--- title: "Selank vs Semax: Side-by-Side Comparison (2026)" description: "Compare Selank vs Semax — mechanism, half-life, dose range, side effects, and live vendor pricing. Selank from $25.00. Semax from $32.90. Side-by-side data from" lang: en json-ld: | [ { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://www.bodyhackguide.co/" }, { "@type": "ListItem", "position": 2, "name": "Compare", "item": "https://www.bodyhackguide.co/compare" }, { "@type": "ListItem", "position": 3, "name": "Selank vs Semax" } ] }, { "@context": "https://schema.org", "@type": "WebPage", "name": "Selank vs Semax: Side-by-Side Comparison (2026)", "description": "Compare Selank vs Semax — mechanism, half-life, dose range, side effects, and live vendor pricing. Selank from $25.00. Semax from $32.90. 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Semax is a nootropics that primary mechanism: multi-pathway neurotrophic activation semax produces its effects through coordinated activation of multiple neurotrophic, neurotransmitter, and neuroprotective…. The two differ in mechanism, half-life (~2-3 minutes plasma half-life (functional anxiolytic and nootropic effects persist 12-24 hours due to gene expression and neurotransmitter modulation) vs ~2-3 minutes plasma half-life (functional neurological effects persist 12-24 hours due to BDNF/NGF gene expression changes)), and typical dose range." } }, { "@type": "Question", "name": "Which has the longer half-life, Selank or Semax?", "acceptedAnswer": { "@type": "Answer", "text": "Selank has a half-life of ~2-3 minutes plasma half-life (functional anxiolytic and nootropic effects persist 12-24 hours due to gene expression and neurotransmitter modulation). Semax has a half-life of ~2-3 minutes plasma half-life (functional neurological effects persist 12-24 hours due to BDNF/NGF gene expression changes). Longer half-lives generally mean less frequent dosing but slower on/off kinetics." } }, { "@type": "Question", "name": "Which is cheaper, Selank or Semax?", "acceptedAnswer": { "@type": "Answer", "text": "Current lowest live price on BodyHackGuide: Selank from $25.00, Semax from $32.90. Prices are pulled from the vendor listings tracked on BHG and change frequently — see the compare tables on each compound page for the current set of offers." } }, { "@type": "Question", "name": "Can you stack Selank and Semax?", "acceptedAnswer": { "@type": "Answer", "text": "Stacking depends on mechanism overlap, safety profile, and goals. Selank and 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." } }, { "@type": "Question", "name": "Is selank or semax better for anxiety?", "acceptedAnswer": { "@type": "Answer", "text": "Selank. It's specifically designed as an anxiolytic and modulates GABA + enkephalin pathways without sedation or dependence. Semax can occasionally reduce anxiety as a side effect of its focus-clearing action, but it's primarily a cognitive enhancer — using it for anxiety means you're getting the focus boost as a bonus or downside depending on context." } }, { "@type": "Question", "name": "Can you stack selank and semax?", "acceptedAnswer": { "@type": "Answer", "text": "Yes — common pattern is semax in the morning for focus, selank in the evening for wind-down. Different targets (selank=GABA/enkephalin, semax=BDNF/dopamine) means no receptor overlap. No published interaction issues. Many Russian clinical protocols actually combine them for post-stroke patients with anxiety + cognitive recovery goals." } }, { "@type": "Question", "name": "Is N-acetyl selank better than regular selank?", "acceptedAnswer": { "@type": "Answer", "text": "Same effect, longer half-life. The N-terminal acetylation slows enzymatic breakdown, extending the action from 2-6 hours to 4-8 hours. Practical benefit: 1x/day dosing instead of 2x/day. Cost premium ~30-50% per vial. If you don't mind dosing twice daily, regular selank is more cost-effective. If you want set-and-forget once-daily, N-acetyl is worth it." } }, { "@type": "Question", "name": "How fast does semax work for focus?", "acceptedAnswer": { "@type": "Answer", "text": "15-30 minutes after intranasal dose