Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| DSIP (Delta Sleep-Inducing Peptide) | Semax | |
|---|---|---|
| Category | Peptides | Peptides |
| Standard Dose | Research indicates 100-300 mcg administered before bedtime via subcutaneous injection or intranasal. | Research indicates 200-600 mcg daily via intranasal administration (0.1% solution, 2-3 drops per nostril). |
| Timing | 30-60 minutes before desired sleep onset. Evening only. | Morning and early afternoon dosing (avoid evening — may cause stimulation/insomnia). Intranasal preferred for rapid CNS delivery. |
| Cycle Duration | 2-4 week cycles with equal rest periods to prevent tolerance. | 10-14 day cycles with equal rest periods. Some protocols use 3-5 day on / 2 day off patterns. |
| Evidence Level | animal_plus_anecdotal | moderate_human |
DSIP is a naturally occurring nonapeptide (Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu) originally isolated from rabbit brain hypothalamus in 1977. It modulates GABAergic neurotransmission by potentiating GABA-activated currents in hippocampal and cerebellar neurons while blocking NMDA-activated potentiation in cortical neurons. It also interacts with opioid-associated receptors, modulates serotonin and dopamine systems (increasing serotonin levels), and promotes delta wave (slow-wave) sleep through mechanisms that remain incompletely characterized.
Research indicates 100-300 mcg administered before bedtime via subcutaneous injection or intranasal.
30-60 minutes before desired sleep onset. Evening only.
2-4 week cycles with equal rest periods to prevent tolerance.
Semax (Met-Glu-His-Phe-Pro-Gly-Pro) is a synthetic heptapeptide analog of the ACTH(4-10) fragment that rapidly upregulates brain-derived neurotrophic factor (BDNF) and its signaling receptor TrkB in the hippocampus (1.4-fold BDNF protein increase, 3-fold exon III BDNF mRNA increase). It activates dopaminergic and serotonergic brain systems, enhances neurotrophin gene expression (BDNF, NGF), and modulates intracellular calcium dynamics in brain neurons. Semax lacks ACTH's corticotropic activity, acting purely as a nootropic/neuroprotective agent.
Research indicates 200-600 mcg daily via intranasal administration (0.1% solution, 2-3 drops per nostril).
Morning and early afternoon dosing (avoid evening — may cause stimulation/insomnia). Intranasal preferred for rapid CNS delivery.
10-14 day cycles with equal rest periods. Some protocols use 3-5 day on / 2 day off patterns.
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