Retatrutide: What Amounts and Shots the Studies Used
These figures come from supervised research, not a plan for your use. No retatrutide dose, mixing step, or storage rule has approval.
What amounts the retatrutide studies used
What amount of retatrutide can a doctor prescribe for you? None, because the drug has only been used in supervised human studies.
The figures here tell you what researchers gave people. They aren't directions for mixing a vial or choosing your own amount.
Retatrutide has no approved form, prescription dose, or mixing steps. In Phase 2, a mid-stage obesity study used weekly shots of 1, 4, 8, or 12 mg for 48 weeks.
Phase 1b, an early test in a small group, began at 0.5 mg and rose to 12 mg. Its half-life, the time for half to leave the blood, was about 6 days.
Because retatrutide lingered, one study shot could cover a week. That fact doesn't show which amount your body could bear safely.
What retatrutide dosage Phase 1b tested and why it isn't your dose
In 2022, this later part of the first testing stage followed 72 adults for 12 weeks [4]. All had type 2 diabetes, and each weekly shot entered fat beneath the skin.
- 0.5 mg once weekly, with no change
- 1.5 mg once weekly, with no change
- 3 mg once weekly, with no change
- 3 mg, then 6 mg
- 3 mg, then 6 mg, then 9 mg, then 12 mg
Study staff gave all these shots once a week. Raising the amount showed what those people could bear, not what you could.
After 12 weeks, the extra loss in the 3/6/9/12 mg group versus placebo was −8.96 kg [4]. Placebo means the comparison shot without retatrutide.
At the 3 mg level, average daily blood sugar fell [4]. That finding isn't a set of personal instructions.
What retatrutide dosage Phase 2 tested and what you must not copy
Phase 2 obesity study in 2023: People received 1, 4, 8, or 12 mg in a weekly under-skin shot for 48 weeks. Each person stayed at one set amount [1].
Phase 2 type 2 diabetes study in 2023: People started at 0.5 mg. Staff increased it step by step until it reached 12 mg during the 36-week study [2].
The study teams chose and changed every amount. Nausea, vomiting, and diarrhea showed up more as amounts rose, and these problems drove many people to stop [1][2].
Those study steps aren't a guide for your use. They show why trained staff watched each person and why you can't safely copy the plan.
What the retatrutide half-life means in your body after a shot
Phase 1b put the half-life at about 6 days [4]. In plain words, half the amount leaves your bloodstream during that time.
A fat-like tail helps retatrutide hook onto albumin, a protein that carries things through your blood. The attachment makes your body clear the medicine more slowly.
The long half-life led researchers to use weekly shots. A 6-day half-life also means the drug may keep acting for several weeks after it is stopped.
What kind of retatrutide shot studies used
Phase 1 begins the human safety checks, Phase 2 looks for benefit and common harm, and Phase 3 tests larger groups. In every study, researchers gave one shot each week into body fat under the skin [1][2][4].
No study had reported a pill, vein shot, or muscle shot by mid-2026. The belly, thigh, and upper arm appeared in the reports, but this isn't a shot guide.
What is known about keeping retatrutide stable
Health workers handled retatrutide inside supervised research and followed its rules. There are no approved rules for the form, storage, or shelf life of products outside a study [2].
Eli Lilly hasn't made its study storage notes public. That leaves you without sound storage rules for any outside vial.
What studies reveal about mixing retatrutide
There are no tested, published steps for how to mix retatrutide. No form of the drug has approval.
For human studies, the maker sent sites a prepared liquid for an under-skin shot. Staff didn't mix powder there.
Research-marked vials may come as powder, but there is no sound mixing rule. Their contents, strength, and freedom from germs haven't been checked [1].
Giving you a recipe would make an unapproved shot seem safer than it is. This site won't provide steps that could mislead you.
What can be said about retatrutide cost
What does retatrutide cost by prescription? There is no price yet because approval and prescription sale don't exist.
There was no maker's list price, insurance coverage, or pharmacy cost in mid-2026. Similar approved drugs can list for tens of thousands of dollars each year before help with the bill.
A future retatrutide price can't be read from that fact, even if Phase 3 studies lead to approval. The price and your access will depend on later business and government decisions.
Prices for research-marked products vary and come from an unregulated trade. They aren't a sound guide to a future pharmacy price for you.