for peak effect. Subjective focus + mental clarity typically noticeable within 20 minutes, lasts 2-6 hours (N-acetyl semax 4-8 hours). Effect is more like 'clearer thinking' than stimulant edge — no jitter, no crash, no comedown like with caffeine or modafinil." } }, { "@type": "Question", "name": "Are selank and semax legal?", "acceptedAnswer": { "@type": "Answer", "text": "Both are research-use only in the US — not FDA-approved for any indication. Both are prescribed pharmaceuticals in Russia (semax is on Russia's Vital Drug List). Personal import of research-use vials is a gray area; check current US import policy. Neither is WADA-prohibited in competitive sport as of 2026." } } ] } ] --- [Skip to content](#main-content) ## Research Use Only This site is an **educational resource** for research compounds. We do **not endorse** human consumption of any compound. BodyHackGuide and **BHG Labs share common ownership**; we rank every vendor on the same public methodology, and we earn a commission on purchases through our links. By entering, you confirm you are **21 years of age or older** and agree to our [Terms](/terms) & [Privacy Policy](/privacy). I'm 21+ — Enter SiteLeave site [![BodyHackGuide](/assets/bodyhackguide-logo-DOzZNUyh.webp)BodyHackGuide ](/) [Compare](/compare)[Wiki](/wiki)[Vendors](/vendors)[Deals](/deals)[Stacks](/stack-builder)[Nootropics](/nootropics)[Tools](/tools) Learn Community Search ⌘K [Sign In](/auth?returnTo=%2Fcompare%2Fselank-vs-semax) 100K+ researchers trust BodyHackGuide — Join [r/BodyHackGuide](https://reddit.com/r/bodyhackguide) 1. [Home](/) 2. [Compare](/compare) 3. Selank vs Semax # Selank vs Semax Side-by-side comparison of Selank and Semax: mechanism, half-life, dose range, safety profile, and live vendor pricing. Updated continuously as new research and listings land. Selank from $25.00 Semax from $32.90 ## Live price snapshot ### Selank Current low $44.99 as of Sep 5, 2026 7-day low $44.99 30-day low $44.99 30-day change — baseline building ### Semax Current low $74.99 as of Sep 7, 2026 7-day low $44.99 30-day low $44.99 30-day change — baseline building ## Selank Selank is a synthetic heptapeptide (Thr-Lys-Pro-Arg-Pro-Gly-Pro, 750 Da molecular weight) developed in the 1990s at the Institute of Molecular Genetics of the Russian Academy of Sciences as a synthetic analog of tuftsin… **Live lowest price:** $25.00 across 7 vendors [Full Selank profile](/compound/selank) ## Semax Semax is a synthetic heptapeptide (Met-Glu-His-Phe-Pro-Gly-Pro, MEHFPGP, 813 Da molecular weight) developed at the Institute of Molecular Genetics of the Russian Academy of Sciences in the 1980s. The compound is derived… **Live lowest price:** $32.90 across 7 vendors [Full Semax profile](/compound/semax) ## Side-by-side comparison Attribute Selank Semax Category Nootropics Nootropics Research Stage Approved (Russia, as anxiolytic and nootropic medication) Approved (Russia, since mid-1990s for stroke and cognitive disorders) Mechanism of Action Primary Mechanism: Multi-System Neurochemical Modulation Selank does not have a single clean receptor-binding mechanism. Unlike benzodiazepines (GABA-A positive allosteric modulators), SSRIs (serotonin reuptake inhibition), or buspirone (5-HT1A partial… Primary Mechanism: Multi-Pathway Neurotrophic Activation Semax produces its effects through coordinated activation of multiple neurotrophic, neurotransmitter, and neuroprotective pathways. Unlike conventional nootropics that target a single system (modafinil… Half-Life ~2-3 minutes plasma half-life (functional anxiolytic and nootropic effects persist 12-24 hours due to gene expression and neurotransmitter modulation) ~2-3 minutes plasma half-life (functional neurological effects persist 12-24 hours due to BDNF/NGF gene expression changes) Typical Dose Range 250-750 mcg intranasal daily (0.15% solution: 2-3 drops per nostril 2-3x daily); typical course is 14-21 days 100-900 mcg intranasal daily (0.1% solution: 2-3 drops per nostril 2-3x daily); 1% solution used for acute stroke in Russian clinical protocols Dosing Frequency Intranasal 1–3 times daily Intranasal 1–3 times daily