Adipotide (FTPP): the complete research guide.

Adipotide was the peptide that was supposed to kill fat tissue by cutting off its blood supply. In 2011, it shrank obese monkeys by 11% body weight in four weeks. Then the Phase I human trial found kidney damage, and the story stopped.

What adipotide actually is

Adipotide is a synthetic peptide stitched together from two parts. The first part is a homing sequence (CKGGRAKDC) that binds a protein called prohibitin on the surface of blood vessels feeding white fat tissue. The second is a killer domain that disrupts mitochondrial membranes inside cells.

The full molecule was developed by the Pasqualini and Arap groups at MD Anderson, now Rutgers Cancer Institute. The design borrows directly from anti-cancer drugs: find a vascular bed, find a peptide that homes to it, attach something cytotoxic (Kolonin et al., 2004).

The category matters. Adipotide isn't a metabolic drug or an appetite suppressant. It's a cytotoxic agent that ablates the blood supply to fat tissue. Its closest conceptual neighbor is anti-cancer therapy, not semaglutide.

How it was supposed to work

Three steps. First, the homing sequence binds prohibitin on the endothelial cells of fat-tissue blood vessels. Prohibitin usually lives inside mitochondria, but on adipose endothelium it pops up on the cell surface. That's what gives adipotide its tissue selectivity.

Second, the peptide gets internalized. Third, the killer domain inserts into the mitochondrial inner membrane, the membrane collapses, and the cell dies by apoptosis (programmed cell death). Endothelial cells die, the microvasculature dies with them, and the fat tissue they fed shrinks (Barnhart et al., 2011).

This represents a fundamentally different mechanistic approach. Incretin drugs like semaglutide work upstream of fat mass through satiety signals. Adipotide targets the fat mass directly by ablating its blood supply — a mechanism conceptually closer to anti-cancer therapy than to metabolic intervention.

The 2011 monkey data, in plain terms

The headline study (Barnhart et al., 2011, Science Translational Medicine) treated naturally obese rhesus macaques with adipotide for four weeks. Here's what they reported:

• ~11% body-weight reduction at four weeks, mostly from white fat on imaging.
• Smaller waist measurements and less visceral fat on CT.
• Better insulin sensitivity (lower fasting insulin, better glucose tolerance).
• Weight stabilized or modestly regained after dosing stopped. That fits the mechanism, since there's no chronic satiety effect.
• Renal toxicity: elevated BUN and creatinine in treated animals. The authors flagged it as dose-limiting.

The 2011 media cycle focused on the weight loss. The kidney findings were in the paper, but they got far less attention in the press. That asymmetry is essentially why a grey market for adipotide still exists in 2026.

The Phase I human trial and the kidney signal

The Phase I trial was registered as NCT01477580 and enrolled obese prostate cancer patients. The developers picked that population because the cytotoxic mechanism overlapped with their oncology work.

The Phase I outcome that matters: renal toxicity was reported in treated patients, consistent with the BUN and creatinine elevations from the primate work. Adipotide leaves the body through the kidneys, and the killer domain has potential for off-target damage to kidney tissue.

Was the renal signal dose-titratable? We'll never know. Phase II never happened. No peer-reviewed efficacy results from NCT01477580 have appeared in PubMed. That's the central honest fact about adipotide in 2026. The kidney signal is the documented reason the molecule has been frozen for more than a decade.

Adipose research peptides — catalog reference.

No adipotide stocked GLP-1 class available Educational coverage only

Peptriva does not stock adipotide due to the Phase I kidney signal and the absence of Phase II/III safety data. Coverage here is educational only. For weight-loss research, the GLP-1 class has documented human safety data.

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Why the field moved on

Two things happened between 2011 and 2026 that closed adipotide's clinical case.

First, the kidney signal didn't go away. The original developers had every academic and commercial reason to advance the program. They didn't. Fifteen years of silence on a flagship clinical asset is itself the data point.

Second, the incretin class arrived. Semaglutide hit ~15% mean weight loss in STEP and earned FDA approval as Wegovy in 2021. Tirzepatide hit 22.5% in SURMOUNT-1 and approval as Zepbound in 2023. Retatrutide hit 24.2% at the highest dose in the 2023 Phase II NEJM trial, with Phase III TRIUMPH still running.

Adipotide's framing was “weight loss without appetite suppression” — a differentiated mechanism relative to what the incretin class had demonstrated in 2011. By 2026, tirzepatide and retatrutide had produced 22–24% mean body-weight reductions in Phase III RCTs, making the adipotide framing redundant on efficacy grounds while the kidney signal remained unresolved.

