Semax

Semax is a synthetic peptide based on a fragment of adrenocorticotropic hormone (ACTH 4-10), modified to last longer in the body. The Russian clinical literature, where most research has been done, has focused on cognitive recovery after stroke and on attention and stress resilience under cognitive load.

Mechanistically, Semax appears to act on melanocortin receptors and to upregulate brain-derived neurotrophic factor (BDNF), a signaling molecule involved in learning and stress adaptation. Most of that mechanistic work is preclinical, with some human plasma BDNF data from stroke trials.

Most published Semax work is intranasal. The injectable subcutaneous form is what we use in this practice, dosed in short courses during periods when demand on focus and stamina is high.

Semax is a tool for short stretches, not a daily background protocol. Cycles of 2 to 4 weeks fit the way most patients use it: a hard quarter at work, a study period, a heavy training block, a long stretch of difficult shifts.

We don’t run it continuously. The published clinical work, even at therapeutic doses for stroke recovery, uses short courses with breaks. The peptide is rapidly cleared from blood, but its functional effects in the brain last longer.

Most patients notice something in the first week. If you’re not noticing anything by week two, the protocol probably isn’t doing what you wanted, and we’d revisit rather than extend.

Cognitive symptoms often have a hormonal layer underneath them. This protocol is often used to supplement other services like testosterone optimization and wellness injectables, especially in patients whose focus and stamina have shifted with age.