A study shot with no approval yet
Retatrutide: what Phase 2 found in people
Eli Lilly made retatrutide to curb hunger and help blood sugar. Early results led to larger studies, but retatrutide remains investigational and cannot be prescribed through telehealth.
Early retatrutide studies found large weight loss
Eli Lilly made retatrutide as a possible obesity drug. Phase 1, the first safety test, looked for early harm.
Phase 3 studies remained under way during 2026. A telehealth visit cannot provide a retatrutide prescription.
The FDA hasn't approved retatrutide. No regulator in another country has approved it either.
Retatrutide acts like three hormones used around meals. A 48-week Phase 2 study found the largest weight change.
People receiving the highest amount lost 24.2% of their weight [1]. That's close to one quarter of their starting weight.
The same loss isn't promised for you. The drug has a 6-day half-life [4].
Over that time, the amount in your blood falls by half. This slow fall supported weekly study shots.
Those study facts aren't home-use steps. People also had nausea and faster pulses.
Retatrutide effects gives you the counts and explains the risks.
Retatrutide affects hunger, insulin, and stored fat
Eli Lilly linked 39 amino acids, which are small protein pieces [3]. That chain can copy three hormones your body already makes.
One is GLP-1, a gut hormone that can ease hunger. It can also slow the emptying of your stomach.
Phase 1 checked early harm first. Phase 1 couldn't answer how much weight people might lose.
GIP comes from the gut and tells your pancreas to send insulin. Glucagon can make your body burn stored fat.
Retatrutide copies all three at once. A 2024 review found losses of 20–30% in study groups [13].
That's about one fifth to nearly one third. A 2025 review noted about 24% at 12 mg after 48 weeks [6].
Those are group averages, not a forecast for you. Some sites wrongly call retatrutide GLP-3.
That nickname points to 3 hormone jobs. It doesn't mean your body has a hormone named 3.
How does retatrutide work names each hormone and explains what it does.
Phase 2 retatrutide studies found three main changes
Weight changed most. One study followed 338 adults with obesity for 48 weeks [1]. At 12 mg, their average weight fell 24.2%.
Adults on the placebo lost 2.1%. Their injection contained no retatrutide. The 8 mg retatrutide group lost 17.3%.
Blood sugar also improved in Phase 2. A second study followed 281 adults with type 2 diabetes for 36 weeks [2].
Doctors call its main check the three-month blood-sugar test. At 12 mg, the result fell 2.02 points by week 24.
Lower is better, but your doctor sets a goal for you. The placebo group's result fell 0.01 point at week 24.
Body weight in the retatrutide group fell 16.94% by week 36. Your own test might not change that way.
Liver fat fell in the third Phase 2 study. It followed 98 people with obesity or extra weight [5]. All had fatty liver.
At 12 mg, liver fat fell 82.4% by week 24. A scan found that 86% got below 5%, which the study called normal.
Staff put people into groups by chance. Neither the people nor the staff knew which shot each person got.
The FDA hasn't approved retatrutide
Retatrutide remains investigational, without FDA approval. The drug remained in Phase 3, the last large study stage.
One Phase 3 study covers obesity with type 2 diabetes [8]. The type 2 diabetes work also tracks weight [9].
Another Phase 3 study covers obesity and heart disease. A third watches the heart and kidneys [10].
A fourth compares retatrutide with tirzepatide [11]. Access to retatrutide as a medicine is restricted to authorized clinical trials.
Eli Lilly must ask the FDA to review the drug. The FDA will then weigh benefits against harm.
That answer isn't known yet. Until approval, no doctor can prescribe retatrutide for you.
Online retatrutide vials may be false or dirty
No approved retatrutide medicine is on sale. An online research vial may not match its label.
You can't check the vial's strength or cleanliness. Germs injected under your skin can cause a grave infection.
In 2025, more than 50 FDA warning letters went to sellers. Those sellers had broken federal drug law.
The word "telehealth" in this address doesn't mean there's a clinic here. No doctor, pharmacy, or seller runs the site.
You can't book a visit or get a prescription here. The pages tell you what human studies found.
An online label can't prove what's in a vial. Your health bears the risk when the label is false.