Don't Buy Semax or Selank Before Watching This
A creator's six-week personal update on taking Semax and Selank together, describing what he felt from each and arguing against blanket stack advice.
Key moments
Tap a moment to play the video from there.
- 0:00Six-week goals and early verdictDay says he began Semax and Selank for focus and better sleep-readiness, and that one worked well for him while the other did nothing.
- 0:31Disclaimer and recap setupDay states he is not a doctor and that the video is based on his own experience, then starts recapping the two peptides.
- 1:02How Semax is describedDay says Semax derives from ACTH and raises BDNF, along with dopamine and serotonin activity.
- 2:03How Selank is describedDay describes Selank as a tuftsin analog that increases GABA A sensitivity, aimed mainly at reducing anxiety.
- 2:34His Semax resultsAt 1 mg a day by subcutaneous injection, Day reports reduced fog, longer focus, and better memory while reading.
- 3:35His Selank resultsDay says 1 mg and then 2 mg a day produced no noticeable effect, which he attributes to low baseline anxiety.
- 4:37Keep Semax, drop SelankDay says he will continue Semax and stop Selank, and argues that Selank may suit people with anxiety or high cortisol.
- 4:37Against blanket stack adviceDay criticizes recommending the same compounds to everyone without blood work or a baseline.
What the video says
William Day, a self-described non-doctor who experiments on himself, gives a six-week update on taking Semax and Selank, the pairing he says is usually sold as a cognitive stack. He started them to improve focus and be able to switch off at night. He says the two compounds turned out very differently for him, and he frames the video as a look at what happened, why, and what sellers of the combo leave out.
Before his results, Day recaps how he understands each one. He says Semax is derived from ACTH, increases BDNF, and raises dopamine and serotonin activity. He describes Selank as an analog of tuftsin that makes the brain more sensitive to GABA A, with some evidence of serotonin effects, and says its main purpose is reducing anxiety. He notes both come from Russian clinical research and have research behind them.
On his own experience, Day says he used Semax at 1 mg a day by subcutaneous injection. He reports less mental fog, cleaner thinking, longer focus without a stimulant feeling, and better retention while reading. He calls it one of the best things he has taken for cognitive performance and plans to continue.
Of Selank, he says he used the same 1 mg dose, raised it to 2 mg, and felt nothing either time. His explanation is that he is not an anxious person, so the compound had little to act on. He says it might suit someone with anxiety or elevated cortisol. He closes by criticizing blanket stack recommendations made without blood work or a baseline, and asks viewers to share their own experiences.
On each compound
Semax1:02
Day says Semax is derived from ACTH and increases BDNF, dopamine and serotonin activity. He reports that 1 mg a day by subcutaneous injection gave him less mental fog, longer focus and better memory, and he plans to continue.
See how your DNA reads SemaxSelank2:03
Day describes Selank as a tuftsin analog that raises sensitivity to GABA A and is mainly meant to reduce anxiety. He says he felt nothing at 1 mg or 2 mg a day, and suggests it may matter more for people who are anxious.
See how your DNA reads SelankWhat this video doesn’t settle
- It is one person's experience over six weeks, with no control group, blinding or measurements, so the reported effects cannot be separated from expectation.
- Day's explanation that Selank did nothing because he is not anxious is his own guess and is not tested in the video.
- The video does not show blood work, baseline data or sources for the mechanisms and Russian clinical research it mentions.
Questions this video answers
What did William Day experience taking Semax?
Day reports that 1 mg a day by subcutaneous injection reduced his mental fog and let him focus longer without a stimulant feel. He also says his memory and retention while reading seemed better. He plans to keep taking it.
Did Selank work for William Day?
No. Day says he felt no change in mood or stress at 1 mg a day, and still nothing after raising it to 2 mg. He thinks this is because he is not a very anxious person.
How does Day say Semax and Selank differ?
Day says Semax is derived from ACTH and acts on BDNF, dopamine and serotonin, giving focus. He says Selank is a tuftsin analog that acts on the GABA system and is built mainly to reduce anxiety.
Does Day recommend taking Semax and Selank as a stack?
Not as a default. Day argues that stacks are often recommended to everyone, but that individual baselines such as cortisol and stress response differ. He says people should not follow blanket advice without blood work or a clear goal.
Video by William Day on YouTube, embedded as published. The summary is written by PeptidesDNA from the video; every claim in it is the speaker’s. Not affiliated with or endorsed by the creator. Not medical advice.