Administration Intranasal Intranasal Side Effects Overall Safety Profile Selank has one of the best safety profiles in the anxiolytic space. Over 15+ years of Russian clinical use and research, the compound has been associated with essentially no serious adverse events at therapeutic doses. This compares… Overall Safety Profile Semax has an excellent safety profile across 20+ years of Russian clinical use. In acute stroke trials, cognitive studies, and pediatric applications, Semax has demonstrated consistent tolerability with minimal adverse event burden. This… Molecular Weight 751.9 Da 813.9 Da Common Vial Sizes 5mg, 10mg 5mg, 10mg ## Price History 8 data points - OF - Unknown - VANDL Labs - Unknown - Ion Peptide - BHG Labs - Disguised Alpha ## Price History 8 data points - OF - Unknown - VANDL Labs - Unknown - Ion Peptide - BHG Labs - Disguised Alpha ### Selank — potential benefits - Anxiolytic effects comparable to benzodiazepines but without sedation or dependence in Russian clinical trials (PMID: 18454096) - Positive allosteric modulation of brain GABA receptors through a non-benzodiazepine binding site (PMID: 30255741) - Immunomodulation via Th1/Th2 cytokine balance and IL-6 regulation in patients with anxiety-asthenic disorders (PMID: 18577961) - Cognitive and memory support linked to BDNF upregulation in the hippocampus in preclinical models (PMID: 18841804) - Modulation of the endogenous enkephalin-opioid system supporting mood and stress tolerance (PMID: 22550852) - Anti-inflammatory and adaptogenic effects through normalization of stress-induced cytokine dysregulation - Non-addictive anxiolytic profile - no tolerance, withdrawal, or dependence reported across years of Russian clinical use ### Semax — potential benefits - Rapid BDNF/TrkB upregulation in the hippocampus, supporting synaptic plasticity and learning (PMID: 16996037) - Neuroprotective, immunomodulatory gene-expression changes in focal cerebral ischemia (middle cerebral artery occlusion) models (PMID: 28255762) - Cognitive enhancement including improved attention, working memory, and processing speed - Dopaminergic modulation that may support motivation and executive function (preclinical data) - Stroke recovery facilitation - accelerated functional recovery and improved Barthel Index in ischemic stroke patients; approved in Russia for ischemic stroke (PMID: 29798983) - Anxiolytic and anti-asthenic effects reported in Russian clinical use, attributed to neurotrophic and monoaminergic modulation - Non-addictive cognitive support without tolerance development or withdrawal at standard doses In-depth comparison ## Selank vs Semax: the long answer Selank is an anxiolytic + immunomodulator peptide — calms anxiety, supports mood, no sedation. Semax is a cognitive enhancer — focus, memory, BDNF + dopamine modulation. Both are Russian-developed heptapeptides, intranasally bioavailable, with 25+ years of clinical use in Russia (semax is on their Vital Drug List). Different jobs — pick by goal, or use both on rotation. Last reviewed: May 17, 2026 ### Mechanism — different targets, same form factor Both are derived from the ACTH(4-10) fragment but optimized for different effects. Selank modulates GABA system + enkephalin levels — calming without sedation, anxiolytic without benzodiazepine-class side effects. Semax acts on BDNF expression (rapid + sustained upregulation), dopamine D2/D4 receptors, and acetylcholine pathways — focus, working memory, and neuroprotection. Both are heptapeptides, both work intranasally (peptide that crosses the nasal-CSF axis), both have 15-30 minute onset. - **Selank:** Heptapeptide. GABA + enkephalin modulation. Anxiolytic without sedation. - **Semax:** Heptapeptide. BDNF + dopamine + acetylcholine. Cognitive enhancement. - **Shared properties:** Both intranasal, 15-30 min onset, 2-6 hour duration, Russian clinical heritage ### What each is best for Selank dominates for: generalized anxiety, social anxiety, sleep onset (without next-day grogginess), immune modulation during high-stress periods, alcohol/benzo tapering support (animal data). Semax dominates for: focus work