Injection Sites for Weekly Weight Loss Jabs: The Basics
Both Mounjaro and Wegovy are once-weekly subcutaneous injections — meaning they go into the fatty tissue just beneath the skin, not into muscle. The three commonly used sites are:
- Abdomen — a few centimetres away from the navel, anywhere around the mid-section
- Front of the thigh — the outer, fleshy part of the upper leg
- Upper outer arm — often easier with help, though some people manage it solo
Rotating between these sites — and varying the exact spot within each area — helps prevent lumps, skin changes, or discomfort that can develop if the same patch of skin is used repeatedly. Your prescriber or doctor can advise which sites suit you best given your individual circumstances; the information here is general and not a substitute for their guidance.
If you notice persistent redness, swelling, or unusual skin changes at an injection site, mention it to your healthcare professional promptly rather than waiting for your next scheduled appointment.
For a broader overview of how these medicines are administered, visit our guide to weight loss injections. You may also find it helpful to read about Mounjaro as a weight loss jab if tirzepatide is what you have been prescribed.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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How GLP Trackr Helps You Stay on Top of Your Jabs
Keeping a mental note of which site you used last week is easy to forget — especially once a weekly injection becomes routine. GLP Trackr's injection-site tracking lets you log each jab (body area, specific spot, date, and dose strength), and the app uses that history to suggest your next rotation site automatically. There is no guesswork, and no trying to remember whether you used your left or right side last time.
Alongside site tracking, the dose-reminder feature means your weekly schedule stays consistent — a gentle nudge so a jab is never accidentally skipped or delayed. Every dose you log builds a clear record you can glance back through, or bring to a prescriber appointment as part of your injection history.
If you ever have questions about injection technique or which site to use in a particular situation, always follow the advice of your prescriber or doctor — they know your full history and the specifics of your prescription.
To read more about finding the right pharmacy or access route for your weight loss jabs, see our page on weight loss jabs and pharmacy access. For a general overview of everything covered in this content family, the weight loss injections hub is a good starting point.
Ready to take the guesswork out of injection rotation? GLP Trackr logs every site, tracks your rotation history, and reminds you when your next jab is due. It is free to try for 7 days — available now on the App Store and Google Play.
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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.
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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.
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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.
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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.
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Frequently asked questions.
Weight loss jabs like Mounjaro and Wegovy are typically injected into the abdomen, front of the thigh, or upper outer arm. These are subcutaneous injections into the fatty tissue beneath the skin. Your prescriber or doctor can advise on the best site for you personally.
Yes, rotating injection sites each week — and varying the exact spot within each area — is widely recommended. Using the same patch of skin repeatedly can lead to discomfort or skin changes over time. Rotating helps maintain healthy skin and consistent absorption.
There is no single best site that suits everyone. The abdomen, thigh, and upper arm are all commonly used. Your prescriber or doctor is best placed to advise which site works for your circumstances, based on your individual health history and the specific medicine you have been prescribed.
GLP Trackr lets you log each injection's site, date, and dose. The app tracks your rotation history and suggests the next site automatically, so you never have to remember where you last injected. It also sends dose reminders to keep your weekly schedule on track.
If you notice persistent redness, swelling, lumps, or unusual skin changes at a jab site, contact your healthcare professional promptly. Minor short-lived soreness is commonly reported, but anything persistent or worsening should be assessed by a clinician rather than managed at home.