Semaglutide copies GLP-1, a gut hormone, and may change hunger, weight, blood sugar, and liver health.
Learn what happened in studies, which problems may occur, and what to ask at your next visit.
What Semaglutide may change in your health
GLP-1 is the gut hormone that semaglutide copies. This page covers possible benefits, common trouble, and questions for your next visit. Doctors use the medicine for type 2 diabetes, weight care, and some heart risks. Since 2025, it’s also been used for MASH, a serious liver illness.
In the leading weight trial, people lost about 15% on average over roughly a year [1]. A liver trial found that swelling cleared more often with semaglutide than with a placebo shot [8]. People who’ve taken the medicine also say thoughts about food became quieter. Those accounts aren’t proof from a study that compared groups.
Nausea and other stomach trouble are common. Weight often comes back after the medicine ends. I’d ask, "Which benefit matters most for me, and which risk concerns you?" The effects page can help you get ready for that talk.
What Semaglutide did for scarred livers
The clearest liver result for semaglutide came in 2025 during phase 3, the last large test before wider use. It included 1,197 adults with MASH and liver scars beyond the early stage. Doctors confirmed the illness by checking a tiny piece of each person’s liver. One group received 2.4 mg each week, while the other received a placebo [8].
Liver swelling cleared without worse scars in 62.9% of those given semaglutide. That’s what happened in 34.3% of those given placebo [8]. The scars themselves eased in 36.8% versus 22.4%. People couldn’t feel the healing; doctors found it in the liver samples.
This result can’t predict your own liver change. You’ll find other studies of blood sugar, weight, the heart, and the kidneys. At your visit, ask, "Does my liver illness match the kind studied here?"
What Semaglutide did for weight, heart, and kidneys
STEP 1 found the largest change in weight. Adults with extra weight but no diabetes received 2.4 mg by weekly shot. At week 68, average weight fell -14.9%, compared with -2.4% on placebo [1]. Tests in rats and mice also found less activity in brain areas that drive hunger [4].
Heart studies found benefits as well. SELECT followed 17,604 adults with heart disease and extra weight, but no diabetes. Serious heart trouble was 20% less common with semaglutide than with placebo [3]. SUSTAIN-6 found fewer heart problems in people with type 2 diabetes, but quick blood-sugar drops came with more eye trouble [2].
A kidney study followed people whose type 2 diabetes had damaged their kidneys. Severe kidney trouble or death was 24% less common with semaglutide [6]. Each heart result had a 95% range because its exact size is unsure; the kidney result had a 95% range too, and the other heart result had its own 95% range. Your own health may change the balance, so read the full results on Semaglutide research.
What lets Semaglutide stay for about a week
Your natural GLP-1 disappears within about two minutes. Semaglutide stays in your blood for roughly a week. The medicine’s design stops your body from breaking it apart quickly [9]. Its fat-like tail clings to a common blood protein, slowing removal by the kidneys.
Doctors call that week the half-life, meaning half has left your blood. About five weeks after the last dose, very little remains [9]. DPP-4 is an enzyme, or protein-cutting tool, that normally breaks down the gut hormone. That’s why the shot is weekly while the pill is daily.
Read what is semaglutide to see how the medicine was changed. Then how does semaglutide work explains what happens inside your body. Both pages can help you ask how long an effect or side effect may last.
What you’ll still need to ask a clinician
This site isn’t a clinic or a pharmacy. It explains study findings and warnings from the medicine label. The site can’t choose an amount or tell you what to take. A displayed amount belongs to a study; it isn’t advice for you.
Read Semaglutide research for study results and Semaglutide effects for benefits and harm. You’ll find the tested amounts on the dosage page. The source number printed with a claim leads to Semaglutide references. Bring the page or your question when you see your doctor.