sessions, post-stroke rehabilitation (Russian clinical indication), ADHD-adjacent focus issues, exam-prep cognitive endurance, and BDNF-related neuroplasticity goals. Many users run both: semax in the morning for focus, selank in the evening for wind-down. - **Selank wins on:** Anxiety, social discomfort, sleep onset, stress-period immune support - **Semax wins on:** Focus, working memory, post-stroke recovery, BDNF/neuroplasticity goals - **Common dual-use pattern:** Semax morning (focus), selank evening (wind-down) — different times, no interaction concerns ### Dosing — intranasal sprays, dose per nostril Selank standard protocol: 250-500 mcg per nostril, 1-2x/day (morning and/or before stressful event). Semax: 100-300 mcg per nostril, 1-2x/day. Both work as 1% (semax) or 0.15-0.3% (selank) intranasal solutions — calculate per-spray volume to hit target dose. N-acetyl variants (N-acetyl semax, N-acetyl selank) have extended half-life (3-4x longer) and slightly higher cost — same dose math but 1x/day works for most users. - **Selank dose:** 250-500 mcg per nostril, 1-2x/day. N-acetyl variant: 250-500 mcg 1x/day - **Semax dose:** 100-300 mcg per nostril, 1-2x/day. N-acetyl variant: 100-300 mcg 1x/day - **Onset:** Both: 15-30 min to peak effect, 2-6 hour duration. N-acetyl: 4-8 hour duration. ### Safety — exceptionally clean profile Both have 25+ years of Russian clinical use (selank since 1990s, semax on Russia's Vital Drug List). Reported side effects in Russian clinical literature: mild fatigue (selank, rare), brief headache or sinus irritation from the spray (both, common in week 1, resolves). No published evidence of dependence, tolerance, or withdrawal — significant given how cleanly selank competes with benzodiazepines for the anxiolytic use case. Neither is FDA-approved in the US. - **Selank side effects:** Mild fatigue (uncommon), sinus irritation week 1 (common, resolves). No dependence/tolerance reported. - **Semax side effects:** Brief headache or hyper-focus jitter, sinus irritation. Rare paradoxical fatigue if dosed too late. - **Tolerance / dependence:** Neither has documented tolerance, dependence, or withdrawal in 25+ years of Russian clinical use ### Cost — both inexpensive vs comparable alternatives Research-use selank runs $40-80 for a 10mg vial; at 500 mcg/day that's ~30-50 days of supply = $1-3/day. Research-use semax similar: $40-90/10mg vial, similar daily cost. N-acetyl variants run 30-50% premium for the extended half-life. Compared to off-label modafinil or prescription anxiolytics, both are an order of magnitude cheaper. - **Selank cost:** $40-80/10mg vial → ~$1-3/day at 500 mcg dose - **Semax cost:** $40-90/10mg vial → ~$1-3/day at 300 mcg dose - **N-acetyl premium:** 30-50% more per vial but ~2x duration → similar effective daily cost ### Who chooses which Pick selank if your primary issue is anxiety, racing thoughts, or stress reactivity. Pick semax if your primary issue is focus, mental endurance, or post-injury/stroke cognitive recovery. Pick both if you have anxiety AND focus issues (very common combo): semax morning for execution, selank evening for wind-down. N-acetyl variants are worth the premium if you don't want 2x daily dosing. - **Choose selank if:** Primary issue is anxiety, social discomfort, or stress reactivity - **Choose semax if:** Primary issue is focus, mental endurance, or BDNF/neuroplasticity goals - **Choose both if:** Anxiety + focus issues — semax morning, selank evening, no interaction ## Frequently asked ### What's the difference between Selank and Semax? Selank is a nootropics that primary mechanism: multi-system neurochemical modulation selank does not have a single clean receptor-binding mechanism. unlike benzodiazepines (gaba-a positive allosteric…. Semax is a nootropics that primary mechanism: multi-pathway neurotrophic activation semax produces its effects through coordinated activation of multiple neurotrophic, neurotransmitter, and neuroprotective…. The two differ in mechanism, half-life (~2-3 minutes plasma half-life (functional anxiolytic and nootropic effects persist 12-24 hours due to gene expression and neurotransmitter