Have you hit career peak but told to accept the decline of your brain and body. Start with the 20% of peptides and supplements that get 80% of the results.
This scene is pretty close to what Semax felt like. The noise of the world didn't change. My ability to process sensory input increased so much that the world felt calmer. I could feel it within 30 minutes, but after 5 hours, music sounded different. My senses felt more intimate.
Semax would have been my #1 peptide, except in the long run I could get the same effect permanently with MOTS-C for a brain energy upgrade. Semax does wear off—not completely, but the effect wanes by the end of the day.
Meat + fat = brain energy boost. All the upgrades you want are downstream brain energy upgrades. I used Venison, tallow, MOTS-C, SS31, Epitalon and BPC-157.