N-Acetyl Semax Amidate
N-Acetyl-Met-Glu-His-Phe-Pro-Gly-Pro-NH2
N-Acetyl Semax Amidate Explained
N-Acetyl Semax Amidate, or NASHA, is a tweaked version of a brain-supporting peptide that people use when they want sharper thinking and better cognitive function. Think of it like a software update—same purpose, much better performance.
Here's what makes it special: scientists added two small chemical modifications to the original peptide. One modification acts like a protective shield on one end, and another on the other end. Your body naturally has cleanup crews called enzymes that break down peptides quickly, usually within minutes. These modifications are like giving your peptide a invisibility cloak against those cleanup crews, so it lasts in your system much longer—potentially hours instead of minutes.
Because it sticks around longer and gets protected better, NASHA is roughly a thousand times more potent than its predecessor. That means your body gets the same brain-boosting effects from a tiny fraction of the dose. When NASHA reaches your brain, it tells your cells to produce more growth factors—basically nutritional signals that help brain cells stay healthy and communicate better. It also fine-tunes your dopamine and serotonin systems, the chemicals that drive focus and mood. The tradeoff is that because such small doses work, measuring and taking it accurately becomes trickier.
Dosage Information
Typical Dose
25-100 mcg per dose
Frequency
Once daily
Administration
Intranasal spray or subcutaneous injection
Half-Life
10–15 minutes
estimatedNotes
Significantly more potent than standard Semax — start at the lowest dose. Due to increased potency effects may be felt for 8-12 hours. Avoid late afternoon dosing to prevent sleep disruption.
Why this matters
Acetyl and amide modifications extend activity vs standard Semax; still requires frequent dosing.
Protocol cycle
Dose Calculator
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Where does N-Acetyl Semax Amidate sit?
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Evidence Score
0.11
Compound Data
Molecular Formula
C39H54N10O10S
Molecular Weight
855.00 g/mol
IUPAC Name
(4S)-4-[[(2S)-2-acetamido-4-methylsulfanylbutanoyl]amino]-5-[[(2S)-1-[[(2S)-1-[(2S)-2-[[2-[(2S)-2-carbamoylpyrrolidin-1-yl]-2-oxoethyl]carbamoyl]pyrrolidin-1-yl]-1-oxo-3-phenylpropan-2-yl]amino]-3-(1H-imidazol-5-yl)-1-oxopropan-2-yl]amino]-5-oxopentanoic acid
PubChem CID
172638603Potential Side Effects
N-Acetyl Semax Amidate discussions
Quick Facts
- Administration
- Intranasal spray or subcutaneous injection
- Typical Dose
- 25-100 mcg per dose
- Frequency
- Once daily
- References
- 0 curated + 0 from PubMed
- Evidence Score
- 0.1 / 100
Frequently Asked Questions about N-Acetyl Semax Amidate
What is N-Acetyl Semax Amidate?
N-Acetyl Semax Amidate (NASHA) is a modified version of Semax with an acetyl group added to the N-terminus and amidation at the C-terminus. These modifications significantly increase potency and duration of action compared to standard Semax making NASHA approximately 1000 times more potent by weight. It is considered by many in the nootropic research community to be the superior form of Semax offering the same cognitive and neuroprotective benefits at much lower doses with longer lasting effects.
How does N-Acetyl Semax Amidate work?
NASHA shares Semax's core mechanism — BDNF and NGF upregulation dopaminergic and serotonergic modulation and neuroprotection — but the chemical modifications dramatically alter its pharmacokinetics. The N-acetyl modification protects the peptide from aminopeptidase degradation while the C-terminal amidation protects from carboxypeptidase breakdown. Together these modifications extend the peptide's half-life from minutes to potentially hours and improve blood-brain barrier penetration. The increased potency means effective doses are in the 25-50 mcg range rather than the 200-900 mcg range required for standard Semax making accurate dosing more challenging but also making the compound more economical per effective dose.
What is the recommended dosage for N-Acetyl Semax Amidate?
The typical dose is 25-100 mcg per dose. Once daily. Administration: Intranasal spray or subcutaneous injection. Significantly more potent than standard Semax — start at the lowest dose. Due to increased potency effects may be felt for 8-12 hours. Avoid late afternoon dosing to prevent sleep disruption.
What are the side effects of N-Acetyl Semax Amidate?
Nasal irritation (common). Anxiety or overstimulation at higher doses (uncommon). Insomnia if dosed late in day (uncommon). Headache (rare)
What is the N-Acetyl Semax Amidate cycle protocol?
N-Acetyl Semax Amidate is typically cycled as needed.
Questions reflect common community inquiries. This is not medical advice.