PinnyPeptide

Cortagen vs Testagen

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

Testagen

Bioregulators

Khavinson short peptide bioregulator targeting testicular tissue.

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

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.

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

Testagen effects

  • Reported support of Leydig cell testosterone production
  • Possible improvement in sperm parameters
  • Support of overall reproductive function
  • Anti-inflammatory effects in testicular tissue
  • Modulation of testicular gene expression

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

Testagen side effects

  • Generally well-tolerated in Russian clinical use
  • Mild injection-site reactions
  • Limited Western safety validation
  • Should not substitute for proper hypogonadism evaluation

Cortagen dosing ranges

Cognitive support

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

Testagen dosing ranges

Reproductive support

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

Full Cortagen guide → Full Testagen guide →

Cortagen vs Testagen — common questions

What is the difference between Cortagen and Testagen?

Cortagen: Khavinson short peptide bioregulator targeting cortical neurons and CNS gene expression. Typical dose 1,000-5,000 mcg. Testagen: Khavinson short peptide bioregulator targeting testicular tissue. Typical dose 1,000-5,000 mcg. Both fall under the Bioregulators category.

Can you stack Cortagen and Testagen?

Stacking Cortagen with Testagen 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 Testagen?

Cortagen is typically dosed: Once daily morning (SubQ) or intranasal for Cognitive support. Testagen is typically dosed: Once daily (SubQ) or sublingual for Reproductive support.

Are Cortagen and Testagen FDA approved?

Cortagen: Not FDA approved. Testagen: Not FDA approved.

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