The published literature reflects the move. The two recent indexed papers (2020–2026) don't treat adipotide as a weight-loss drug at all. They repurpose the homing sequence as a delivery vehicle (heme oxygenase-1 inducers for fatty liver disease; Hong & Kim, 2022) or as an MRI imaging probe (Hu et al., 2020). The homing sequence still has value. The cytotoxic version does not.

Risks and the grey-market reality

• Renal toxicity in both primate and Phase I human dosing. Elevated BUN and creatinine in both data sets. This is the signature safety finding of the molecule.
• Cytotoxic mechanism with no chronic dosing data. Repeated cycles of fat-vessel ablation and regrowth have no long-term human safety record. The closest analog is anti-cancer therapy, where patient timelines are shorter than the obesity treatment horizon.
• Off-target potential. Prohibitin shows up in many tissues. The homing sequence isn't perfectly selective for fat vasculature. Effects on heart, liver, or kidney blood vessels are theoretically possible.
• Manufacturing complexity creates identity risk. Real adipotide needs correct disulfide bonds in the cyclic homing domain plus correct D-amino-acid composition in the killer domain. Grey-market vendors can't reliably demonstrate that.
• Vendor marketing leans on a 15-year-old story. Product pages reference the 2011 monkey results while skipping the kidney signal and the missing Phase II/III data.
• Evidence comparison. The preclinical data supporting adipotide predates the modern incretin class by over a decade, and the documented kidney signal accompanies it. The incretin class has since demonstrated superior Phase III evidence and documented human safety profiles.

Regulatory and legal status

• FDA: Not approved for any indication. No active IND has produced peer-reviewed Phase II/III obesity data.
• EMA: Not approved.
• WADA: Not explicitly listed by name. The anti-vasculature mechanism doesn't map cleanly onto standard performance-enhancement categories.
• Research compound status: Sale as a research reference compound labeled for laboratory use is permitted in the US. Marketing it as a weight-loss therapeutic crosses into FDA jurisdiction.

What adipotide should and shouldn't be used for

The defensible scientific use of the homing sequence in 2026 is as a delivery vehicle for safer payloads. That's what the recent literature shows happening. In that framing, the targeting peptide keeps its scientific value, and the cytotoxic killer domain (along with its kidney baggage) gets left behind.

The original framing of adipotide as a weight-loss drug doesn't survive honest scrutiny. The Phase I kidney signal closed that door. The incretin class's arrival made reopening it commercially indefensible.

GLP-1 / incretin class reference compounds.

Phase III data FDA-approved analogs COA per lot

The incretin receptor agonist class that superseded adipotide in published obesity research. Tirzepatide and retatrutide have completed Phase III RCTs and documented human safety profiles. Research-grade reference compounds with COA available per lot.

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Frequently asked questions

What is adipotide?

Adipotide (FTPP) is a synthetic peptide that pairs a fat-vessel homing sequence with a cytotoxic killer domain. It targets the blood supply of white fat tissue and triggers apoptosis. It's a cytotoxic anti-vasculature agent, not a metabolic drug, and it's not FDA-approved.

Did adipotide cause kidney toxicity in humans?

Yes. The Phase I trial (NCT01477580) and the 2011 monkey studies both flagged renal toxicity with elevated BUN and creatinine. The killer domain has off-target potential on kidney tissue, and the drug is excreted renally. That signal is the main reason clinical development has been frozen for fifteen years.

Why is adipotide still sold if it failed Phase I?

The 2011 monkey weight-loss story got heavy media coverage and created lasting consumer demand. Grey-market vendors lean on that 15-year-old story and skip over the kidney signal. It's the textbook pattern of a peptide whose press cycle outlasted the science that disconfirmed it.

How does it compare to incretin drugs?

Different drug classes entirely. Tirzepatide and retatrutide are incretin drugs with multiple Phase III trials, documented safety profiles, and 22–24% mean weight loss. Adipotide is a cytotoxic agent with no Phase II/III trials and a known kidney signal. We can't find a clinical scenario in 2026 that favors adipotide over an FDA-approved incretin.

Is adipotide FDA-approved?

No. One Phase I trial (NCT01477580) was registered. It produced no peer-reviewed efficacy publications. No Phase II or III trials exist. Selling it as a research reference compound labeled for lab use is permitted. Marketing it for human weight loss is not.

Has adipotide been investigated as a weight-loss agent in humans?

One registered Phase I trial (NCT01477580) enrolled obese prostate cancer patients, but no peer-reviewed Phase II or III efficacy results have been published. The trial documented a renal toxicity signal consistent with the primate data. Development has not advanced in over a decade. The incretin class has since accumulated multiple Phase III RCTs and documented human safety data that the adipotide literature does not have.