PinnyPeptide

Cortagen vs Semax

Side-by-side comparison: effects, dosing ranges, side effects, regulatory status, and reconstitution.

Peptide A

Cortagen

Bioregulators

Khavinson short peptide bioregulator targeting cortical neurons and CNS gene expression.

Peptide B

Semax

Cognitive

Neuroprotective ACTH analog with nootropic and neurotrophic properties.

Typical vial

20 mg

Typical dose

1,000-5,000 mcg

Half-life

Short (minutes); biological effect persists via gene-expression modulation

FDA status

Not FDA approved.

Typical vial

5 mg

Typical dose

200-600 mcg

Half-life

~2-3 minutes (very rapid degradation; biological effects last hours due to downstream gene expression changes)

FDA status

Not FDA approved for human use. Approved in Russia for strok…

Cortagen effects

  • Reported support of cortical neuron function and gene expression
  • Improvements in memory and attention (Russian observational)
  • Neuroprotection in cerebral ischemia models
  • Possible support for post-stroke and post-concussive recovery
  • Modulation of neuroplasticity-related gene expression

Semax effects

  • Upregulates BDNF and NGF expression for neuroprotection
  • Enhances memory formation, learning, and attention
  • Promotes neuronal survival after ischemic injury
  • Modulates serotonergic and dopaminergic neurotransmission
  • Supports optic nerve health and visual function

Cortagen side effects

  • Generally well-tolerated in Russian clinical use
  • Mild injection-site reactions
  • Limited Western safety validation
  • Possible mild sleep disturbance with late-day dosing

Semax side effects

  • Mild nasal irritation with intranasal administration
  • Occasional headache
  • Rare anecdotal reports of hair thinning at high doses
  • Mild dizziness in sensitive individuals

Cortagen dosing ranges

Cognitive support

1-5 mg · Once daily morning (SubQ) or intranasal · 10-20 day cycles, repeated 2-3 times per year

Semax dosing ranges

Cognitive enhancement

200-600 mcg · Once or twice daily (intranasal) · 10-20 days per course

Neuroprotection / stroke recovery

600-1200 mcg · Two to three times daily (intranasal) · 10-14 days

Full Cortagen guide → Full Semax guide →

Cortagen vs Semax — common questions

What is the difference between Cortagen and Semax?

Cortagen: Khavinson short peptide bioregulator targeting cortical neurons and CNS gene expression. Typical dose 1,000-5,000 mcg. Semax: Neuroprotective ACTH analog with nootropic and neurotrophic properties. Typical dose 200-600 mcg. Both fall under the Bioregulators and Cognitive categories.

Can you stack Cortagen and Semax?

Stacking Cortagen with Semax is a protocol-design question best raised with a clinician — it depends on your goal, current bloodwork, and whether both peptides target overlapping mechanisms. Both peptides should be tracked independently with separate injection sites and timing. PinnyPeptide supports multi-peptide stacks with automatic injection site rotation.

Which is dosed more frequently, Cortagen or Semax?

Cortagen is typically dosed: Once daily morning (SubQ) or intranasal for Cognitive support. Semax is typically dosed: Once or twice daily (intranasal) for Cognitive enhancement; Two to three times daily (intranasal) for Neuroprotection / stroke recovery.

Are Cortagen and Semax FDA approved?

Cortagen: Not FDA approved. Semax: Not FDA approved for human use. Approved in Russia for stroke recovery, cognitive impairment, and optic nerve disease.

Related peptide comparisons

bronchogen vs cortagencardiogen vs cortagencartalax vs cortagencortagen vs crystagencortagen vs epithaloncortagen vs ovagen

Tracking either of these?

Log doses, automate injection site rotation, and never lose track of where you last pinned. Free forever.

Get Started Free