Semax is a synthetic peptide with potential nootropic and neuroprotective effects. It is an analog of the adrenocorticotropic hormone (ACTH) fragment 4-10.

Uses include, Cognitive enhancement, Improvement of memory and learning, Protection against brain damage, and treatment of attention-deficit hyperactivity disorder (ADHD).

The exact mechanism of action of Semax is not fully understood. However, it is believed to:

Increase the production of brain-derived neurotrophic factor (BDNF), a protein that promotes neuron growth and survival.

Improve blood flow to the brain.

Reduce inflammation in the brain.