Study 03: what changed in belly fat?
Tesamorelin: How Much Deep Belly Fat Changed
The 52-week study and the 2026 review found less fat around the organs. Here is who was tested and what happened later.
How much deep belly fat did people lose?
The studies found less visceral fat, meaning the deep fat around the belly organs rather than beneath your skin. Too much deep fat is tied to poor blood sugar control and heart trouble, which is why researchers watched it.
In the main HIV studies, deep fat fell about 15% over six months. The drop stayed near 18% over a year.
A review of five studies also found less deep fat. Total body weight wasn't the main change.
Two limits matter when you read these results. The main tests involved people with HIV, and fat returned after treatment stopped.
How much visceral fat did each study find?
The 26-week study was large late-stage work, called Phase 3, with 412 people who had HIV [1]. People received 2 milligrams a day or a sugar pill; after the 52-week follow-up, the drug group still had 18% less deep fat [2].
In 2026, reviewers combined five fair tests [12]. Their 95% check allowed for chance, and the whole likely span still showed less deep fat.
The review also found less trunk fat and more weight from lean tissue. Those changes may not match what you would see in your body.
A 6-month study found 42 square centimeters less deep fat with tesamorelin [3]. That was an area on a flat scan image, not fat taken out of the body.
In 2024, another scan measure fell 25 square centimeters with the drug. The same measure rose 14 square centimeters with sugar pills [13].
These figures are group averages from study volunteers. They aren't a personal goal or a forecast for you.
Will tesamorelin help me lose belly fat?
Tesamorelin reduced deep fat around the belly organs in the people tested. The 26-week study gave adults with HIV 2 milligrams a day [1].
Deep fat fell with tesamorelin and rose with a sugar pill. Fat under the skin and total body weight didn't fall the same way.
Large studies haven't proved that result in people without HIV. For them, the FDA hasn't approved this use.
Does tesamorelin make the body use belly fat?
Tesamorelin raises 1 growth protein and the hormone that starts it. Both help the body use stored fat, chiefly fat deep around the belly organs.
One study found 42 square centimeters less deep fat on a scan [3]. Fat beneath the skin did not fall evenly across the body.
The people in these tests had HIV. The medicine may work more widely, but large fair tests haven't shown that.
When did belly-fat changes appear in the studies?
The main studies checked deep belly fat after 26 weeks. The drop lasted through 52 weeks while treatment continued [1][2].
In 2024, another study followed fat changes for 6 to 12 months [13]. Those time spans describe research in people with HIV, not a plan for you.
Does the belly fat come back after tesamorelin stops?
Yes, deep belly fat returned within weeks after people stopped tesamorelin. The lower fat level depended on treatment continuing.
The 52-week study watched what happened after the drug stopped [2]. A later review also found that fat fell through week 52, then came back [7].
What do studies say about tesamorelin without HIV?
The pivotal efficacy RCTs were all conducted in HIV-positive adults on antiretroviral therapy [1][2][3]. Non-HIV human data are limited to a mechanistic study in healthy men, where GH and IGF-1 rose and insulin sensitivity was preserved [4], plus a cognition trial in older adults. No large general-population fat-loss RCT has been completed, so any non-HIV use is off-label and investigational.
Off-label is not the same as outside medicine. Tesamorelin prescribing has begun at Promise Peptides (mypromise.com), where a licensed U.S. clinician decides each person's case and can turn a request down. The service considers U.S. patients only. Its treatment choices are shaped by the patient's state and the proposed medication. Unlike the approved medicine, a compounded preparation has no FDA approval. What a prescriber cannot supply is the missing evidence: supervision changes who is accountable for an off-label protocol, not what the trials have shown.
Why did researchers focus on deep belly fat?
Deep belly fat isn't just padding. It is linked to poor sugar control and heart trouble, so studies watched it closely [1].
A 12-month study also tied more deep fat to worse liver scars. Each extra 25 square centimeters on a scan raised those odds by 37% [9].
One review combined 10 fair tests with 1,511 people [8]. Hormone treatments reduced deep belly fat across those studies.
Weight from muscle and other lean tissue rose, while fat beneath the skin changed less [12]. Broad weight loss can take both fat and muscle.
The tesamorelin vs sermorelin page compares medicines that start the same hormone process. No direct study has shown that one works better.