Cognitive · Reference
Do You Need a Prescription for PE-22-28? Is It Legal to Buy Online?
At Pepti, PE-22-28 is prescribed by a physician licensed in your state and costs $219 a month all-in for a 5 mL vial holding 10 mg at 2 mg/mL. The ordering steps are on the PE-22-28 how-to-get page; this page covers the prescription and legal questions.
Treatments mentioned
Yes. PE-22-28 for human use in the United States requires a prescription from a licensed physician, filled by a licensed compounding pharmacy. PE-22-28 sold online without a prescription is a research-use-only product whose seller disclaims human use. The FDA has never evaluated PE-22-28: it is not in Category 1, 2 or 3 of the FDA's 503A nominated-substances list, has no FDA safety notice and was not on the July 2026 advisory committee agenda. It is not FDA approved, compounded medications never are, and it has no published human trials of any kind, which is exactly why a physician review matters.
At Pepti, PE-22-28 is prescribed by a physician licensed in your state and costs $219 a month all-in for a 5 mL vial holding 10 mg at 2 mg/mL. The ordering steps are on the PE-22-28 how-to-get page; this page covers the prescription and legal questions.
Do You Need a Prescription for PE-22-28? Is It Legal to Buy Online?
The short answer
| Question | Answer |
|---|---|
| Do you need a prescription for PE-22-28? | Yes, to obtain it as a medication for your own use |
| Is it legal to buy PE-22-28 online? | Yes, through a licensed physician's prescription filled by a licensed pharmacy |
| What is "research use only" PE-22-28? | A product sold on the basis that human use is disclaimed |
| Is PE-22-28 FDA approved? | No. No drug agency has approved it for anything |
| Has the FDA flagged or banned it? | No. The FDA has not evaluated it at all |
| Was it removed from Category 2 in April 2026? | No, because it was never on it |
| Is it an antidepressant? | Not in the regulatory sense; it has no human trials |
| Is it allowed in tested sport? | Not named on the 2026 WADA list, but the S0 catch-all can apply |
| Pepti price | $219 a month all-in |
Do You Need a Prescription for PE-22-28? Is It Legal to Buy Online?
What PE-22-28 is, and why that matters for the prescription question
PE-22-28 is a seven-amino-acid fragment of the sortilin propeptide, a 44-amino-acid piece clipped off when the body makes the sortilin receptor. Researchers in Nice, France found that part of that propeptide, which they named spadin (residues 12 to 28), blocks a potassium channel in nerve cells called TREK-1. PE-22-28 is the shorter version, residues 22 to 28 only, described in Frontiers in Pharmacology in 2017. The same peptide is written PE 22-28, PE-22-28 and PE22-28. The full background is in what is PE-22-28.
Two features shape the legal and practical picture:
- It has no human trials. Everything published on PE-22-28 itself is cell and rodent work. There is no human dose-finding study, no human safety data and no human efficacy data.
- Its proposed mechanism runs through serotonin signalling. In rodents, blocking TREK-1 on serotonergic neurons was associated with increased firing, the same direction of effect SSRIs are thought to produce by a different route. That makes the medication list the most important part of the intake.
Do You Need a Prescription for PE-22-28? Is It Legal to Buy Online?
Why PE-22-28 is prescription-only
The federal rule
Section 503(b) of the Federal Food, Drug, and Cosmetic Act makes a drug prescription-only when it is "not safe for use except under the supervision of a practitioner licensed by law to administer such drug," including because of "the method of its use." An injectable peptide with no human safety data meets that description. Dispensing it without a prescription makes it misbranded, and the violation attaches to the dispenser. See are peptides legal in the US.
How a compounded prescription is lawful
Compounded PE-22-28 is not FDA approved. Its legal footing is section 503A, which exempts a drug compounded "for an identified individual patient based on the receipt of a valid prescription order" by a licensed pharmacist in a state-licensed pharmacy. That is why the vial carries your name and directions. State law decides who may prescribe to you and which pharmacies may ship to your state. Pepti prescribes PE-22-28 in every state except Oklahoma, plus DC.
Why the physician review matters for PE-22-28
What a physician weighs Why Antidepressants, triptans, lithium, tramadol or any other serotonergic drug The proposed mechanism overlaps with serotonin signalling, and the combination has never been studied in people A diagnosed mood disorder PE-22-28 is not a treatment for depression, and no existing antidepressant should be stopped on the strength of a rodent literature Diabetes or glucose-lowering medication Cell work described the parent peptide increasing insulin secretion from pancreatic beta cells A seizure history TREK-1 is involved in seizure protection; the rodent work found no problem, but it should be discussed Pregnancy or breastfeeding Not used; safety data is absent Tested sport See the sport row below There is no established interaction list, because the trials that would produce one have not been run. That is why a physician reads your medications rather than a form. New or worsening thoughts of self-harm are an emergency that no peptide addresses: contact a crisis line or call 911.
