Longevity, built around you.Licensed US clinicians·Third-party tested
Metabolic · Comparison

Retatrutide vs Tirzepatide. Investigational vs available.

The triple-agonist everyone's watching against the dual-agonist you can actually get today. What the trial signal shows, and what 'investigational' really means.

Where each stands
Retatrutide: Waitlist / comingTirzepatide: Available now
Waitlist / coming
RetatrutideGLP-1/GIP/glucagon · investigational
What it does

In trials, drives the largest average body-weight reduction seen to date for the class (reported ~24–29%).

Best evidence

Grade B, large Phase-3 trial data (TRIUMPH), figures pending peer review; re-verify.

What we don't know

Long-term safety and durability are not yet established; the trial program is ongoing and figures may change at peer review and approval.

Read the Retatrutide monograph
Available now
TirzepatideGIP/GLP-1 · available now
What it does

Supports the largest average weight loss and metabolic improvement seen in randomized trials to date.

Best evidence

Grade A, large randomized controlled trials (SURMOUNT / SURPASS).

What we don't know

Head-to-head long-term outcome data is still maturing; compounded-formulation specifics differ from the studied branded product.

Read the Tirzepatide monograph
How to think about choosing

Tirzepatide is available now under a clinician; retatrutide is an investigational triple agonist still in trials, not available to prescribe, and not something to source grey-market. The early signal for retatrutide is striking, but 'striking phase-2 data' is not 'approved, available, or proven durable.' If you want a supervised path now, the conversation is tirzepatide; retatrutide is one to track.

At a glance
Retatrutide
Tirzepatide
What it is
A single molecule agonizing three receptors, GLP-1, GIP, and glucagon, combining appetite suppression with an added energy-expenditure signal from glucagon.
A dual agonist at both GIP and GLP-1 receptors, amplifying satiety and glycemic effects beyond a GLP-1 alone.
What it's for
In trials, drives the largest average body-weight reduction seen to date for the class (reported ~24–29%).
Supports the largest average weight loss and metabolic improvement seen in randomized trials to date.
Evidence grade
Grade B
Grade A
Human data
large Phase-3 trial data (TRIUMPH), figures pending peer review; re-verify
large randomized controlled trials (SURMOUNT / SURPASS)
WADA status
Not prohibited
Not prohibited
Regulatory status
Investigational (Phase 3)
FDA-approved (branded) · 503A compounded
Key date
Not yet approved
Available now
Peptós availability
Waitlist / education
Available
The honest caveat

Retatrutide is investigational, no FDA approval, no legitimate compounded route, and unknown long-term safety. Impressive trial numbers are not a product you can buy. We track its status honestly rather than imply access.

Common questions

Can I get retatrutide?

No. Retatrutide is investigational and not FDA-approved; there is no legitimate compounded route. Anything sold as retatrutide today is research-grade / grey-market. Tirzepatide is the available, supervised option.

Is retatrutide stronger than tirzepatide?

Early-phase trials suggest large weight loss, but the data is younger and not outcome-mature, and it isn't available. Tirzepatide has grade-A randomized data and a supervised path now.

Medically reviewed by the Peptós.LIFE clinical team · Maintained by the Peptós.LIFE editorial team · Last updated June 2026. Educational content, not medical advice. Compounded medications are not FDA-approved.