Semax and Selank come up together constantly, and both have an unusual backstory: they were developed in Russia and have been used clinically there for years, while remaining largely unknown in Western medicine.

The shared origin

Both were developed at the Institute of Molecular Genetics in Russia, and both are modified fragments of naturally occurring compounds — given small structural changes to make them last longer in the body.

Semax — the focus one

Semax derives from a fragment of ACTH, a hormone involved in the stress response. Crucially, the fragment used is one without the hormonal activity of the full molecule.

Research centres on attention, memory consolidation, and protecting brain cells under stress. Much of the Russian clinical literature involves recovery contexts.

Selank — the calm one

Selank is based on tuftsin, a naturally occurring immune-related peptide. Research focuses on anxiety-like states and mood stability.

The recurring theme in the literature is calm without sedation — which is what distinguishes it from traditional anti-anxiety approaches, at least in the studies performed.

Side by side

The evidence caveat that matters

Here's the honest position: both have real human clinical data — more than most research peptides. That data comes overwhelmingly from Russian institutions, and much of it was published in Russian.

That's not a reason to dismiss it. It is a reason to note that independent replication in Western trials is limited, and that neither is approved in the US or EU.

Why they're grouped

They're frequently discussed as complements — one studied around alertness, one around calm. Both appear in our Peptide Directory under Brain & Mood.

Dissolv supplies Semax and Selank for laboratory research only. Neither is an approved medicine in the US, neither is for human or veterinary consumption, and nothing here is medical advice or dosing guidance.