What makes GLP-1 weight loss injections effective?
GLP-1 receptor agonists like semaglutide (Wegovy) and tirzepatide (Mounjaro) work by acting on hormone pathways that regulate appetite and feelings of fullness. Many people using these medicines report a significant reduction in food noise — the constant background pull toward eating — as well as a greater sense of satiety after smaller amounts of food. Tirzepatide also acts on the GIP receptor, making it a dual agonist, which is one distinguishing feature compared to semaglutide.
These medicines are typically started at a low dose and adjusted gradually, under prescriber supervision, over a period of weeks or months. This titration approach is designed to help the body adapt and to manage commonly reported side effects such as nausea, particularly early on.
Key facts about the main options
- Mounjaro (tirzepatide): A dual GIP and GLP-1 receptor agonist, supplied as a pre-filled weekly injection pen. Available in several dose strengths, adjusted by a prescriber over time.
- Wegovy (semaglutide): A GLP-1 receptor agonist, also given as a once-weekly injection in a pre-filled pen, with dose strengths that are titrated under prescriber guidance.
- Both are prescription-only medicines — they cannot be obtained without a valid prescription from a qualified healthcare professional.
It is worth noting that no injection is effective in isolation. Both medicines are intended to be used alongside dietary changes and increased physical activity, as directed by a prescriber. Results vary considerably between individuals and are not guaranteed.
For a broader look at how these medicines are used and what people commonly experience, see our guide to weight loss injections. You may also find it helpful to read about what makes a weight loss injection successful in practice, or to explore the most popular weight loss injections and how they compare.
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.
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How GLP Trackr supports your injection journey
Staying consistent with a weekly injection schedule matters — but it is easy to lose track of which site you injected last week, or whether your next dose falls on a Thursday or a Friday. GLP Trackr is built specifically for people already on Mounjaro or Wegovy, and injection tracking sits at the heart of the app.
The injection-site rotation feature lets you log each injection — the site (abdomen, thigh, or upper arm), the date, and the dose strength — and the app uses that history to suggest your next rotation site automatically. Rotating sites is generally recommended to reduce the risk of local skin reactions, and having a clear log removes the guesswork entirely.
Alongside site tracking, dose reminders mean a weekly injection is far less likely to be forgotten, and your full dose history is always available to review or share at a prescriber appointment. If you want to understand more about how the app helps beyond injection tracking, the weight loss injection overview goes into more detail.
GLP Trackr is available free to download on the App Store and Google Play, with a 7-day free trial. Log your first injection today and let the app handle your rotation schedule from there.
Always follow the specific guidance your prescriber or doctor has given you about your injection schedule and technique — they know your full history. If you experience any injection-site reactions or symptoms that concern you, contact your healthcare professional promptly rather than relying on general guidance.
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.
The most widely prescribed weight loss injections are tirzepatide (Mounjaro) and semaglutide (Wegovy), both prescription-only, once-weekly medicines. They work on appetite-regulating hormone pathways. Which is appropriate for a specific individual is a decision for a qualified prescriber or doctor.
Both tirzepatide (Mounjaro) and semaglutide (Wegovy) are used for weight management, but comparing their effectiveness for any one person is a clinical question. Individual results vary, and the right choice depends on a person's medical history — always discuss this with your prescriber or doctor.
Rotating injection sites is generally recommended to reduce the chance of local skin reactions at the injection site. Common sites include the abdomen, thigh, and upper arm. Your prescriber or the patient information leaflet with your medicine will provide specific guidance for your situation.
GLP Trackr is built specifically for people already prescribed Mounjaro or Wegovy. It logs doses, injection sites and rotation, tracks side effects, food, weight, and progress — all in one place. It is available free on the App Store and Google Play with a 7-day trial.
No. Mounjaro (tirzepatide) and Wegovy (semaglutide) are prescription-only medicines. They must be obtained via a qualified prescriber and a registered pharmacy in your country. GLP Trackr does not sell, supply, or help source medication of any kind.