Do You Need a Prescription for PE-22-28? Is It Legal to Buy Online?
Where PE-22-28 stands with the FDA
As Pepti's reference page records it, checked in September 2026:
| FDA list or process | PE-22-28 |
|---|---|
| 503A nominated substances, Category 1, 2 or 3 (updated 14 May 2026) | Not listed in any category |
| Significant-safety-risk page | Not mentioned, either in the current Category 2 table or among substances withdrawn from it |
| The peptides removed from Category 2 in April 2026 | Not among them; it was never there |
| 503A bulks list at 21 CFR 216.23 | Not listed; it still holds the six substances placed there in 2019 |
| Pharmacy Compounding Advisory Committee, 23 to 24 July 2026 | Not on the agenda, which covered BPC-157, KPV, TB-500, MOTS-c, DSIP, Semax and Epitalon |
| FDA approval as a drug | None |
The accurate summary is never categorised, never flagged, never reviewed. The FDA's 503A page also notes that substances nominated on or after 7 January 2025 are no longer placed into the interim categories at all. The FDA has expressed no view on PE-22-28 either way, which is different from a substance that has been through the process and been recommended for or against. Where a substance sits with the FDA is one input into a compounding pharmacy's decision to prepare it; state pharmacy law and the pharmacy's own regulatory judgement are the others.
Do You Need a Prescription for PE-22-28? Is It Legal to Buy Online?
What a research-use-only vial is
Research sellers rely on 21 CFR 201.125, which exempts a drug from carrying directions for use when it is sold to people "regularly and lawfully engaged" in research "not involving clinical use." A person injecting it is the clinical use excluded. Under 21 CFR 201.128, the seller's own advertising shows a product's intended use, so mood or focus claims beside a "not for human consumption" label contradict each other. More is in can you buy peptides without a prescription.
| Prescription | Research-use-only vial | |
|---|---|---|
| Physician reviews serotonergic medications and mood history | Yes | No |
| Sterility and endotoxin requirements | Required for a compounded injectable | None |
| Your name and directions on the vial | Yes | "Not for human consumption" |
| Refrigerated shipping | Yes, with ice packs | Varies |
| Someone to report a mood change or reaction to | Your care team | Nobody |
Do You Need a Prescription for PE-22-28? Is It Legal to Buy Online?
PE-22-28 and tested sport
The 2026 WADA Prohibited List does not name PE-22-28. Its S0 section, non-approved substances, prohibits at all times "any pharmacological substance which is not addressed by any of the subsequent sections of the List and with no current approval by any governmental regulatory health authority for human therapeutic use." PE-22-28 has no such approval anywhere, so a compounded preparation can fall under S0. A prescription does not change anti-doping rules. Tested athletes should check with their anti-doping organisation before starting. See peptides for athletes.
Do You Need a Prescription for PE-22-28? Is It Legal to Buy Online?
The evidence, in one paragraph
There are no randomised controlled trials of PE-22-28 in humans, and no published human trials of any kind. The 2017 Frontiers in Pharmacology paper reported PE-22-28 reproducing spadin's antidepressant-like effects in mice after a four-day course, with stronger TREK-1 inhibition in cultured cells and a half-life in the mouse of roughly a day. A 2019 Neuropharmacology paper reported sortilin-derived peptides associated with improved recovery in a mouse stroke model. The only human data in the area is observational measurement of the body's own sortilin propeptide in blood, which is not a study of giving PE-22-28 to anyone. Broader context on mood and focus peptides is in peptides for anxiety and mood.
Do You Need a Prescription for PE-22-28? Is It Legal to Buy Online?
What a Pepti PE-22-28 prescription is
| Item | Detail |
|---|---|
| Product | PE-22-28 (Injectable) |
| Vial | 5 mL multi-dose vial, 10 mg PE-22-28 at 2 mg/mL |
| Typical printed directions | Inject 0.25 mL (25 units) subcutaneously once daily Monday through Friday |
| Amount per typical dose | 0.5 mg (0.25 mL at 2 mg/mL, math only) |
| Doses per vial | 20, about four weeks |
| Price | $219 a month all-in: medication, physician review, refill management, refrigerated shipping |
| Pharmacy | PCAB-accredited, FDA-registered US 503A compounding pharmacy |
| Lot results | Lab results |
Your physician sets your directions after reviewing your intake, and they are printed on the vial. The weekday schedule is a prescriber's schedule, not a trial-derived one. Bloodwork is not required for any Pepti treatment. If your physician wants labs for your care, they'll ask through your account.
References
What this is based on.
