Understand the source comparison
Best Peptides for ADHD Treatment: Category Comparison
Dihexa HGF receptor agonist; stimulates synaptogenesis in prefrontal cortex 40–60% oral; crosses BBB efficiently 0.25–2mg daily, oral or subcutaneous Increased synaptic density 300% in rodent PFC; sustained cognitive benefit 4 weeks post-dosing Strongest precl
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- Dihexa
- HGF receptor agonist; stimulates synaptogenesis in prefrontal cortex
- 40–60% oral; crosses BBB efficiently
- 0.25–2mg daily, oral or subcutaneous
- Increased synaptic density 300% in rodent PFC; sustained cognitive benefit 4 weeks post-dosing
- Strongest preclinical data for working memory and executive function; no human ADHD trials yet
- Cerebrolysin
- Neurotrophic peptide mixture (BDNF, NGF, CNTF); neuroprotective and neuroplasticity-enhancing
- IV administration only; peptides degraded orally
- 10–30mL IV, 5 days/week for 4 weeks
- Meta-analysis of 12 RCTs showed moderate-to-large effect sizes for attention and processing speed in cognitive impairment
- Only peptide with human clinical data in ADHD-adjacent populations; requires IV access
- P21
- Upregulates endogenous BDNF and CNTF; promotes dendritic growth
- Subcutaneous injection; minimal oral absorption
- 0.5–2mg subcutaneous, 2–3×/week
- Increased hippocampal neurogenesis 40% in aged rodents; improved attention task performance
- Derived from Cerebrolysin's active fraction; easier administration than IV but less clinical validation
- Thymalin
- Thymic peptide; modulates immune-neural signaling
- Subcutaneous or intramuscular injection
- 5–10mg IM, 1–2×/week
- Preclinical data on cognitive resilience under stress; no direct ADHD research
- Theoretical benefit through neuroimmune pathways; speculative for ADHD
- MK-677 (Ibutamoren)
- Growth hormone secretagogue; increases IGF-1 and GH
- 60–70% oral bioavailability
- 10–25mg daily, oral
- Improved sleep architecture and REM density; indirect cognitive effects via GH/IGF-1 axis
- Not a peptide (peptidomimetic); benefits ADHD indirectly through sleep and recovery; no direct attentional data