---
title: "FOXO4-DRI: what sources report"
url: https://humanpeptides.fyi/peptides/foxo4-dri
site: humanpeptides.fyi
last_reviewed: 2026-10-11
---


# FOXO4-DRI

> humanpeptides.fyi makes no claims of its own. Every statement below reports what a cited source says, with its link. Not medical advice.

FOXO4-DRI: Synthetic D-retro-inverso peptide that disrupts FOXO4-p53 binding, pushing senescent cells into apoptosis (a senolytic). The sources cited here most often discuss it for: Clears senescent cells, mice; Chemo toxicity protection, mice; Kidney function, mice. Evidence label: Preclinical.

## At a glance

- **Type:** Peptide
- **Family:** Longevity & Mitochondria
- **Evidence label:** Preclinical (2 of 5)
- **Regulatory status:** Not FDA-approved for any indication and never tested in a registered human trial; in the US it is classified as unregulated and is available as a research chemical.
- **Goals discussed:** Longevity & Cellular Aging, Hair, Energy & Endurance, Heart, Liver & Kidney
- **Also called:** Proxofim, FOXO4-D-Retro-Inverso, FOXO4 DRI, FOXO4DRI, fox04
- **Last reviewed:** 2026-10-11

## What is FOXO4-DRI?

- Synthetic D-retro-inverso peptide that disrupts FOXO4-p53 binding, pushing senescent cells into apoptosis (a senolytic); experimental, never tested in a registered human trial; not FDA-approved. Sources: <https://pubmed.ncbi.nlm.nih.gov/28340339/>, <https://peptideinsider.org/foxo4-dri-side-effects/>

Some products are labeled only as FOXO4, and users report uncertainty about whether these are FOXO4-DRI. Proxofim is a commercial name rather than a name used in the scientific literature.

**Regulatory status:** Not FDA-approved for any indication and never tested in a registered human trial; in the US it is classified as unregulated and is available as a research chemical. Source: <https://www.peptideprotocolwiki.com/peptides/foxo4-dri>

## What is FOXO4-DRI researched for?

### 1. Clears senescent cells, mice

- Senolytic: selectively killed senescent cells via p53 nuclear exclusion; restored fitness, fur density and kidney function in fast-aging and naturally aged mice (animal, Baar et al. Cell 2017) Sources: <https://pubmed.ncbi.nlm.nih.gov/28340339/>, <https://www.cell.com/cell/fulltext/s0092-8674(17>
- Goals: [Longevity & Cellular Aging](https://humanpeptides.fyi/objectives/longevity), [Hair](https://humanpeptides.fyi/objectives/hair), [Energy & Endurance](https://humanpeptides.fyi/objectives/energy)

### 2. Chemo toxicity protection, mice

- Chemotoxicity protection: reduced doxorubicin-induced liver toxicity in mice (animal) Sources: <https://pubmed.ncbi.nlm.nih.gov/28340339/>
- Goals: [Longevity & Cellular Aging](https://humanpeptides.fyi/objectives/longevity)

### 3. Kidney function, mice

- Kidney function: lowered plasma urea and creatinine in aged mice, indicating restored renal filtration (animal) Sources: <https://www.cell.com/cell/fulltext/s0092-8674(17>
- Users report subjective improvements in some, nothing in others (anecdotal) Sources: <https://www.reddit.com/r/Biohacking/comments/1srayzl/foxo4dri_any_firsthand_experiences/>
- Goals: [Heart, Liver & Kidney](https://humanpeptides.fyi/objectives/organs)

## What do researchers and users say about FOXO4-DRI?

> "Thus, therapeutic targeting of senescent cells is feasible under conditions where loss of health has already occurred and in doing so tissue homeostasis can effectively be restored."
>
> Baar MP, et al., Targeted Apoptosis of Senescent Cells Restores Tissue Homeostasis in Response to Chemotoxicity and Aging (Cell, 2017). <https://pmc.ncbi.nlm.nih.gov/articles/PMC5556182/>

Context: Conclusion of the mouse study that introduced FOXO4-DRI.

> "It is unclear as how many people are choosing to do that, and certainly we'll never see any sort of useful data resulting from that use."
>
> Fight Aging!, People Are Still Working on the Senolytic Peptide FOXO4-DRI. <https://www.fightaging.org/archives/2026/02/people-are-still-working-on-the-senolytic-peptide-foxo4-dri/>

Context: Refers to people buying FOXO4-DRI from peptide sellers for personal use.

> "I had a dull headache for the first 3 days and felt a little sluggish for the first 5 days."
>
> Anonymous user, r/Biohacking, FOXO4-DRI - any first-hand experiences?. <https://www.reddit.com/r/Biohacking/comments/1srayzl/foxo4dri_any_firsthand_experiences/>

Context: One user's self-report; the same user also noted weight loss and more frequent urination. Anecdotal.

