Colostrinin vs Semax
A neutral, side-by-side comparison of two nootropic & cognitive peptides — their mechanisms, dosing ranges, administration routes, side effects, and research evidence. For research and educational purposes only.
Colostrinin
Proline-rich polypeptide complex isolated from ovine (sheep) colostrum. Originally researched as an Alzheimer's disease modulator, colostrinin has shown ability to stabilize cognitive function and reduce progression in mild-to-moderate Alzheimer's patients in double-blind trials. Also studied for immune modulation and anti-aging properties via cytokine balance normalization.
Full profileSemax
Semax is a synthetic heptapeptide derived from adrenocorticotropic hormone (ACTH) — specifically the 4–7 fragment modified with a C-terminal Pro-Gly-Pro extension for stability. Developed in Russia in the 1980s and used clinically there for stroke recovery, cognitive enhancement, and neuroprotection, it is one of the most researched nootropic peptides with a decades-long safety record in Eastern European clinical practice. Its primary mechanism involves potent upregulation of BDNF (Brain-Derived Neurotrophic Factor).
Full profile| Colostrinin | Semax | |
|---|---|---|
| Category | Nootropic & Cognitive | Nootropic & Cognitive |
| Also known as | PRP (proline-rich polypeptide), ND, colostrum neuropeptide, CLN, ovine proline-rich polypeptide | ACTH(4-7)PGP, Met-Glu-His-Phe-Pro-Gly-Pro |
| Evidence | Research-stage | Investigational (in trials) |
| Dosing range | 100mcg–400mcg mcg, sublingual, on a 3 days on / 3 days off cycle | 200mcg–900mcg mcg, Once or twice daily (intranasal most common) |
| Administration | Sublingual tablet/drop | Intranasal (preferred — high CNS bioavailability), Subcutaneous injection |
| Key side effects | Generally well-tolerated, Mild GI discomfort, Rare hypersensitivity (relevant for dairy protein sensitivity), Mild fatigue (initial days) | Mild anxiety or restlessness at high doses, Nasal irritation (intranasal route), Increased energy / difficulty sleeping if dosed too late in the day, Mild appetite suppression |
| Cited sources | 2 references | 3 references |
Key differences
- Evidence level differs: Colostrinin is research-stage, while Semax is investigational (in trials).
- Administration: Colostrinin — Sublingual tablet/drop; Semax — Intranasal (preferred — high CNS bioavailability), Subcutaneous injection.
- Frequency: Colostrinin is typically sublingual, on a 3 days on / 3 days off cycle; Semax is Once or twice daily (intranasal most common).
- Research depth: this profile cites 2 sources for Colostrinin vs 3 for Semax.
How each works
Colostrinin
Colostrinin modulates dendritic cell maturation and shifts cytokine balance toward anti-inflammatory patterns (reduced IL-6, TNF-α; increased IL-10). In neurological models, it reduces amyloid-β aggregation, decreases oxidative stress, and upregulates NGF while modulating the HPA axis stress response. A Polish double-blind trial showed statistically significant cognitive stabilization in mild-to-moderate AD patients over 15 weeks.
Semax
Semax increases BDNF expression in the hippocampus and frontal cortex by 1.3–1.6x at research doses in rodent models. It also upregulates NGF (nerve growth factor) and modulates serotonin, dopamine, and NMDA receptor systems. Russian clinical data (not yet replicated in Western trials) suggests efficacy in ischemic stroke recovery, ADHD, glaucoma, and cognitive decline. The Pro-Gly-Pro C-terminal extension dramatically improves resistance to enzymatic degradation compared to native ACTH(4-7).
This comparison aggregates public research and structured profile data for informational purposes only. It is not medical advice and does not recommend either compound for human use. Consult a qualified healthcare provider before considering any peptide.