By activating GLP-1 receptors in the brain and digestive system, semaglutide is commonly reported to increase feelings of fullness and reduce appetite — an effect many people describe as quieting "food noise." It also slows gastric emptying, though this effect often lessens over time.
Semaglutide is the same active substance found in other semaglutide-based medicines, though Wegovy is specifically the formulation and brand licensed for weight management in adults. If you want to understand what Wegovy is and how it is used more broadly, that page covers the medicine in fuller context.
Inactive ingredients
In addition to semaglutide, Wegovy pens contain a number of excipients — inactive ingredients that help stabilise the solution. These typically include substances such as disodium phosphate dihydrate, propylene glycol, phenol, and water for injections. For the exact, up-to-date list of excipients, always check the patient information leaflet that came with your pen or the electronic Medicines Compendium (eMC), which holds the current approved product information.
How semaglutide compares to tirzepatide
Wegovy's semaglutide acts on one receptor pathway (GLP-1), while Mounjaro's active substance tirzepatide acts on two — GLP-1 and GIP. Both are once-weekly injectable medicines, but they are distinct compounds. For a broader look at what GLP-1 medicines are and how they work, that page provides a useful overview. The right medicine for any individual is a decision made by their prescriber — not something to determine by comparison alone.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
Tracking the right four numbers — weight, waist, protein and dose — turns a noisy chart into a clear story. That's the loop GLP-1 users keep coming back for.
AI Meal Tracking. Built for GLP 1 Appetites.
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Tracking Your Wegovy Journey with GLP Trackr
Understanding what is in Wegovy is a natural part of becoming informed about your treatment — and once you know, tracking how the medicine is affecting you day to day is where a companion app becomes genuinely useful.
GLP Trackr's side-effect tracking feature lets you log symptoms like nausea, fatigue, or digestive changes and view them as a timeline, so you can see whether patterns emerge alongside your dose stage. Many people find it helpful to bring this kind of logged record to their prescriber appointments rather than relying on memory.
The app also includes daily check-ins that capture mood, energy, food noise, and sleep alongside your weight — giving you a fuller picture of how semaglutide is fitting into your life, beyond the number on the scale. For a deeper look at how GLP-1 medicines work and what to expect, the guide to how GLP-1 medicines work is a useful companion read.
If you notice any side effect that is severe, persistent, or concerns you, contact your healthcare professional promptly — GLP Trackr helps you record what you experience so you can discuss it with them, but it is not a substitute for their clinical guidance. Any questions about the ingredients, excipients, or your suitability for Wegovy should go to your prescriber or doctor, who has access to your full medical history.
Want to log how you feel on each dose and spot patterns over time? GLP Trackr is free to try for 7 days — available now on the App Store and Google Play.
What does glptrackr include?
10+ powerful features. One app. Built specifically for Mounjaro and Wegovy users.
Everything your GLP-1 journey needs. Free to try for 7 days.
Morning Check-In
Start every day with a 60-second wellness check-in. Log how you're feeling, track nausea, appetite, energy, and mood — giving you and your care team a complete picture of how your medication is working.
Injection Tracking
Log every dose with a single tap. Track your dose history, phase in your cycle, estimated medication levels, and upcoming injection dates — with reminders so you never miss a scheduled shot.
Hydration Reminders
Staying hydrated is especially important on GLP-1 medications. Set daily water targets, log intake throughout the day, and receive smart nudges when you're falling behind your goal.
Smart Meal Planning
Personalized meal plans built around your current dose phase and side effects. Every meal is GLP-1 optimized — high in protein, gentle on the stomach, and scaled to your reduced appetite.
Recipe Library
Browse 50+ high-protein, GLP-1-friendly recipes filtered by meal type, prep time, and dietary needs. Every recipe includes full nutrition info, step-by-step instructions, and tips for eating with side effects.
Progress Analytics
Beautiful, easy-to-read charts show your weight loss trajectory, weekly nutrition trends, medication responses, and wellbeing scores over time — turning raw data into genuine insights.
AI Meal Scanning
Snap a photo of any meal and get a full nutrition breakdown in seconds — calories, protein, carbs, fat, and fibre. No searching. No manual logging. Just point, snap, and track.
Exercise & Steps
Log walks, workouts, and movement with activity targets that flex with your energy levels. On lower-energy dose days, gentler targets keep you moving without burning out.
Community Support
Connect with thousands of others navigating the same medication journey. Share milestones, ask questions, find accountability partners, and get support from people who truly understand.
Never Forget a Dose Again.
Log your Mounjaro or Wegovy injection in seconds. Track your pen, your dose level, and your injection site — so you always know exactly where you are in your treatment.
Watch Your Body Transform, Week by Week.
Log your weight, measurements, and how you're feeling after each dose. GLPTrackr turns your data into clear, motivating charts that show you how far you've really come.
You're Not on This Journey Alone.
Connect with thousands of real GLP-1 users sharing their wins, side effect tips, and meal ideas. Get the support of people who truly get it — because they're living it too.
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The Most Advanced GLP-1 Brain Ever Built.
The first AI built exclusively for GLP-1 weight loss. Every insight, every meal plan, every prediction trained on one thing only: helping you get the most out of your medication.
Knows Your Cycle
GLPIQ tracks where you are in your injection cycle and adjusts everything around it: lighter meals on nausea days, higher protein when appetite returns, and smarter targets as your medication level shifts.
Predicts Before You Feel It
GLPIQ learns your personal side effect patterns over time. After a few cycles, it starts warning you the morning before a rough day — and adjusts your meal plan automatically.
Finds Your Golden Dose
GLPIQ analyses every dose you've been on: weight loss rate, side effects, food noise, mood, protein adherence and tells you which dose gave you the best results. No other app does this.
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Frequently asked questions.
Wegovy contains semaglutide, a GLP-1 receptor agonist. It is a synthetic analogue of a naturally occurring hormone involved in appetite regulation, delivered as a once-weekly subcutaneous injection via a pre-filled pen.
The medication in Wegovy is semaglutide. It works by mimicking the GLP-1 hormone to increase feelings of fullness and reduce appetite. Wegovy is a prescription-only medicine; your prescriber or doctor determines whether it is suitable for you.
Yes, the active substance semaglutide is shared with other semaglutide-based medicines, though different formulations and brand names are licensed for different indications. Always check with your prescriber or the patient information leaflet for details specific to your medicine.
The complete list of active and inactive ingredients is in the patient information leaflet supplied with your pen, and in the approved product information on the electronic Medicines Compendium (eMC) at medicines.org.uk. Your prescriber or pharmacist can also answer questions about specific ingredients.
No. Wegovy contains semaglutide (a GLP-1 receptor agonist), while Mounjaro contains tirzepatide (a dual GLP-1 and GIP receptor agonist). They are distinct medicines. Which is appropriate for you is a decision for your prescriber or doctor, not a comparison to make alone.