Injection site rotation: where to inject next, and how to keep track

The Wegovy, Ozempic, Mounjaro and Zepbound labels all list the same three regions for a subcutaneous shot: abdomen, thigh and upper arm, and all say to rotate. Rotation means not landing in the same spot twice in a row. The simplest system is a fixed order across sites, and a log of which one you used last, which is what Peppy's body map does.

What the labels say about injection site rotation

You do not have to guess where a GLP-1 shot is allowed to go. Each label lists it in the dosing section, and the wording is nearly identical across brands:

• Wegovy: "Inject subcutaneously in the abdomen, thigh, or upper arm. The time of day and the injection site can be changed without dose adjustment."
• Ozempic: same three regions, plus "use a different injection site each week when injecting in the same body region."
• Mounjaro and Zepbound: "abdomen, thigh, or another person should inject in the back of the upper arm. Rotate injection sites with each dose."
• Saxenda: same three regions; "rotate injection sites within the same region in order to reduce the risk of cutaneous amyloidosis."

Research peptides such as BPC-157 or compounded Compounded Semaglutide in a vial have no label to quote, but they are also subcutaneous shots, and the people who use them tend to borrow the same three regions and the same rotation habit.

Why rotate at all

The clearest evidence comes from insulin, where people have been giving themselves daily subcutaneous shots for decades. The 2016 injection-technique recommendations published in Mayo Clinic Proceedings report that roughly a third of insulin users have lipohypertrophy, thickened or lumpy fat tissue at the injection site, and tie it to incorrect site rotation. Injecting into those areas makes absorption blunted and variable. The recommendations' fix is simple: rotate correctly, keep a finger-width between recent shots, and never inject into a lump, a bruise or scar tissue.

Weekly GLP-1 shots are less frequent than insulin, but the same tissue is involved, and most people on them stay on them for months. Many people also report that a spot that gets hit repeatedly is the one that bruises or stays sore. Rotation is a cheap habit that removes the problem before it starts. If you do see a persistent lump or an injection site reaction, that is a conversation for your prescriber.

A rotation system that survives real life

The labels tell you to rotate. They do not tell you how, and "somewhere different" falls apart by week six when you cannot remember whether last time was left or right. What works is a fixed order that you never have to think about, and a record of where you were in it.

A common pattern is to split each region into left and right and cycle through them, for example: lower-left abdomen, lower-right abdomen, left thigh, right thigh, back to the abdomen. A weekly shot then takes a month to return to the same site. Daily peptide shots move through the order faster, which is where the record matters more than the order.

Peppy tracks 13 sites, listed below. The abdomen is split into four quadrants because it is the region most people use and the one that needs the most spacing.

Rotating across more than one compound

If you take a weekly GLP-1 and a daily peptide, or run a stack of several peptides, rotation per protocol is not enough. Two protocols each on their own rotation can still land on the same thigh on the same morning. The rotation has to be shared: one order, one "last used" record, across everything you inject. That is a spreadsheet headache and one of the main reasons people move to an app (see spreadsheet vs app).

How to do this in Peppy

Site rotation is free in Peppy and works for every protocol, from a weekly Zepbound pen to a twice-daily peptide.

1. When a shot is due, open the Today tab and tap the protocol's Log button. The Log shot sheet opens with a front-and-back body silhouette.
2. Peppy marks the site it suggests next and shows when each site was last used, for example "Left thigh · last used 6 days ago". The suggestion follows your rotation order and is shared across all of your protocols, so two compounds never collide on one site.
3. Tap the site you actually used. You can pick a different one from the suggestion; Peppy just records what happened. Adjust the time or dose if needed, add a note ("stung a bit"), then tap Log shot.
4. To see where you have been, open a protocol from Protocols and look at the Rotation section. Free shows the order and last-used dates. Pro lets you set a custom site order (drop the arms if nobody is around to help, for instance) and shows a heat-map of how often each site has been used.
5. Made a mistake? Open the shot in Calendar, tap it and edit the site. Past logs are editable, and the next suggestion updates.

Pair rotation with a shot-day reminder (Pro) and the notification itself tells you the site and the units before you open the app.

Track it in Peppy

123 compounds built in, the units math done for you, body-map site rotation and reminders — private on your iPhone.

Free · iPhone · no account

Frequently asked

Not medical advice. Peppy is a tracking tool, not medical advice. Dose calculations are mathematical conversions only. Always follow your prescriber's instructions and verify every draw-up yourself.