Selank and Semax for ADHD: what the evidence actually says

What did @its.that.girl.tash actually say?

The creator says she has been using two peptides, Selank and Semax, for about eight weeks as part of a 12-week run. She uses Selank in the evenings, describing it as helpful for winding down and reducing anxiety, particularly the racing thoughts that can disrupt sleep in people with ADHD. Semax she uses in the morning through early afternoon, crediting it with improving concentration and helping her "zone in and focus" when her mind is scattered. She frames both as working well for her personally, and she's enthusiastic about the results. She does not claim to have a formal ADHD diagnosis, does not mention dosing, and does not suggest these are medical treatments. That framing actually matters when evaluating how much harm the video could cause.

Does the science back this up?

Partially, but the evidence base is thin and almost entirely from Russian research institutions, which raises legitimate reproducibility questions. Selank's anxiolytic effects have more support than Semax's ADHD-specific focus claims, but neither has been studied in randomized controlled trials on ADHD populations.

Selank is a synthetic heptapeptide derived from tuftsin. A 2014 study by Ковалев et al. published in Experimental and Clinical Pharmacology found anxiolytic and nootropic effects in animal models, and early Russian clinical data suggested reduced generalized anxiety without sedation. The mechanism proposed involves modulation of GABA-A receptors and influence on serotonin metabolism, which would explain why it might help with nighttime anxiety without knocking you out. That's a biologically plausible story for the evening use she describes. However, there are no large-scale, Western-peer-reviewed RCTs confirming this in humans with ADHD.

Semax has a slightly more interesting literature. Derived from ACTH(4-7), it has been studied in Russia for stroke recovery and cognitive impairment. A study by Gusev et al. (2005) in Cerebrovascular Diseases looked at its neuroprotective properties. Research on BDNF upregulation is real but mostly preclinical. Connecting that to "focus for ADHD" is a meaningful leap that the science has not yet closed.

What did they get wrong (or right)?

She got the directional framing roughly right, but oversimplified in ways that could mislead viewers. Calling Selank something that helps you "wind down" is consistent with its anxiolytic profile. Calling Semax a concentration tool is plausible given BDNF and dopamine pathway involvement, but presenting personal anecdote as a reliable signal for ADHD management is where the video becomes problematic.

What she got wrong, or at least left dangerously incomplete:

• Neither peptide is approved by the FDA for any indication. Both are sold as research chemicals in the US and many Western countries. That legal and regulatory reality is completely absent from her framing.
• Describing a 12-week self-directed peptide protocol for ADHD symptoms without mentioning medical supervision normalizes something that carries real risk, especially around nasal spray versus injectable formulations and sourcing quality.
• The claim that Semax helps if you "have skin thoughts" (almost certainly "scattered thoughts") is not inaccurate in spirit, but implying it can substitute for or supplement ADHD treatment without evidence specific to that population is a stretch.

She does not overclaim a cure or give dosing instructions, which keeps the video from falling into the most dangerous category. That's worth acknowledging.

What should you actually know?

If you have ADHD and you're curious about peptides like Selank and Semax, the honest answer is that the science is interesting but immature, and the regulatory situation is complicated in most Western countries. This is not a space where you should be taking cues from an eight-week personal experiment on TikTok, no matter how compelling the results sound.

A few things worth knowing before you go further:

• Sourcing matters enormously. Peptides sold as research chemicals are not manufactured to pharmaceutical standards. Contamination and mislabeling are documented problems in this market.
• Selank's anxiolytic mechanism is biologically plausible and has some human data behind it, but that data comes almost entirely from one country's research infrastructure and has not been independently replicated at scale.
• Semax has genuine neuroprotective research behind it, but the jump from "neuroprotective in stroke patients" to "helps ADHD focus" involves assumptions that have not been tested in clinical trials.
• If you have ADHD and are struggling with sleep and concentration, there are evidence-based interventions with decades of safety data that a licensed clinician can discuss with you. Peptides may eventually earn a place in that conversation, but they are not there yet.