Nasal peptides for ADHD: separating signal from TikTok noise

What did @rhirhi2026 actually say?

The creator is talking about Semax, a synthetic peptide developed in Russia, though they refer to it as "CMACs" throughout the video. They describe it as something used clinically for stroke and cognitive disorders, and they suggest it can help the brain "learn, form new connections and focus." They also mention making their own nasal spray at home and invite viewers with ADHD to share whether they inject or use nasal administration.

To their credit, they opened with a disclaimer that this is not medical advice. But the framing, asking ADHD viewers if they've "tried" Semax as a potential solution, does carry an implicit endorsement. That's worth keeping in mind as you read further.

Does the science back this up?

Some of it does, but the evidence base is thin and skewed toward animal models and small Russian clinical trials that have not been independently replicated in large Western studies.

Semax is a heptapeptide analog of ACTH(4-7) developed by the Institute of Molecular Genetics in Moscow. It has been registered in Russia as a nootropic drug since 1995 and is used clinically there for stroke, optic nerve disease, and cognitive impairment. The proposed mechanism involves upregulation of brain-derived neurotrophic factor (BDNF) and nerve growth factor (NGF), which are both relevant to synaptic plasticity and learning. A study by Dolotov et al. (2006, Journal of Neurochemistry) found that intranasal Semax increased BDNF levels in rat hippocampus. That is legitimately interesting. However, a rat hippocampus is not a human brain with ADHD, and we do not have randomized controlled trials in ADHD populations.

What did they get wrong (or right)?

They got the origin story basically right. Semax was indeed developed in Russia and has legitimate clinical use there for stroke and cognitive disorders. That is accurate. The claim that it can help your brain "learn, form new connections and focus" is plausible in theory but overstated as a practical benefit for a general audience.

What concerns me more is the casual mention of making a homemade nasal spray. Compounding peptides at home introduces real contamination and dosing risks. A 2021 FDA safety communication flagged compounded peptide products specifically for sterility concerns. There is also a meaningful difference between a pharmaceutical-grade Semax product manufactured under controlled conditions and something made in your kitchen. The creator does not address any of this, which is a meaningful omission for an audience that may take the DIY framing at face value.

The ADHD angle is the weakest part. There are no published clinical trials examining Semax specifically for ADHD. Linking a peptide with BDNF effects to ADHD because both involve attention is a logical leap that the current evidence does not support.

What should you actually know?

Semax is a real compound with a real research history, mostly from Russia and Eastern Europe. It is not a fringe supplement invented on a bodybuilding forum. But "has a research history" is not the same as "has proven efficacy for ADHD." Those are very different bars.

If you are managing ADHD, the treatments with the most rigorous evidence behind them are stimulant medications and behavioral therapies studied in thousands of patients over decades. Semax has been studied in dozens of patients, mostly for stroke recovery, mostly in one country. That asymmetry matters.

The nasal route is pharmacologically sensible for a peptide like Semax because it can bypass the blood-brain barrier more effectively than oral dosing. But "sensible mechanism" does not equal "safe to DIY." Anyone considering peptide use of any kind should be doing so under the supervision of a licensed provider who can assess individual risk, not based on a TikTok video, including this one.