modulation) vs ~2-3 minutes plasma half-life (functional neurological effects persist 12-24 hours due to BDNF/NGF gene expression changes)), and typical dose range. ### Which has the longer half-life, Selank or Semax? Selank has a half-life of ~2-3 minutes plasma half-life (functional anxiolytic and nootropic effects persist 12-24 hours due to gene expression and neurotransmitter modulation). Semax has a half-life of ~2-3 minutes plasma half-life (functional neurological effects persist 12-24 hours due to BDNF/NGF gene expression changes). Longer half-lives generally mean less frequent dosing but slower on/off kinetics. ### Which is cheaper, Selank or Semax? Current lowest live price on BodyHackGuide: Selank from $25.00, Semax from $32.90. Prices are pulled from the vendor listings tracked on BHG and change frequently — see the compare tables on each compound page for the current set of offers. ### Can you stack Selank and Semax? Stacking depends on mechanism overlap, safety profile, and goals. Selank and 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. ### Is selank or semax better for anxiety? Selank. It's specifically designed as an anxiolytic and modulates GABA + enkephalin pathways without sedation or dependence. Semax can occasionally reduce anxiety as a side effect of its focus-clearing action, but it's primarily a cognitive enhancer — using it for anxiety means you're getting the focus boost as a bonus or downside depending on context. ### Can you stack selank and semax? Yes — common pattern is semax in the morning for focus, selank in the evening for wind-down. Different targets (selank=GABA/enkephalin, semax=BDNF/dopamine) means no receptor overlap. No published interaction issues. Many Russian clinical protocols actually combine them for post-stroke patients with anxiety + cognitive recovery goals. ### Is N-acetyl selank better than regular selank? Same effect, longer half-life. The N-terminal acetylation slows enzymatic breakdown, extending the action from 2-6 hours to 4-8 hours. Practical benefit: 1x/day dosing instead of 2x/day. Cost premium ~30-50% per vial. If you don't mind dosing twice daily, regular selank is more cost-effective. If you want set-and-forget once-daily, N-acetyl is worth it. ### How fast does semax work for focus? 15-30 minutes after intranasal dose for peak effect. Subjective focus + mental clarity typically noticeable within 20 minutes, lasts 2-6 hours (N-acetyl semax 4-8 hours). Effect is more like 'clearer thinking' than stimulant edge — no jitter, no crash, no comedown like with caffeine or modafinil. ### Are selank and semax legal? Both are research-use only in the US — not FDA-approved for any indication. Both are prescribed pharmaceuticals in Russia (semax is on Russia's Vital Drug List). Personal import of research-use vials is a gray area; check current US import policy. Neither is WADA-prohibited in competitive sport as of 2026. ## See current vendor prices Live listings from the vendors we track, refreshed continuously. [Selank prices](/compound/selank?tab=prices) [Semax prices](/compound/semax?tab=prices) [Compare all compounds](/compare) ### Before you buy Selank or 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 including BHG Labs, which shares our ownership. [View Vendor Scorecard](/vendors/scorecard) ## Related comparisons [Selank vs Phenibut](/compare/selank-vs-phenibut)[N Acetyl Selank vs N Acetyl Semax](/compare/n-acetyl-selank-vs-n-acetyl-semax)[Noopept vs Piracetam](/compare/noopept-vs-piracetam)[Phenylpiracetam vs Piracetam](/compare/phenylpiracetam-vs-piracetam)[Modafinil vs Phenylpiracetam](/compare/modafinil-vs-phenylpiracetam)[Bromantane vs Modafinil](/compare/bromantane-vs-modafinil)[Dihexa vs Noopept](/compare/dihexa-vs-noopept) **Research use only.** BodyHackGuide is a research and price-comparison reference. BodyHackGuide and BHG Labs share common ownership. 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. We earn an affiliate commission on some outbound clicks, and every vendor is ranked on the same public, reproducible methodology. 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