Semax
ACTH(4-10) analog
- Injection
- Oral
- Nasal spray
- Suppository
- Gel or cream
Injection · Nasal spray — daily, over four to six weeks.
Available — priced per vial or unit, not by the month
Semax is a synthetic peptide built from seven amino acids. Russian neuropharmacologists designed it in the late 1980s by taking the active core of adrenocorticotropic hormone (ACTH) and adding a tail that slows enzymatic breakdown. The design choice mattered: they kept the part of ACTH that talks to the central nervous system and engineered out the part that triggers cortisol release.
The result is a neuropeptide that works through brain-derived neurotrophic factor (BDNF) and nerve growth factor (NGF). In animal models, a single intranasal dose upregulates Bdnf and Ngf gene expression in the hippocampus and frontal cortex within minutes. BDNF supports neuronal survival and synaptic plasticity — the slow structural change that underpins learning and recovery. Semax also modulates serotonin and dopamine pathways, acting as a regulator rather than a direct stimulant.
“Semax is what happens when you take a stress hormone, strip out the stress, and keep the part that helps the brain adapt.”
The molecule is a registered prescription drug in Russia, used primarily for stroke recovery and cognitive disorders, and Russian stroke trials with it go back to 1997. Outside Russia, it has no approved indication anywhere. The FDA has never evaluated it. That asymmetry — nearly three decades of clinical use on one side of a border and zero regulatory engagement on the other — is the central fact every researcher needs to hold in mind. The deep-dive on our hub site walks through the full Russian clinical literature, the BDNF mechanism, and the regulatory gap.
Who it's for (or who should avoid)
What it's aimed at
Semax protocols are most commonly prescribed for:
- Cognitive support — focus, working memory, and mental clarity during demanding work or study periods
- Stroke recovery — used in Russian neurology for acute ischemic stroke and transient ischemic attack
- Neuroprotection — compounded use for conditions where BDNF upregulation and anti-inflammatory effects may support brain health
- Mood regulation — some users report reduced stress reactivity and improved emotional stability
- Post-concussion recovery — early research suggests potential for traumatic brain injury support
Who should avoid it
- Anyone with diabetes — some reports suggest Semax may elevate blood glucose; monitoring is essential
- People with active psychiatric conditions or on psychoactive medications — serotonergic and dopaminergic modulation requires careful discussion
- Anyone with adrenal or pituitary pathology — theoretical concerns given the ACTH lineage, even though Semax is engineered to lack steroidogenic activity
- Anyone pregnant, breastfeeding, or planning a pregnancy — no controlled human data
- People with seizure disorders — caution advised given the neurochemical effects
Human use of Semax comes almost entirely from Russian stroke clinics, where it was given for five to ten days alongside standard care, at several times the dose the Russian label gives for memory problems. Those studies looked at recovery after a stroke, not at what a healthy person might feel. The Alzheimer’s Drug Discovery Foundation reviewed it for cognitive enhancement and found the evidence insufficient to recommend. The longest human exposure anyone has published is weeks — which is also why nobody can tell you what a month-by-month schedule looks like.
Route, dose and course
Semax is most commonly prescribed as an intranasal spray. The olfactory nerve provides a partial bypass around the blood-brain barrier, allowing the peptide to reach the central nervous system without first being degraded by liver enzymes. This is the route Russian clinical protocols use and the route the BDNF data come from.
Subcutaneous injection is used in some research and clinical settings, particularly where consistent systemic exposure matters more than peak CNS concentration. The peptide reaches the brain, but the route is less efficient for CNS-specific effects.
What sellers and studies publish (we checked on 16 October 2026):
- What sellers publish (checked 16 October 2026): Rx Peps Direct lists a nasal spray at 250 mcg per spray and does not say how many sprays a day. No dose is approved for Semax in the US
- Cycling: none of the sellers we checked publishes one; continuous long-term dosing is unstudied
- Stacking: Rx Peps Direct sells a Semax and Selank nasal spray in one bottle
Dosing is something to set with your
No measured timeline
No human trial has measured how soon Semax works or how long any effect lasts, and we found no source we trust for a week-by-week picture, so we do not draw one. Agree with your prescriber what you will measure and when you will check it.
