FOXO4-DRI where to buy is a question with a short answer and a long caveat. The short answer is that a handful of research-peptide suppliers stock it and one of them publishes batch testing worth reading. The long caveat is that this compound has never been given to a human being in a registered trial, so every purchase is laboratory material bought on laboratory terms.
Key takeaways
- FOXO4-DRI is a senolytic, not an anabolic. It has no action on the myostatin pathway, no hypertrophy data in any organism, and buying it expecting a lean-mass gain is a category error.
- There are zero registered human trials of FOXO4-DRI. Everything known about it comes from mice, rats, and cells in a dish.
- The decision is not which vendor is cheapest but which one publishes a batch-specific certificate you can actually match to the vial in your hand.
- Ascension's two published reports measured 11.41 mg and 8.30 mg of net content in a vial labelled 10 mg. Both are genuine, and the difference matters more than the price.
- Testing scope is a property of the batch, not the product. Only one of those two batches carries endotoxin and sterility screening.
The vendor we point lifters to
FOXO4-DRI from Ascension Peptides
Independently assayed material, dispatched from the US. The vial drops by half with the code below.
One vial size only, so there is no bulk-tier price break to chase on a single order. Per-mg is quoted at the labelled 10 mg: the two published batch reports measured 11.41 mg and 8.30 mg, so the real figure moves with the batch. Buying 3, 5 or 10 takes 3%, 5% or 10% off. Free shipping starts at $250. The vendor spells the product FOX04 with a zero, including in the link above.
- Batch-specific third-party lab report
- Free delivery above $250
- Same-day dispatch on orders before 2pm CST
Research material, laboratory use only, not for human consumption. FOXO4-DRI is not an approved medicine anywhere and has never been tested in a human trial. Affiliate links: we may earn a commission at no extra cost to you. Pricing verified September 2, 2026.
FOXO4-DRI where to buy: the criteria that decide it
Most pages answering this query are a list of storefronts. A list is not a decision. What separates a supplier worth using from a reshipper with a nice logo is a small number of checkable things, and none of them is the headline price.
| Criterion | What good looks like | Why it decides the purchase |
|---|---|---|
| Batch-specific certificate | A report naming the lot number stamped on your vial | A generic certificate proves a different vial was once tested |
| Named testing laboratory | An identifiable lab with an address | "Third-party tested" with no lab named is unfalsifiable |
| Purity method | HPLC for purity, LC-MS for identity | Purity alone does not confirm you have the right molecule |
| Net content stated | An actual measured milligram figure | Labelled mass and measured mass are different numbers |
| Contamination screening | Endotoxin and microbial results | Absent on many batches, and its absence is rarely disclosed |
| Dispatch origin | Domestic stock, not a forwarded parcel | Determines customs exposure and whether returns exist |
| Human-use claims | None, anywhere on the listing | A vendor claiming human use is telling you they are unregulated |
Work down that list before comparing prices. A cheap vial with no matchable certificate is not cheaper, it is unidentified.
Why a muscle-focused reader ends up on a senolytic page
This site is about myostatin, follistatin and holding on to lean tissue. FOXO4-DRI is none of those things, so it is worth being precise about why it appears here at all.
Cellular senescence is one of the mechanisms behind age-related muscle loss. Senescent cells accumulate in ageing tissue, stop dividing, and secrete an inflammatory mix of cytokines and proteases known as the senescence-associated secretory phenotype. In muscle, that inflammatory background is part of why satellite cells, the resident repair population, become worse at responding to damage as you age. Sarcopenia is not only a matter of anabolic signalling falling; it is also a matter of the repair environment degrading.
A senolytic is a compound that selectively kills senescent cells. That is a genuinely different lever from anything on the myostatin axis, which is about restraining or releasing a growth brake. One clears debris, the other adjusts a signal. Confusing them is the most common error in this corner of the internet.
If you came here from the myostatin inhibitor material, hold that distinction firmly. Interest in FOXO4-DRI should be interest in tissue maintenance, not in growth.
What the two certificates actually say
Ascension publishes two certificates for FOXO4-DRI, from two laboratories, covering two different batches. Reading both is more informative than reading either.
| Kovera Labs | MZ Biolabs | |
|---|---|---|
| Batch | 55-05260628 | 55-01260229 |
| Date | Certified 15 June 2026 | Analysed 10 January 2026 |
| Purity | 99.411% against a >98% specification | 99.97% |
| Net content, 10 mg vial | 11.41 mg | 8.30 mg |
| Methods | HPLC, LC-MS identity | HPLC-UV-MS |
| Endotoxin screen | Pass, at or below 0.5 EU/mL | Not performed |
| Sterility screen | No growth | Not performed |
Look at the net content row rather than the purity row. One batch came in roughly 14% above the labelled mass, the other roughly 17% below it. Both certificates are authentic and the vendor publishes both. Purity was excellent in each case, which is precisely the point: a vial can be 99.97% pure and still contain considerably less peptide than the label claims, because purity and quantity are separate measurements.