References
- Djillani A, Pietri M, Moreno S et al.. Shortened Spadin Analogs Display Better TREK-1 Inhibition, In Vivo Stability and Antidepressant Activity · Front Pharmacol (2017) · PMID 28955242
- Mazella J, Pétrault O, Lucas G et al.. Spadin, a sortilin-derived peptide, targeting rodent TREK-1 channels: a new concept in the antidepressant drug design · PLoS Biol (2010) · PMID 20405001
- Heurteaux C, Lucas G, Guy N et al.. Deletion of the background potassium channel TREK-1 results in a depression-resistant phenotype · Nat Neurosci (2006) · PMID 16906152
- Moha Ou Maati H, Veyssiere J, Labbal F et al.. Spadin as a new antidepressant: absence of TREK-1-related side effects · Neuropharmacology (2012) · PMID 21807005
- Devader C, Khayachi A, Veyssière J et al.. In vitro and in vivo regulation of synaptogenesis by the novel antidepressant spadin · Br J Pharmacol (2015) · PMID 25598009
- Moha ou Maati H, Bourcier-Lucas C, Veyssiere J et al.. The peptidic antidepressant spadin interacts with prefrontal 5-HT(4) and mGluR(2) receptors in the control of serotonergic function · Brain Struct Funct (2016) · PMID 25233810
- Ye D, Li Y, Zhang X et al.. TREK1 channel blockade induces an antidepressant-like response synergizing with 5-HT1A receptor signaling · Eur Neuropsychopharmacol (2015) · PMID 26441141
- Hivelin C, Béraud-Dufour S, Devader C et al.. Potentiation of Calcium Influx and Insulin Secretion in Pancreatic Beta Cell by the Specific TREK-1 Blocker Spadin · J Diabetes Res (2016) · PMID 28105440
- Devader C, Roulot M, Moréno S et al.. Serum sortilin-derived propeptides concentrations are decreased in major depressive disorder patients · J Affect Disord (2017) · PMID 27838145
- Roulot M, Minelli A, Bortolomasi M et al.. Increased serum levels of sortilin-derived propeptide after electroconvulsive therapy in treatment-resistant depressed patients · Neuropsychiatr Dis Treat (2018) · PMID 30233189
- Qi X, Xu H, Wang L et al.. Comparison of Therapeutic Effects of TREK1 Blockers and Fluoxetine on Chronic Unpredicted Mild Stress Sensitive Rats · ACS Chem Neurosci (2018) · PMID 29952548
- Djillani A, Pietri M, Mazella J et al.. Fighting against depression with TREK-1 blockers: Past and future. A focus on spadin · Pharmacol Ther (2019) · PMID 30291907
Citations are provided for educational purposes. They do not constitute medical advice. Always discuss any peptide protocol with your prescribing physician.
Common questions
Do You Need a Prescription for PE-22-28? Is It Legal to Buy Online?, answered.
Yes, to obtain it as a medication for your own use. A physician licensed in your state prescribes it and a licensed compounding pharmacy prepares it.
Yes, with a valid prescription filled by a licensed pharmacy. It is not FDA approved, and the FDA has not evaluated it.
Yes, through a telehealth provider whose physician is licensed in your state. Sellers shipping without a prescription sell it as a product not intended for human use.
No. No drug agency has approved it for anything, and compounded medications are not FDA approved. See are peptides FDA approved.
No. It has never been placed in any of the FDA's 503A interim categories, has had no FDA safety notice, and was not on the advisory committee's July 2026 agenda.
Closely related but not identical. Spadin is residues 12 to 28 of the sortilin propeptide; PE-22-28 is the last seven residues of it. Both come from the same French research group and act on the same channel.
Only if the physician who prescribes both says so. The combination has never been studied in people, and no existing antidepressant should be stopped on your own. List every psychiatric medication on the intake.
The 2026 WADA list does not name it, but the S0 non-approved substances section can apply to a compounded peptide with no human therapeutic approval. Check with your anti-doping organisation.
At Pepti, $219 a month all-in for a 5 mL vial at 2 mg/mL, with no membership fee. Pepti is cash-pay and does not bill insurance.
Start with the free assessment. The steps are on the PE-22-28 how-to-get page, and how to judge a provider is in best place to get PE-22-28 online.
In humans, unknown, because no trials have been run. What gets reported clinically is mostly injection-site redness, mild soreness or bruising, and occasionally a headache in the first days. Message your care team about any reaction that is severe or spreading, or any change in mood that worries you or those around you. Call 911 for difficulty breathing. The free assessment goes to a physician licensed in your state. A consultation does not guarantee a prescription.
Next step
See what a physician recommends for you.
A licensed physician in your state reviews your intake and decides what is appropriate. A consultation does not guarantee a prescription.