Mounjaro and Wegovy: What the Evidence Says (Factually)
Both medicines work on appetite-regulating pathways in the body, helping many people experience a reduced sense of hunger — commonly described as lower "food noise" — alongside a feeling of fullness after smaller amounts of food.
Wegovy (semaglutide)
Wegovy contains semaglutide, a GLP-1 receptor agonist. It is injected once a week using a pre-filled pen and is started at a low dose, with the prescriber adjusting upward over time. Dose strengths commonly referenced include 0.25 mg, 0.5 mg, 1 mg, 1.7 mg, and 2.4 mg. Like all prescription medicines, it carries a black triangle (▼) designation in some markets, meaning any side effects should be reported to your national reporting scheme (such as the UK's Yellow Card scheme) and to your healthcare professional.
Mounjaro (tirzepatide)
Mounjaro contains tirzepatide, a dual GIP and GLP-1 receptor agonist — it acts on two appetite-related pathways rather than one. It is also a once-weekly injection, available in pre-filled pens, with dose strengths commonly referenced at 2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, and 15 mg. As with Wegovy, titration is managed by the prescriber, and it also carries a ▼ designation in some markets.
So which is "best"?
No independent source — including this one — can determine which injection is better for you personally. Suitability depends on your medical history, other medicines you take, and your prescriber's clinical judgement. If you are researching this topic, the most useful next step is a conversation with your prescriber or doctor. You can explore a more detailed side-by-side breakdown on our weight loss injections overview, or read further comparisons in our guides to what makes a weight loss injection right for you and the most-discussed weight loss injections.
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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Once You Are Prescribed: Tracking Your Injections with GLP Trackr
Whichever injection your prescriber has chosen for you, staying consistent with a weekly schedule — and rotating your injection sites correctly — makes a real practical difference to your experience.
GLP Trackr's injection-site tracking and rotation feature is built specifically for this. Each time you inject, you log the site (abdomen, thigh, or upper arm), and the app tracks your rotation history and suggests where to inject next. Over weeks, this removes the mental load of remembering which site you used last — particularly useful during a busy week when it is easy to lose track.
Alongside site rotation, the app's dose logging keeps a clear record of every injection: the date, time, and dose strength. That record becomes genuinely useful at prescriber appointments, where you can show exactly what you have taken and when — rather than trying to recall it from memory. You can also generate a summary report directly from your logged data to bring to your next appointment.
If you want to understand how other GLP-1 users track their injection journeys, see our guide on choosing and tracking your weight loss injection.
A note on safety: any questions about which injection is right for you, whether to switch, or how to manage your dose should always go to your prescriber or doctor — they know your full health history and are the only ones qualified to advise on that decision. GLP Trackr helps you record your journey; it is not a substitute for clinical guidance.
Ready to take the guesswork out of injection tracking? Download GLP Trackr on the App Store or Google Play — your first 7 days are completely free.
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.
Neither can be declared universally "best" — both are prescription-only GLP-1 medicines with different active ingredients, and suitability is an individual clinical decision. Your prescriber or doctor is the right person to advise which is appropriate for your health history and circumstances.
Wegovy contains semaglutide, a GLP-1 receptor agonist. Mounjaro contains tirzepatide, which acts on both GLP-1 and GIP pathways. Both are once-weekly injections started at a low dose and adjusted by a prescriber. Neither is inherently superior — suitability depends on individual clinical factors.
Safety is individual and depends on a person's full medical history, other medicines, and clinical circumstances. Both Mounjaro and Wegovy carry known side effect profiles documented in their official product information. Your prescriber or doctor is best placed to assess which is safe and appropriate for you.
GLP Trackr is a free-to-try companion app built specifically for people on Mounjaro or Wegovy. It logs injection sites, tracks rotation, records dose history, and monitors weight and side effects. A 7-day free trial is available on the App Store and Google Play.
GLP Trackr lets you log each injection — recording the site (abdomen, thigh, or upper arm) — and tracks your rotation history automatically, suggesting where to inject next. This helps ensure you are not repeatedly injecting the same area, which is a common recommendation from prescribers.