Available — priced per vial or unit, not by the month
No seller here prices it by the month. Each figure is what the seller publishes, in its own unit — a vial, a spray or a capsule — with the exclusion spelled out. How long a unit lasts depends on the dose a prescriber sets.
| Provider | Published price | What that figure excludes | Coverage | Their own site |
|---|---|---|---|---|
| PeRxPeptide-only telehealth, Wellness MD Group PC | No price for this compound | The only peptide figure on the site is a floor for the whole menu — treatment plans "starting at $199" — so there is no price for any individual compound. The provider review is included; there is no separate consultation fee. | All 50, stated | Go to site |
| RxPepsDirectPer-vial prices, 503A pharmacy in Texas | $125 per 15 ml sprayread 2026-11-04 | The $39 telehealth visit, charged per order. | A named list | Go to site |
Will it work where you live?
Most sellers claim all fifty states or publish nothing about coverage; a few name the states they serve or the ones they exclude, and the Coverage column says which. Either way it is the seller's own claim, so we can't filter this list by state without inventing a fact. What we can tell you is which state-level rules decide access: telehealth rules, non-resident pharmacy licensing, and who is allowed to prescribe.
Prices and providers change. We keep track.
Questions we get about Semax
Is Semax FDA-approved?
No — Semax is a registered prescription drug in Russia for stroke recovery and cognitive disorders, but it has never been evaluated or approved by the FDA. In the US there is no approved label for it to be prescribed off; licensed clinicians prescribe it and compounding pharmacies prepare it. Its compounding status moved in July 2026: the FDA told its Pharmacy Compounding Advisory Committee that Semax should not go on the 503A list, and on July 24 the committee voted 8–5–1 the other way, recommending it for cerebral ischemia, migraine and trigeminal neuralgia. That is a recommendation, not a rule — the FDA still has to write one — so confirm current availability with your provider.
Is it legal?
Semax is not a controlled substance, so possession isn't illegal. Compounding it on a prescription is now tolerated, under conditions, though it is still on no list that authorises it. Section 503A lets a pharmacy compound only from an ingredient of an FDA-approved drug, a substance with a USP monograph or one on the FDA's 503A bulks list, and Semax is none of these. On October 28, 2026, HHS said it will not take action against State-licensed pharmacies and licensed physicians that compound Semax for a named patient while the FDA decides whether to list it. The conditions: Semax is the only active ingredient, the route is intranasal use only, the bulk substance comes from an FDA-registered manufacturer named on a certificate of analysis, and serious side effects are reported to the FDA. HHS can withdraw the policy. A blend that mixes Semax with other peptides is outside it, and buying from "research chemical" sellers without a prescription is still not a lawful supply route for human use. Since November 2, 2026, LegitScript, the certifier whose seal many telehealth sites show, no longer refuses certification to sellers whose Semax meets these conditions; that seal is not FDA approval.
Are there side effects?
The most common side effect is nasal irritation: burning, congestion, or mild discoloration of the nasal mucosa. Some users report transient headache, mild fatigue, or insomnia if dosed too late in the day. Diabetic patients should monitor blood glucose, as some reports suggest Semax may elevate levels. Long-term safety data beyond a few weeks are limited.
Can I take it with my current medications?
Semax modulates serotonin and dopamine pathways, so anyone on antidepressants, stimulants, or other psychoactive medications should discuss it with their provider. Beyond that, there is little to report and that is the problem: the longest published human exposure is weeks, there is no Western pharmacovigilance, and Semax is not FDA-regulated, so it accumulates no adverse-event record here. Full disclosure of your medication list is essential.
How much does it cost?
The sellers in the price table on this page price it per vial or unit rather than by the month, each with the date we read it. It is compounded to order, and it is one of the seven peptides an FDA advisory committee recommended for the compounding list in July 2026; the FDA has not acted on that recommendation. A spray bottle is not a month: how long it lasts depends on the dose prescribed. The two formulations, standard Semax and N-Acetyl Semax Amidate, are not interchangeable and do not price alike, so make sure a quote says which one it is for. Insurance does not cover compounded medications.
How the bill breaks downWe publish no medical reviewer by design. Every claim on this page traces to a source we hold on file, and the reviewed write-up with those citations lives on our hub. Read the full research on PeptideWellness ↗
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