Is Semax safe?
In Russian clinical use, yes by the available record. The absence of independent trials is the honest caveat.
Human trial data
Semax Side Effects
Registered drug in Russia with clinical use since the 1990s; limited independent Western data
Semax is a registered intranasal drug in Russia, used in stroke and cognitive indications, and its adverse-effect record there is benign: nasal irritation is the main complaint. Independent Western controlled trials are lacking, and research-grade injectable or nasal Semax is not the registered product.
Research-use information only. Research-grade Semax is not an approved medicine; where trial or label figures appear below they belong to the pharmaceutical product studied, not to any research vial. This page does not give dosing or medical advice.
What is reported
Every rate carries its source. Where no source exists, no rate is printed.
| Effect | Rate (sourced) | Detail | Source |
|---|---|---|---|
| Nasal irritation, discomfort | not quantified | Most commonly reported with the registered nasal formulation. | Russian clinical literature |
| Headache, restlessness | not quantified | Occasionally reported. | Russian clinical literature |
What is not known
- •Independent controlled safety data.
- •Long-term use.
Mechanism-based cautions
- •Modulates BDNF and other neurotrophins — no adverse mechanistic signal established, but the pathway is not trivial.
Regulatory status: Registered in Russia; not approved in the US or EU.
References
- Dolotov OV, et al. Semax, an analog of ACTH(4–10), regulates BDNF and trkB expression in the rat hippocampus. Brain Research, 2006.
What is actually in a research vial
Everything above describes Semax the molecule. The risk specific to a research vial is different: it may not contain Semax at the labelled amount, and it may contain what the synthesis left behind. Identity (mass spectrometry), purity (HPLC), measured net content and an endotoxin result are the four lines on a certificate that bear on adverse effects, and only a certificate you can check at the laboratory tells you any of them. This is what we have verified for Semax so far.
Who sells Semax, and what they document
9 of the 77 vendors on our scoreboard list Semax with a price we read on the product page (11 Sept 2026–2 Oct 2026). Of those, 9 name their testing laboratory, 6 publish certificates that resolve on the lab's own site, and 8 publish measured milligrams against the label. The full ranking, with every dated price, is on Best Semax Vendors.
| Vendor | Rubric | Lab named | Price read |
|---|---|---|---|
| Purgo Labspartner | 10/10 | SteriGenix · Freedom Diagnostics | $34.99 · 10mg · 2 Oct 2026 |
| TrustedPepspartner | 9/10 | Freedom Diagnostics (on certificates) | $20.00 · 10mg · 23 Sept 2026 |
| Everest Peptides | 8/10 | Freedom Diagnostics | $63.74 · 10mg · 23 Sept 2026 |
| PS Peptidespartner | 8/10 | North American Diagnostics | $42.99 · 5mg · 23 Sept 2026 |
| Mile High Compounds | 7/10 | Kovera Labs · Chromate | $39.99 · 10mg · 11 Sept 2026 |
Top 5 by rubric score; 4 more on the ranking page.
Semax certificates we have opened
None yet for Semax specifically. The COA library holds the certificates we have read for each vendor on other compounds, which is the next best signal of how that vendor documents a lot.