Compounds studied for neuro & cognitive, ranked by the strength of the evidence — strongest at the top, research-grade and disappointing below. Grades reflect the evidence, not marketing. This is a neutral reference; nothing here is a recommendation to use, and no compound is offered for sale.
Noopept is a dipeptide-derived small molecule (not a classical peptide, despite the ubiquitous label) developed in Russia and approved there as an oral nootropic.
Selank is a synthetic analog of the immune peptide tuftsin, developed in Russia (same institute and lead investigator as Semax) and approved there as a prescription anxiolytic…
Semax is a synthetic heptapeptide analog of an ACTH fragment and an approved neuroprotective/nootropic drug in Russia (since 1994).
Ranking is by evidence grade (A–F), the same ceiling shown on each compound page — not by popularity or margin. No dosing, reconstitution, or administration is given anywhere on Vallydia. See each entry for its full evidence table and legal status by region.
A neutral reference and a lawful-lane shop. Registered in Spain. Information for those who seek it — never promotion.
This site provides neutral scientific reference and sells only products lawful in your region. Nothing here is medical advice, a recommendation, or an offer to supply unapproved medicines. No dosing or administration is published for research compounds. Cosmetic peptides per Regulation (EC) 1223/2009. Unapproved injectable peptides are neither sold nor advertised in the EU (Directive 2001/83/EC, Title VIII). © 2026 Vallydia SL — Registered in Spain.