Quick Answer
Semax is a lab-made peptide based on a fragment of ACTH, a hormone made by the pituitary gland. It was developed in Russia, where it has been used for stroke recovery and some other brain conditions, and is usually taken as a nasal spray. It’s popular online for focus and memory, but most research comes from small Russian studies.
Who this is for: people who have read about Semax for focus, memory or mental energy and want to know what is actually known.
What Is Semax?
Semax is a chain of seven amino acids. Part of it copies a short section of ACTH (adrenocorticotropic hormone), and the rest was added to make it last longer in the body. Unlike ACTH, it isn’t designed to raise cortisol; researchers were interested in the brain-related effects of that ACTH fragment.
It was developed in the 1980s at a Russian research institute and has been used in Russia and some neighboring countries for conditions such as stroke and certain optic nerve problems. In the U.S., it is sold online as a “nootropic,” a term for products marketed to improve thinking, and is usually used as a nasal spray.
What the Research Shows
Animal and lab studies
Animal studies suggest Semax may raise levels of BDNF (brain-derived neurotrophic factor), a protein involved in the growth and survival of brain cells, and may affect dopamine and serotonin signaling. Some animal studies have looked at memory, learning and recovery after brain injury.
Human studies
Human studies come mostly from Russia. Several studied people recovering from stroke, sometimes reporting improvements in recovery measures, and others looked at attention or nerve-related eye conditions. Many of these studies are small, some lack comparison groups, and many were published in journals that aren’t widely reviewed internationally, which makes them hard to evaluate.
Research on whether Semax improves focus, memory or productivity in healthy adults, which is how it’s mostly marketed in the U.S., is still emerging.
Semax is usually taken as a nasal spray.
Side Effects and Unknowns
Reported side effects are usually mild, such as nasal irritation, headache, trouble sleeping or feeling overstimulated. Beyond that:
- Long-term safety hasn’t been well studied outside Russia.
- How it interacts with ADHD medications, antidepressants or other mood medications isn’t well understood.
- Quality can vary between sources, which is one reason to talk with a provider first.
It isn’t known to be safe during pregnancy or breastfeeding.
FDA Status
Semax is not FDA-approved, and its status for pharmacy compounding is unsettled.
A Different Place to Start
Brain fog and poor focus often have causes worth checking first, including thyroid problems, low iron or B12, poor sleep or sleep apnea, depression or anxiety, hormone changes and medication side effects. Many of these can be identified with a history and labs. See Brain Fog: When It’s Worth Getting Checked.
Talking With a Provider About Semax
If you’re weighing a peptide you’ve read about, Allana can review your health history, labs and goals and talk through what’s known and what isn’t, so you can make an informed decision.
Struggling with focus or brain fog? Let’s look at what may be behind it, starting with your labs.
Frequently Asked Questions
What's the difference between Semax and Selank?
Both were developed at the same Russian institute and are taken as nasal sprays. Semax is mainly promoted for focus and memory, Selank for anxiety and calm.
Can Semax treat ADHD?
It hasn't been tested or approved for ADHD in the U.S. Talk with a provider about established options.
Is Semax a stimulant?
It isn't classified as a stimulant, but some people report feeling more alert or having trouble sleeping.
References
This article is for general education and is not a substitute for individual medical advice. See our medical disclaimer.
