Cognitive decline / brain fog
Subjective cognitive shifts — slower processing, word retrieval issues, memory lapses — typically age-related but sometimes post-illness or post-stress.
Nootropic + neurorestorative stack · 3 phases · guided multi-peptide program with decision criteria and add-to-stack handoff.
What changes during this transition
Nootropic and neural peptides cluster here: selank and semax for attention and processing speed (Russian Tier 3), dihexa for theoretical synaptic-formation support (no human data), cerebrolysin with the strongest documented effect on neural-recovery endpoints (clinical data in stroke recovery and dementia), P21 for mood + cognitive support (sparse data), NSI-189 for depression-with-cognitive component. None of these substitute for neurological workup if cognitive changes are progressive — Alzheimer's, vascular dementia, normal-pressure hydrocephalus, and metabolic causes (B12 deficiency, thyroid) all deserve diagnostic exclusion before peptides are considered.
Important caveat
Progressive cognitive decline warrants neurology referral, not peptide stacking. Acute or subacute cognitive changes warrant emergent workup (stroke, infection, metabolic). Brain fog after viral illness (long-COVID-type presentations) has its own emerging evidence base — peptide protocols are exploratory here.
Peptides editorially relevant to cognitive decline / brain fog
6 peptides from the library — each evidence-tiered honestly.
- SelankTier 3
Synthetic tuftsin analog (heptapeptide)
Russian-developed anxiolytic/nootropic peptide. Most clinical data is in Russian and methodologically thin by Western standards. Tier 3. Routes include intranasal — a natural pair with Juno's nasal-spray prep guide.
- SemaxTier 3
Synthetic ACTH(4-10) analog (heptapeptide)
Russian-developed nootropic and neuroprotective peptide. Registered there as a prescription product for stroke; most of the clinical evidence is Russian-language and not independently replicated outside that body of work.
- DihexaTier 3
HGF / c-Met agonist (cognitive)
Animal-only peptide aimed at restoring brain connections, with replicated cognitive-recovery signals in rodent models of Alzheimer's disease. No human trials.
- CerebrolysinTier 2
Porcine-derived neuropeptide mixture
Multi-peptide cocktail from porcine brain, manufactured by EVER Pharma. Approved in Europe / Asia / Russia for ischemic stroke, dementia, and TBI. NOT US-approved. Tier 1/2 abroad in approved indications; Tier 3 for off-label use.
- P21Tier 4
CNTF mimetic (cognitive)
Animal-only compound designed to mimic a brain growth factor. Strong rodent data on new neuron formation and cognitive recovery in disease models; zero published human evidence.
- BromantaneTier 3
Synthetic adamantane derivative (anti-asthenic / actoprotector)
Russian-developed anti-asthenic. Indirect dopaminergic effect via tyrosine hydroxylase upregulation. Tier 3 in Russian clinical literature; no Western replication. WADA-banned for athletes. Not technically a peptide — included for community completeness.
Want this list to grow? The library is editorial — if there’s a peptide you think belongs on this page with documented or mechanistically-clear evidence, send us a note with the citation and we’ll review it under the same evidence-tier discipline as every other entry.