Doubly modified ACTH(4-7) analogue heptapeptide with potent nootropic, neuroprotective, and neurotrophic properties acting through BDNF/NGF upregulation and transcriptome-level modulation of inflammatory and neurotransmitter gene networks
Written by Michael Carroll — Owner, Director of Research · Reviewed by the Peptide Initiative Research Team · Editorial standards
Intranasal spray
Route
3 recommended
Sites
Once daily
Frequency
Preparation
N-Acetyl Semax Amidate vial (lyophilized powder or solution)
Bacteriostatic water or sterile sodium chloride for reconstitution
Alcohol swabs for cleaning vial tops and injection sites
Appropriately sized syringes with fine-gauge needles (27-30 gauge)
Sharps disposal container
Pro tip
Prepare all supplies on a clean surface before you begin. Having everything ready makes the process smoother and more sterile.
Mixing
Wash your hands thoroughly with soap and water. Gather all supplies on a clean, flat surface.
Remove the plastic cap from the peptide vial and wipe the rubber stopper with an alcohol swab. Let it air dry.
Draw the appropriate amount of bacteriostatic water into a sterile syringe.
Insert the needle into the vial at an angle, aiming at the inside wall of the vial. Slowly push the plunger to let the water trickle down the glass wall -- do NOT squirt directly onto the powder.
Once all water is added, gently swirl the vial in a slow circular motion. Never shake the vial, as this can damage the peptide bonds.
Continue swirling until the powder is completely dissolved and the solution is clear. If particles remain, let the vial sit for a few minutes and swirl again.
Label the vial with the date of reconstitution, the peptide name, and the concentration (e.g. 250mcg per 0.1mL).
Example calculation
Add the recommended volume of bacteriostatic water to the N-Acetyl Semax Amidate vial. Gently swirl (do not shake) until the powder is fully dissolved. The resulting solution should be clear. Calculate your individual dose based on the concentration and your prescribed amount.
Dose calculation
Your dose of N-Acetyl Semax Amidate is determined by your healthcare provider. Using an insulin syringe marked in units, draw up the exact amount prescribed. For example, if the reconstituted concentration is 1mg/mL and your dose is 0.5mg, draw up 0.5mL (50 units on an insulin syringe). Always double-check calculations before injection.
Pro tip
Always add the bacteriostatic water slowly, letting it run down the side of the vial. Never shake the vial -- swirl gently to avoid damaging the peptide.
Location
Site 01
Abdomen
Pinch the skin 2 inches from navel. Avoid the area directly around the belly button. Rotate between left and right sides.
Site 02
Outer Thigh
Middle third of the outer thigh. Keep at least 4 inches above the knee and below the hip. Alternate legs each injection.
Site 03
Upper Arm
Back or outer area of the upper arm. This site may require assistance from another person for proper technique.
Rotate between 3 sites to prevent tissue buildup and ensure consistent absorption.
Pro tip
Rotate your injection sites with each dose to prevent lipohypertrophy (buildup of fatty tissue). Keep a simple log of where you last injected.
Step by step
Wash your hands thoroughly with soap and water before handling supplies
Clean the injection site with an alcohol swab and let it air dry completely
Pinch a fold of skin at the chosen injection site
Insert the needle at a 45-90 degree angle (depending on needle length and body composition)
Inject the medication slowly and steadily over 5-10 seconds
Release the skin fold and remove the needle, applying gentle pressure with a clean swab
Rotate injection sites to prevent tissue irritation or lipodystrophy
Dispose of the needle safely in a sharps container—never recap or reuse needles
Pro tip
This peptide uses subcutaneous injection (into the fatty tissue just under the skin)—allows for consistent absorption and can be self-administered at home after proper training. Inject at a 45-90 degree angle into pinched skin. Aspirate before injecting to ensure you haven't hit a blood vessel.
Timing
Optimal timing
Best time
Administer N-Acetyl Semax Amidate nasal spray at the same time each day. Morning dosing is commonly preferred. Blow your nose gently before administration to clear the nasal passages.
With food?
N-Acetyl Semax Amidate nasal administration is not significantly affected by food. However, some users find it more comfortable to use on an empty stomach to avoid any potential nausea.
Stacking notes
N-Acetyl Semax Amidate should be used as directed by your healthcare provider. If combining with other medications or supplements, discuss potential interactions with your provider. Avoid combining with compounds that have overlapping mechanisms unless specifically guided by a medical professional.
Sample daily schedule
As prescribed (once daily)
As prescribed by your healthcare provider injection
Site: Intranasal spray—rotate sites if applicable
Maintain a consistent schedule for optimal results with N-Acetyl Semax Amidate. Set reminders if needed. If you miss a dose, follow your healthcare provider's instructions—do not double up on doses to compensate.
