Selank vs Semax
Which should you choose? Here's what you need to know.
The short answer
Semax is more stimulating and focus-oriented. Selank is calming and anxiety-reducing. Both are Russian-developed nootropic peptides — often stacked together for balanced cognition.
On 9 Oct 2026 Peptide Compare tracked 56 vendors selling Selank, cheapest in stock $1.63 per mg at Bio Pepz, and 58 selling Semax, cheapest $2.12 per mg at Biotech Peptides.
Selank
Cognitive / NeuroSelank is a synthetic tuftsin analog with anxiolytic properties, working through GABA and serotonin pathways. It reduces anxiety while maintaining mental clarity — like a benzo without the sedation.
Choose Selank if:
Your primary goal is anxiety relief with clear-headed calm, or you're sensitive to stimulants.
Semax
Cognitive / NeuroSemax is a synthetic ACTH fragment that boosts BDNF and dopamine/serotonin activity. It's used for focus, cognitive performance, and neuroprotection. Users describe it as stimulating without jitteriness.
Choose Semax if:
You want sharper focus and cognitive performance, similar to a stimulant but without the crash.
Using both together
Selank + Semax is one of the most popular nootropic stacks. Semax provides the cognitive boost while Selank smooths out any overstimulation — calm focus.
Price & availability
Once you've decided which peptide fits your needs, here's how they compare on price and vendor options. Prices verified Oct 9, 2026.
Selank
Semax
$15.00
Starting from
$20.00
$13.25
Avg. price per mg
$11.50
56
Vendors selling it
58
64 options
In stock now
60 options
9.1/10
Top trust score
9.1/10
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Our top-rated vendor for each, based on trust scores, purity testing, and price.
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Where does this data come from?
We re-check vendor prices continuously and score vendors on Finnrick blind-test results — samples bought anonymously and sent to a lab, not vendor claims. No vendor can pay to rank higher. See our full methodology.