Methylene Blue vs Semax
Side-by-side comparison of Methylene Blue and Semax: mechanism, half-life, dose range, safety profile, and vendor pricing.
Price snapshot
Methylene Blue
Semax
Methylene Blue
Methylene blue (methylthioninium chloride) is a phenothiazine dye with a 150-year pharmacology record. It was the first fully synthetic drug ever used in medicine (Ehrlich, 1891 for malaria) and remains on the WHO Model…
Lowest listed price: $19.99 across 3 listings
Full Methylene Blue profileSemax
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…
Lowest listed price: $32.90 across 5 listings
Full Semax profileSide-by-side comparison
| Attribute | Methylene Blue | Semax |
|---|---|---|
| Category | Nootropics | Nootropics |
| Research Stage | Approved medicine: injection for acquired methemoglobinemia (US and EU) and, in the EU, an oral dye tablet for colonoscopy (Lumeblue); no cognitive or performance use is approved | Approved in Russia; registered as a prescription intranasal solution |
| Mechanism of Action | Methylene blue (MB) has a multi-target redox mechanism that explains why it appears in such disparate indications as malaria, methemoglobinemia, septic shock, vasoplegia, Alzheimer's (TRx0237), and cognitive enhancement: 1. Alternative mitochondrial electron… | 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 neurological effects persist 12-24 hours due to BDNF/NGF gene expression changes) |
| Typical Dose Range | 0.5 mg - 4 mg/kg daily (oral) | 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 |
| Administration | — | Intranasal |
| Side Effects | Expected / benign - Blue-green urine and stool — universal, not a problem, clears within 24-48 hours of last dose. - Blue discoloration of sclera and skin at sustained higher doses; reversible. - Metallic taste and mild mucosal tingling at oral doses 30 mg. -… | 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 | 319.85 g/mol | 813.9 Da |
| Common Vial Sizes | — | 5mg, 10mg |
Price History
3 data points- Half Nattys
- Ion Peptide
- Disguised Alpha
Price History
5 data points- OF
- Half Nattys
- Ion Peptide
- BHG Labs
Methylene Blue: potential benefits
- Mitochondrial electron transport bypass (Complex I/III)
- Cytochrome c oxidase activation (+30-70%)
- Memory consolidation and retrieval
- Sustained attention and processing speed
- Antioxidant recycling of ascorbate and glutathione
- Tau aggregation inhibition (Alzheimer's-relevant)
- FDA-indicated treatment for methemoglobinemia
- Adjunct for vasoplegic shock (off-label)
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
Frequently asked
What's the difference between Methylene Blue and Semax?
Methylene Blue is a nootropics that methylene blue (mb) has a multi-target redox mechanism that explains why it appears in such disparate indications as malaria, methemoglobinemia, septic shock, vasoplegia,…. 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 (not reported 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, Methylene Blue or Semax?
Methylene Blue has a half-life of not reported. 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, Methylene Blue or Semax?
Lowest listed price on BodyHackGuide: Methylene Blue from $19.99, 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 Methylene Blue and Semax?
Stacking depends on mechanism overlap, safety profile, and goals. Methylene Blue 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.
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Related comparisons
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 and affiliate disclosure.