FOXO4-DRI Where to Buy: Judge the Assay, Not the Price
FOXO4-DRI where to buy comes down to which supplier publishes a measured fill figure. Most publish purity only, and purity is not the number that varies.
MEDICAL DISCLAIMER: Educational research guidelines only. Lyophilized peptides are investigational chemical compounds and are NOT approved for human consumption, diagnosis, or therapy. Consult a licensed physician before any research application.
FOXO4-DRI where to buy has one real answer, research-peptide suppliers, because no pharmacy anywhere can dispense a compound with no approval. That narrows the question to which supplier, and on this site the deciding criterion is arithmetic: does the vendor publish a measured net content figure, or only a purity percentage?
The distinction is not academic. Purity and quantity are different measurements, and it is quantity that determines what a vial is actually worth.
Where the assayed figures come from
FOXO4-DRI — Ascension Peptides
Independently assayed research material. With the code the 10 mg vial works out at $6.70/mg on the label figure.
The two published certificates cover different batches and disagree on net content: Kovera Labs assays batch 55-05260628 at 11.41 mg, MZ Biolabs assays lot 55-01260229 at 8.30 mg, both against a 10 mg label. That moves the real figure between $5.87/mg and $8.07/mg. Endotoxin and sterility screens appear on the Kovera batch only. Buying 3, 5 or 10 takes 3%, 5% or 10% off list.
- Two third-party assays, two different batches
- Free carriage over $250
- Same-day dispatch before 2pm CST
Laboratory research material only, not for human consumption. FOXO4-DRI is not an approved medicine in any market and has never been tested in a human trial. Affiliate links: we may earn a commission at no additional cost to you. Figures checked September 2, 2026.
FOXO4-DRI where to buy: the criteria that carry arithmetic
Most buying checklists are qualitative. These are the ones that change a number.
| Criterion | What it changes | How often published |
|---|---|---|
| Measured net content | Cost per mg, and every concentration you calculate | Rarely |
| Batch-specific lot number | Whether the certificate describes your vial at all | Sometimes |
| HPLC purity | What fraction of the mass is the target molecule | Usually |
| Mass spec identity | Whether it is the right molecule | Sometimes |
| Endotoxin and sterility | Contamination risk, per batch | Batch-dependent |
| Named laboratory | Whether any of the above is checkable | Often absent |
The top row is the one this site cares about most and the one the market publishes least. A vendor stating 99% purity and nothing about fill has told you about composition while leaving quantity entirely to the label.
What Ascension's two certificates actually show
Ascension publishes measured fill, which is unusual, and doing so exposes something a less transparent vendor would have hidden.
| Kovera Labs | MZ Biolabs | |
|---|---|---|
| Batch | 55-05260628 | 55-01260229 |
| Date | Certified 15 June 2026 | Analysed 10 January 2026 |
| Purity | 99.411% | 99.97% |
| Net content, 10 mg label | 11.41 mg | 8.30 mg |
| Endotoxin screen | Pass, at or below 0.5 EU/mL | Not performed |
| Sterility screen | No growth | Not performed |
One batch came in 14% over the labelled mass, the other 17% under. Both certificates are genuine and the vendor publishes both. That is the honest picture, and it is more useful than a cleaner story would be.
Note also that testing scope is a property of the batch. The endotoxin and sterility screens exist on the June lot and not the January one, so a claim that this product is endotoxin tested is generalising from one certificate.
What the fill variance does to your working numbers
Every downstream figure inherits the starting mass, which is why this matters beyond bookkeeping.
| Assumed mass | Cost per mg at $67.00 | Concentration in 2 mL |
|---|---|---|
| 10 mg, label | $6.70 | 5.00 mg/mL |
| 11.41 mg, Kovera | $5.87 | 5.71 mg/mL |
| 8.30 mg, MZ Biolabs | $8.07 | 4.15 mg/mL |
Anyone reconstituting the January batch on the label assumption is working 17% below the concentration they wrote down. Our FOXO4-DRI calculator handles the conversion correctly once given the right figure, and the dosage reference covers the handling side.
What no supplier can sell you
Worth stating before any purchase, because it applies regardless of which vendor you choose.
FOXO4-DRI has never been administered to a human being in a registered clinical trial. There is no approved product in any market, no established human dose, no measured half-life in people, and no safety profile. The published evidence is entirely mice, rats and cultured cells, beginning with the 2017 study that reported restored fitness, fur density and renal function in aged mice.
Senolysis is also not uniformly beneficial. A 2023 study found that clearing senescent cells could promote the development and progression of pulmonary hypertension, which is a reminder that the effect depends on tissue and context.
Frequently Asked Questions
Where can you buy FOXO4-DRI?expand_more
From research-peptide suppliers, sold as laboratory material. There is no pharmacy or clinic route, because the compound has no marketing authorisation anywhere and no approved product exists to dispense.
What should I check before buying?expand_more
A batch-specific certificate naming the lot on your vial, a named testing laboratory, purity by HPLC and identity by mass spectrometry, and ideally a measured net content figure. That last one is rare and is the number that changes your arithmetic.
Why do the two published certificates disagree?expand_more
Because they cover different batches and measure different properties. Both tested above 99% pure, but one assayed 11.41 mg of net content and the other 8.30 mg, against the same 10 mg label.
Does a high purity figure mean a full vial?expand_more
No. Purity is the proportion of present material that is the target molecule; net content is how much material is present. A vial can be 99.97% pure and still hold 8.30 mg where the label says 10 mg.
References & Citations
- [1]
Baar MP, Brandt RMC, Putavet DA, et al. Targeted Apoptosis of Senescent Cells Restores Tissue Homeostasis in Response to Chemotoxicity and Aging. Cell. 2017;169(1):132-147.e16.View source →
- [2]
Eliminating Senescent Cells Can Promote Pulmonary Hypertension Development and Progression. Circulation. 2023.View source →