--- title: "Modafinil vs N-Acetyl-Semax: Side-by-Side Comparison (2026)" url: https://www.bodyhackguide.co/compare/modafinil-vs-n-acetyl-semax description: "Compare Modafinil vs N-Acetyl-Semax side by side. We earn a commission on some vendor links. Mechanism, half-life, dose range, side effects and prices." lang: en --- Skip to content Compare notes on r/BodyHackGuide (https://reddit.com/r/bodyhackguide) Compare notes with other researchers. Join r/BodyHackGuide (https://reddit.com/r/bodyhackguide) # Modafinil vs N-Acetyl-Semax Side-by-side comparison of Modafinil and N-Acetyl-Semax: mechanism, half-life, dose range, safety profile, and vendor pricing. Modafinil: no price on file N-Acetyl-Semax: no price on file ## Price snapshot ### Modafinil Current low — 7-day low — not enough history yet 30-day low — not enough history yet 30-day change — not enough history yet ### N-Acetyl-Semax Current low — 7-day low — not enough history yet 30-day low — not enough history yet 30-day change — not enough history yet ## Modafinil Modafinil is a prescription wakefulness-promoting agent approved by the US Food and Drug Administration in December 1998 under the brand name Provigil (Cephalon, now Teva) for the treatment of excessive daytime… No vendor price on file. Full Modafinil profile (https://www.bodyhackguide.co/compound/modafinil) ## N-Acetyl-Semax This is a duplicate/alias entry. The full, maintained guide for this compound lives at NA-Semax (/compound/na-semax). See that page for mechanism, dosing, evidence, and safety. No vendor price on file. Full N-Acetyl-Semax profile (https://www.bodyhackguide.co/compound/n-acetyl-semax) ## Side-by-side comparison | Attribute | Modafinil | N-Acetyl-Semax | | --- | --- | --- | | Category | Nootropics | Cognitive | | Research Stage | Preclinical | Duplicate entry - see NA-Semax | | Mechanism of Action | Modafinil's mechanism of action is genuinely incompletely understood despite more than two decades of clinical use and extensive preclinical research. It is not a classical stimulant — it does not produce the catecholamine surge of amphetamines, the direct… | See the full guide This page is a duplicate of NA-Semax, which is the canonical, maintained entry. To avoid conflicting or outdated information, all detail - mechanism of action, protocols, dosing, side effects, and verified citations - is kept on that single… | | Half-Life | — | — | | Typical Dose Range | — | — | | Dosing Frequency | — | — | | Administration | — | — | | Side Effects | Modafinil's side effect profile is relatively favorable compared to classical stimulants but is not negligible. The most common side effects, reported in 5-10% or more of users in clinical trials, are headache (dose-related, typically transient but… | — | | Molecular Weight | — | — | | Common Vial Sizes | — | — | ### Modafinil: potential benefits - No structured benefit list published. ### N-Acetyl-Semax: potential benefits - See the full guide at NA-Semax (/compound/na-semax) for benefits and evidence. ## Frequently asked ### What's the difference between Modafinil and N-Acetyl-Semax? Modafinil is a nootropics that modafinil's mechanism of action is genuinely incompletely understood despite more than two decades of clinical use and extensive preclinical research. it is not a classical…. N-Acetyl-Semax is a cognitive that see the full guide this page is a duplicate of na-semax, which is the canonical, maintained entry. to avoid conflicting or outdated information, all detail - mechanism of action,…. The two differ in mechanism, half-life (not reported vs not reported), and typical dose range. ### Which has the longer half-life, Modafinil or N-Acetyl-Semax? Modafinil has a half-life of not reported. N-Acetyl-Semax has a half-life of not reported. Longer half-lives generally mean less frequent dosing but slower on/off kinetics. ### Can you stack Modafinil and N-Acetyl-Semax? Stacking depends on mechanism overlap, safety profile, and goals. Modafinil and N-Acetyl-Semax should only be stacked after reviewing each compound's individual protocol page, side effect profile, and any published interaction data. Use the BodyHackGuide stack builder for a structured review before combining research compounds. ## See current vendor prices Listings from the vendors we track. Prices change often, so check the vendor before you buy. Modafinil prices: https://www.bodyhackguide.co/compound/modafinil?tab=prices N-Acetyl-Semax prices: https://www.bodyhackguide.co/compound/n-acetyl-semax?tab=prices Compare all compounds: https://www.bodyhackguide.co/compare ### Before you buy Modafinil or N-Acetyl-Semax Check the vendor trust score. Every supplier we track is rated 0-100 on COA verification, payment transparency, shipping, reviews, and listings: one published, reproducible methodology, applied to every vendor. View Vendor Scorecard (https://www.bodyhackguide.co/vendors/scorecard) ## Related comparisons N Acetyl Selank vs N Acetyl Semax: https://www.bodyhackguide.co/compare/n-acetyl-selank-vs-n-acetyl-semax Modafinil vs Phenylpiracetam: https://www.bodyhackguide.co/compare/modafinil-vs-phenylpiracetam Bromantane vs Modafinil: https://www.bodyhackguide.co/compare/bromantane-vs-modafinil **Research use only.** BodyHackGuide is a research and price-comparison reference. The compounds discussed on this page are not approved by the FDA for human consumption and are sold strictly for laboratory research. Prices shown are pulled from vendor listings tracked on BHG and are subject to change. Every vendor is ranked on the same public, reproducible methodology. See editorial standards (https://www.bodyhackguide.co/editorial-standards) and affiliate disclosure (https://www.bodyhackguide.co/affiliate-disclosure). 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