The practical consequence is that a per-milligram price is softer than it looks. At $67.00 with the discount code, a vial holding 11.41 mg works out near $5.87 per mg, while one holding 8.30 mg is closer to $8.07 per mg. Same product, same price, a spread of roughly 37% in what you actually received. Anyone quoting a single confident per-mg figure for this compound has not opened the certificates.
The second consequence concerns the screening rows. The June batch was checked for endotoxins and microbial growth. The January batch was not. Testing scope belongs to a batch, so "third-party tested for endotoxins" is a statement about one lot rather than a standing feature of the product. Check the report for the lot you are sent, not the PDF linked from the product page, which is not always the most recent one.
Scoring the supplier honestly
Against the criteria above, Ascension does well on the things that are checkable and is mixed on one.
It publishes batch-specific certificates from two named laboratories with real addresses. It runs both purity and identity methods rather than purity alone. It states net content numerically instead of hiding behind the labelled figure, which is more disclosure than most of this market offers. It ships domestically with same-day dispatch on orders placed before 2pm CST, and free shipping begins at $250. The listing carries a research-use-only designation and makes no human-use claims.
Where it is mixed: the net fill varied substantially between the two published batches, and only the more recent one carries contamination screening. Neither of those is concealed, which is why they are knowable at all, but a buyer should factor them in rather than read "two certificates" as a guarantee of consistency.
One cosmetic oddity worth knowing before you click. The vendor spells the product FOX04 with a digit zero, in the listing title and the product URL. The scientific name is FOXO4, from Forkhead box protein O4, where the O is a letter. A listing spelled with a zero is the same product, not a counterfeit, but the mismatch is exactly the kind of thing that makes a careful buyer hesitate.
What this compound will not do
Be blunt about the limits, because the search traffic arriving at senolytic pages is full of people hoping otherwise.
FOXO4-DRI does not build muscle. It is not anabolic, it does not act on myostatin, activin or follistatin, and no study in any species has measured hypertrophy or performance as an outcome. The foundational work, Baar and colleagues in Cell in 2017, reported restored fitness, fur density and renal function in aged and fast-ageing mice, alongside protection against doxorubicin toxicity. Those are mouse healthspan endpoints, not a body-composition result, and they have never been reproduced in people.
Nor is senolysis automatically beneficial. Clearing senescent cells removes a population that also performs useful work, including tumour suppression and wound repair. A 2023 paper in Circulation reported that eliminating senescent cells could promote the development and progression of pulmonary hypertension. Any page presenting this class as uniformly good is not describing the literature.
For the underlying arithmetic on turning a vial into a working concentration, the peptide calculator applies here as it does to anything else, with the caveat that the net-fill spread above makes the label a weaker starting assumption than usual. If you are comparing suppliers across compounds, the vendor-reading approach in the follistatin buying guide transfers directly.
Frequently asked questions
Where can you buy FOXO4-DRI?
Research-peptide suppliers stock it, sold as laboratory material. There is no pharmacy or clinic route, because FOXO4-DRI has no marketing authorisation from the FDA, EMA or MHRA and no approved product exists to dispense. Ascension Peptides is the supplier we point readers to, on the grounds that it publishes batch-specific certificates from named laboratories and states measured net content rather than only the labelled figure.
How much does a vial cost?
The 10 mg vial lists at $199.99, currently sells at $134.00, and comes to $67.00 with the code PEPTIDEDECK. That is $6.70 per mg at the labelled mass, though the published batch reports measured 11.41 mg and 8.30 mg, which moves the real figure to roughly $5.87 or $8.07 per mg depending on the lot.
Is FOXO4-DRI legal to buy?
In the United States it is legal to sell and buy as research material, which is the basis on which suppliers list it. It is not legal to market it for human use, and no vendor doing so should be trusted. Importing into the UK or EU adds customs and regulatory risk that sits with the buyer.
Will FOXO4-DRI help me build or keep muscle?
There is no evidence that it builds muscle, and no study in any species has measured hypertrophy or strength. The interest for a body-composition audience is theoretical and concerns senescent-cell accumulation as one contributor to age-related muscle decline. That is a maintenance hypothesis, not a growth claim, and it has not been tested in humans.
Why do some listings spell it FOX04?
Because of a typo that became a product URL. The compound is FOXO4-DRI, after Forkhead box protein O4, so the fourth character is a letter O. Several vendors, including Ascension, render it as a zero. It is the same material, but it is worth knowing before a spelling mismatch makes you doubt an otherwise legitimate listing.