## What side effects of FOXO4-DRI are reported?

- No human trial data; users report injection-site burning, flu-like symptoms, fatigue, headaches; one unverified report of severe blood pressure rise; theoretical concerns re p53 tumor suppression (anecdotal/review) Sources: <https://peptideinsider.org/foxo4-dri-side-effects/>, <https://thelongevityarchive.com/compounds/foxo4-dri>
- More frequent urination reported by a user during a course. (anecdotal) Sources: <https://www.reddit.com/r/Biohacking/comments/1srayzl/foxo4dri_any_firsthand_experiences/>
- Diarrhea and injection-site reactions are among reported effects. (anecdotal) Sources: <https://www.peptideprotocolwiki.com/peptides/foxo4-dri>
- Senescent cells also help with wound healing and tissue repair, so clearing them could in theory interfere with those processes. (theoretical) Sources: <https://www.peptideprotocolwiki.com/peptides/foxo4-dri>
- Whether repeated doses of this synthetic D-amino-acid peptide trigger immune reactions has not been studied. (theoretical) Sources: <https://www.peptideprotocolwiki.com/peptides/foxo4-dri>

## What do peptide guides say about FOXO4-DRI?

- **PepEdHub:** PepEdHub explains that FOXO4-DRI stops FOXO4 from holding p53 inside senescent 'zombie cells', letting them self-destruct, and cautions that human safety data are limited. <https://pepedhub.com/peptides/foxo4-dri>
- **NCBI PMC:** In naturally aged mice, FOXO4-DRI cleared senescent testosterone-producing Leydig cells and eased the age-related drop in testosterone secretion. <https://pmc.ncbi.nlm.nih.gov/articles/PMC7053614/>
- **Fight Aging!:** Fight Aging! reports that Cleara Biotech was formed to commercialize the original FOXO4-DRI work but remains preclinical, focusing more on the FOXO4-p53 target than on the peptide itself. <https://www.fightaging.org/archives/2026/02/people-are-still-working-on-the-senolytic-peptide-foxo4-dri/>
- **Peptide Protocol Wiki:** Peptide Protocol Wiki notes the key FOXO4-DRI findings come mainly from one research group, with limited independent replication and no human trials started or registered. <https://www.peptideprotocolwiki.com/peptides/foxo4-dri>

## What does the research say, system by system?

### Body & tissues

- Kidney, liver, hair/fur in mice (animal) Sources: <https://pubmed.ncbi.nlm.nih.gov/28340339/>

### Hormones & physiology

- Targets p53-FOXO4 axis; reduced senescence markers (animal) )30246-5.pdf Sources: <https://www.cell.com/cell/pdf/S0092-8674(17>

### Cells & mitochondria

- Induces apoptosis selectively in senescent cells, reducing senescent-cell burden (animal/in vitro) Sources: <https://pubmed.ncbi.nlm.nih.gov/28340339/>

### Brain, mood & sleep

- Improved responsiveness and running activity in aged mice (animal) )30246-5.pdf Sources: <https://www.cell.com/cell/pdf/S0092-8674(17>

### Weight & metabolism

- Occasional weight loss reported by users (anecdotal) Sources: <https://peptideinsider.org/foxo4-dri-side-effects/>

### Muscle

- Improved fitness/running in aged mice; no muscle-specific data (animal) Sources: <https://pubmed.ncbi.nlm.nih.gov/28340339/>

### Also notable

- Restored fur density in aged mice (animal) Sources: <https://pubmed.ncbi.nlm.nih.gov/28340339/>
- Very expensive; used in pulsed senolytic protocols by biohackers (anecdotal) Sources: <https://www.reddit.com/r/Biohackers/comments/vckxlp/experience_with_fox04dri/>

## How strong is the evidence for FOXO4-DRI?

**Preclinical** (2 of 5). Animal (one landmark mouse study) + anecdotal; no human trials

_Mostly cell and animal studies. Human effects unknown._

## Questions about FOXO4-DRI

### What is FOXO4-DRI?

Synthetic D-retro-inverso peptide that disrupts FOXO4-p53 binding, pushing senescent cells into apoptosis (a senolytic). Some products are labeled only as FOXO4, and users report uncertainty about whether these are FOXO4-DRI. Proxofim is a commercial name rather than a name used in the scientific literature.

### Is FOXO4-DRI FDA-approved?

Not FDA-approved for any indication and never tested in a registered human trial; in the US it is classified as unregulated and is available as a research chemical.

### What is FOXO4-DRI researched for?

The sources cited on this page most often discuss three outcomes: Clears senescent cells, mice; Chemo toxicity protection, mice; Kidney function, mice. Each line above shows what the source reports and how strong that evidence is.

### What side effects of FOXO4-DRI are reported?

Reported in the cited sources: No human trial data; users report injection-site burning, flu-like symptoms, fatigue, headaches; one unverified report of severe blood pressure rise; theoretical concerns re p53 tumor suppression; More frequent urination reported by a user during a course; Diarrhea and injection-site reactions are among reported effects. The list is not complete, and few listed risks does not mean a compound is safe.

### How strong is the evidence for FOXO4-DRI?

Evidence label: Preclinical. Animal (one landmark mouse study) + anecdotal; no human trials.

### What else is FOXO4-DRI called?

Names used for it include Proxofim, FOXO4-D-Retro-Inverso, FOXO4 DRI, FOXO4DRI, fox04.

### Does humanpeptides.fyi recommend FOXO4-DRI?

No. humanpeptides.fyi makes no claims and no recommendations of its own. It summarizes and links to what others have published and posted. Nothing here is medical advice; talk to a licensed clinician.

---
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