Peptides for ADHD and autism: what the evidence actually shows

What did @daviddemesquita actually say?

The creator pitched two peptides, which he calls "C-Max" and "Salient" (almost certainly Semax and Selank), as alternatives to stimulant medications for ADHD and ADD. His core argument: stimulants blast you with dopamine, raise your heart rate, and crank up anxiety. Semax, he says, "drives up dopamine" for cognitive focus, while Selank "drives up GABA" to calm you down. He also name-dropped BDNF, claimed stimulants suppress it, and said resistance training and Semax can restore it. He finished with a reference to stroke research. Dosing was mentioned explicitly: 500 micrograms of Semax, up to two to three times per day.

That last part is worth flagging immediately. Recommending specific dosing protocols for unapproved research compounds to a general TikTok audience is irresponsible, and this fact-check will not repeat or endorse those numbers as clinical guidance.

Does the science back this up?

Partially, but the gap between "there is research" and "this will change your world" is enormous, and the creator blurs that line throughout. Semax is a synthetic analog of ACTH(4-7) developed in Russia, where it has been studied and is actually approved for neurological conditions including stroke recovery. Selank is similarly a Russian-developed synthetic peptide based on tuftsin. Neither is FDA-approved in the United States.

On Semax and BDNF: there is real animal data here. Dolotov et al. (2006, Journal of Neurochemistry) found Semax increased BDNF and its receptor TrkB in rat brain tissue. That is not nothing. On Selank and GABA: a 2007 study by Semenova et al. (Bulletin of Experimental Biology and Medicine) found Selank modulated GABAergic transmission in rats. Again, animal data. Human clinical trials for either compound specifically targeting ADHD symptoms essentially do not exist in peer-reviewed Western literature. The creator is extrapolating from mechanism to clinical outcome across a very wide and largely unstudied gap.

What did they get wrong (or right)?

Credit where it is due: the point about BDNF suppression from chronic stimulant use is a legitimate area of scientific discussion, though the evidence is mixed and context-dependent. The connection between resistance training and BDNF elevation is genuinely well-supported. Szuhany et al. (2015, Journal of Psychiatric Research) conducted a meta-analysis confirming exercise robustly increases BDNF levels. That part of the video is actually solid.

What is wrong, or at least badly overstated: calling Semax and Selank "natural" peptides is misleading. Semax is a synthetic heptapeptide. It does not occur naturally in the human body. Selank is a synthetic analog. The word "natural" in this context appears designed to contrast with pharmaceuticals in a way that implies safety, and that implication is not earned by the evidence. The creator also frames stimulant medications as simply "blasting" the brain, which flattens a complex pharmacological picture and could discourage people from evidence-based treatment. That is the most consequential problem with this video.

What should you actually know?

Semax and Selank are genuinely interesting research compounds with plausible mechanisms. The science is not made up. But "interesting mechanism in rodents" and "proven treatment for ADHD" are not the same category, and this video regularly treats them as if they are. There are no randomized controlled trials of Semax or Selank for ADHD in humans published in peer-reviewed English-language journals as of this writing.

In the United States, both compounds exist in a regulatory gray zone, often sold as research chemicals or compounded by pharmacies operating outside standard FDA oversight. Quality control is a real concern. You cannot verify purity or concentration the way you can with an FDA-approved medication.

If you have ADHD and are curious about adjunct approaches, the resistance training recommendation here is the one thing backed by solid human data. Everything else in this video requires a conversation with a physician who actually knows your history, not a TikTok dosing suggestion.