DSIP vs Semax
Which should you choose? Here's what you need to know.
The short answer
DSIP promotes deep sleep. Semax promotes focus and cognitive performance. Opposite ends of the arousal spectrum — one calms you down, the other sharpens you.
On 9 Oct 2026 Peptide Compare tracked 52 vendors selling DSIP, cheapest in stock $3.15 per mg at Modern Research, and 58 selling Semax, cheapest $2.12 per mg at Biotech Peptides.
DSIP
Cognitive / NeuroDSIP is a sleep-promoting peptide that enhances delta-wave sleep for physical recovery. It helps people fall asleep faster and achieve better sleep quality.
Choose DSIP if:
You need help with sleep quality and recovery — use it in the evening.
Semax
Cognitive / NeuroSemax is a stimulating nootropic peptide that boosts focus, BDNF, and cognitive performance. It's used during the day for mental clarity and neuroprotection.
Choose Semax if:
You want cognitive enhancement and focus during the day.
Using both together
Some people use both — Semax for daytime focus and DSIP for nighttime recovery. They target opposite ends of the wakefulness cycle.
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.
DSIP
Semax
$17.00
Starting from
$20.00
$9.55
Avg. price per mg
$11.50
52
Vendors selling it
58
48 options
In stock now
60 options
9.1/10
Top trust score
9.1/10
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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.