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Best Peptides for Chronic Fatigue: Evidence Comparison

The table below compares the three primary peptide categories used in clinical fatigue protocols. Each targets a distinct biological mechanism, and the choice depends on the underlying cause of the fatigue. Thymalin Immune restoration via thymosin signaling; i

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  • The table below compares the three primary peptide categories used in clinical fatigue protocols. Each targets a distinct biological mechanism, and the choice depends on the underlying cause of the fatigue.
  • Thymalin
  • Immune restoration via thymosin signaling; increases T-cell maturation and NK cell activity
  • Int J Immunopathology 2015 study: 40% reduction in fatigue scores over 8 weeks in chronic viral infection patients
  • 5–10mg SC daily for 10–20 days; maintenance every 3–6 months
  • 2–3 weeks for immune markers; 4–6 weeks for subjective energy improvement
  • Best for autoimmune or post-viral fatigue where immune dysregulation is the primary driver
  • Cerebrolysin
  • Neurotrophic support; mimics BDNF/NGF, promotes mitochondrial biogenesis via AMPK activation
  • CNS Drugs 2018 meta-analysis: significant cognitive and energy improvements in vascular cognitive impairment
  • 5–10ml IV or 1–2ml SC daily for 10–20 sessions
  • 2–4 weeks; cognitive clarity often precedes energy improvement
  • Optimal for fatigue with cognitive impairment, brain fog, or post-concussion syndrome
  • MK-677
  • GH secretagogue; increases 24-hour GH and IGF-1 levels, improves sleep architecture
  • J Clin Endocrinol Metab 1999: 50–90% increase in GH secretion with improved Stage 4 sleep
  • 12.5–25mg orally once daily before bed
  • 10–14 days for sleep quality; 8–12 weeks for peak energy and recovery benefits
  • Best for fatigue associated with poor recovery, low lean mass, or disrupted sleep patterns
  • CJC-1295/Ipamorelin
  • GH pulse optimisation; sustained pulsatile GH release mimicking natural patterns
  • Growth Hormone & IGF Res 2012: increased lean mass and exercise recovery in GH-deficient adults
  • 100–200mcg each peptide SC 2–3x/week before bed
  • 2–3 weeks for recovery; 6–8 weeks for sustained energy improvement
  • Best for athletes or active individuals with poor post-exercise recovery and persistent muscle fatigue
  • Dihexa
  • Neurotrophic peptide; increases dendritic spine density and blood-brain barrier penetration
  • Univ of Texas Med Branch research: 40% increase in hippocampal dendritic spine density
  • 1–2mg SC daily for 4–6 weeks; requires washout periods
  • 3–4 weeks; memory and mental stamina improve first
  • Best for cognitive fatigue and mental exhaustion where neuroplasticity is impaired

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