Dosing tiers
Dose
200-300 mcg/day
Frequency
Divided 2-3 times daily
Duration
2-4 weeks
Lower cognitive-use range with the 0.1% intranasal solution; Russian clinical protocols [6].
Preservation
Before mixing
Store N-Acetyl Semax Amidate in the refrigerator at 36-46°F (2-8°C) in its original packaging. Protect from light and moisture. Do not freeze. Check the expiration date before use. Some formulations may be stored at room temperature for limited periods—check your specific product labeling.
After mixing
Once reconstituted, N-Acetyl Semax Amidate should be kept refrigerated at 36-46°F (2-8°C) and used within the timeframe specified on your product labeling (typically 14-28 days). Label the vial with the reconstitution date. Do not use if the solution appears cloudy, discolored, or contains particles.
Shelf life after mixing
14-21 days refrigerated
Signs of degradation
Discard the vial immediately if you notice any of these:
Solution appears cloudy, discolored, or contains visible particles (should be clear)
Product has been exposed to temperatures outside the recommended storage range
Product has been frozen (unless specifically designed for freeze-thaw stability)
Expiration date has passed or reconstituted solution has exceeded its use-by date
Unusual odor, color change, or visible contamination
Important
When to stop
Severe or worsening side effects that don't improve with dose adjustment or supportive care
Signs of an allergic reaction—rash, hives, swelling, or difficulty breathing
Your healthcare provider recommends discontinuation based on your clinical response
Development of any new medical condition that may be contraindicated with N-Acetyl Semax Amidate
Pregnancy or planning to become pregnant (unless specifically approved for use during pregnancy)
Abnormal lab results or clinical markers that suggest adverse effects
N-Acetyl Semax Amidate should only be started, adjusted, or discontinued under medical supervision. This information is for educational purposes only and does not replace professional medical advice. Never stop a prescribed treatment without consulting your healthcare provider first, as abrupt discontinuation may have consequences.
Clean technique checklist
Wash hands thoroughly with soap and water before handling supplies
Swab vial tops and injection site with alcohol and let dry
Never touch the needle tip or allow it to contact non-sterile surfaces
Use a new syringe and needle for each injection
Dispose of used sharps in a proper sharps container
Store reconstituted peptides according to the storage instructions above
Published research
Dolotov OV, Karpenko EA, Seredenina TS · 2006
Semax finds and locks onto very specific brain receptors with extraordinary precision, triggering a flood of BDNF—the brain growth chemical—within just 3 hours of a simple nasal spray. This direct molecular handshake explains why cognitive effects happen so quickly and strongly, with BDNF levels climbing just from the peptide finding its target sites.
Filippenkov IB, Stavchansky VV, Denisova AE · 2020
When a rat's brain lost blood flow, Semax rewrote the damage at the genetic level—flipping a switch that silenced harmful inflammatory genes while powering up genes for brain chemicals and cell survival. Out of nearly 400 genes affected, Semax created an almost perfect opposite pattern to the damage, essentially teaching the brain to repair itself.
Sudarkina OY, Filippenkov IB, Stavchansky VV · 2021
While the genetic changes reveal Semax's master plan, the actual brain proteins tell the real story: Semax cranks up the protective CREB protein while slamming the brakes on three dangerous inflammation proteins that kill brain cells. This dual action—boost healing, block damage—explains why brains recover so much better with Semax than without it.
Gusev EI, Martynov MY, Kostenko EV · 2018
In 110 actual stroke patients, Semax didn't just help—it made recovery noticeably faster and stronger, with healing markers climbing and staying elevated even when rehab timing varied. The boost to BDNF persisted throughout treatment, and patients showed measurable improvements in movement and daily-life function that were clearly linked to the peptide's brain-protective effects.
Stavchansky VV, Tvorogova TV, Botsina AIu · 2011
When a rat's brain couldn't get enough blood, Semax rebooted the entire growth-factor system by restoring three different brain-building chemicals (BDNF, NGF, and NT-3) and all their docking sites—turning the memory center from a dying zone into one programmed for recovery. The whole system came back online within 12 hours, creating a perfect window for brain healing.
Ashmarin IP, Nezavibatko VN, Myasoedov NF, et al. · 1997
Russian review of Semax (ACTH 4-10 analog) as a nootropic. Intranasal administration at roughly 0.015-0.050 mg/kg stimulated operative memory and attention in humans, with effects persisting ~20-24 hours and no documented adverse reactions. Supports the cognitive-enhancement use described in Russian clinical practice (not a Western regulatory-approved indication).
Head to head