Loose Skin on GLP-1 Medications
Many people notice loose skin after losing weight on Ozempic, Wegovy, Mounjaro, or Zepbound. Here is why it happens and what actually helps.
Written by Amy Shommer, based on published research. Last updated August 16, 2026.
Why loose skin happens on GLP-1 medications
If you have lost a good amount of weight on Ozempic, Wegovy, Mounjaro, or Zepbound and you are looking at loose skin in the mirror, you have not done anything wrong. This happens to a lot of people, and there is a plain reason for it.
Skin is a living, stretchy layer, not a rubber band. When you lose weight fast, it does not always spring back at the same pace your body is losing fat. That gap between the two is where loose skin comes from. A study of skin tissue after major weight loss found fewer of the thick, well organized collagen fibers that give skin its structure, and more thin, loosely packed ones that do not hold shape nearly as well.
Why it happens
- Losing the weight fast. The quicker the weight comes off, the less time your skin has to adjust. Slower, steadier loss tends to leave skin looking tighter, even when the total amount lost is the same.
- Losing collagen along with the weight. Fast weight loss changes the structure of your skin itself, not just what is underneath it. The fibers that used to hold it firm get replaced with weaker ones that do not spring back the same way.
- Losing muscle along with fat. Muscle sits right underneath your skin and gives it something to rest on. Lose muscle along with fat and skin has less underneath it to hold its shape against.
- Getting older. Skin naturally makes less collagen as the years go by. The same amount of weight loss can look different on you at fifty than it would have at twenty five.
What helps
- Keep up your resistance training. Building and keeping muscle gives your skin some support to lie against. It will not replace collagen you have lost, but it makes a real difference in how loose skin looks and feels.
- Eat enough protein. Protein is what your body uses to keep the muscle you have and to build new collagen. Coming up short on protein works against you twice over.
- Drink enough water. Skin that is well hydrated tends to hold up better than skin that is dry. It is a small thing, but it adds up over months.
- Go slower if you have the choice. If your prescriber gives you room to lose weight at a steadier pace, it tends to be easier on your skin than a fast drop.
For more on why muscle matters through all of this, see our guide on the science of muscle loss on GLP-1 medications.
Being honest about what to expect
After a large amount of weight loss, some looseness may stick around no matter what you do. That is not a failure on your part. It is simply what skin does after it has been stretched for a long time. Some people choose to talk to a doctor about surgical options once their weight has been stable for a while. That is a personal decision, not a requirement.
When to call your doctor
Bring up loose skin at your next appointment if it is bothering you, especially if it is causing rashes or irritation in skin folds. There are real options, from resistance training to surgery, and your doctor can help you sort out what is worth considering for your situation.
See how your habits affect your muscle
Our calculator turns your protein intake and training frequency into a Muscle Preservation Score, with one clear thing to work on next.
Try the Muscle Loss Calculator