The Complete Guide to Peptide Therapy

Peptides are short chains of amino acids that serve as signaling molecules in the body. Unlike full-length proteins, therapeutic peptides are small enough to penetrate tissues and bind specific receptors, triggering targeted biological responses. This introductory guide covers the science behind peptide therapy, how peptides work at the cellular level, and what to expect when starting a protocol.

Healing peptides accelerate tissue repair by modulating inflammation, promoting angiogenesis, and stimulating stem cell migration. BPC-157 and TB-500 are the most widely researched compounds in this category, often combined in the popular "Wolverine Stack." Newer entries like LL-37 and KPV target immune modulation and gut healing, respectively.

Growth hormone secretagogues (GHS) stimulate the pituitary gland to release endogenous growth hormone, offering benefits for body composition, recovery, and sleep quality without the risks of exogenous HGH. The CJC-1295/Ipamorelin stack is the gold standard, while MK-677 provides an oral alternative. Sermorelin and Tesamorelin are FDA-recognized compounds with clinical data.

GLP-1 receptor agonists like semaglutide and tirzepatide have transformed obesity treatment, with retatrutide emerging as a next-generation triple agonist. Beyond incretin mimetics, peptides like AOD-9604 target fat metabolism directly, while MOTS-c acts as a mitochondrial exercise mimetic. This section covers every evidence-based peptide approach to body composition.

Nootropic peptides cross the blood-brain barrier to enhance neuroplasticity, protect neurons, and modulate neurotransmitter systems. Semax and Selank are Russian-developed peptides with clinical trial data for cognition and anxiety, while Dihexa shows extraordinary potency in preclinical models of neurodegeneration. Cerebrolysin remains the most clinically validated neuropeptide mixture.

Sleep peptides target the neurological pathways that regulate circadian rhythm and sleep architecture. DSIP (Delta Sleep-Inducing Peptide) is the most studied compound in this category, with evidence for enhancing slow-wave sleep without the dependency risks of pharmaceutical sleep aids. Growth hormone secretagogues like GHRP-6 also improve sleep quality as a secondary benefit.

Longevity peptides target the fundamental mechanisms of aging: telomere shortening, mitochondrial dysfunction, immune senescence, and cellular senescence. Epithalon activates telomerase to maintain telomere length, NAD+ precursors restore mitochondrial function, and thymic peptides like Thymalin rejuvenate the aging immune system. FOXO4-DRI represents a cutting-edge senolytic approach.

Peptides targeting sexual health work through diverse mechanisms: PT-141 (Bremelanotide) activates melanocortin receptors in the brain to enhance desire, Kisspeptin regulates the HPG axis to restore natural hormone production, and Gonadorelin stimulates LH/FSH release. These compounds offer alternatives to traditional hormone replacement for both men and women.

Cosmetic peptides work topically and systemically to stimulate collagen synthesis, reduce wrinkle depth, and improve skin elasticity. GHK-Cu is the most versatile, with benefits extending beyond skin to wound healing and hair growth. Matrixyl and SNAP-8 are signal peptides that mimic the skin's natural repair processes.

The peptide landscape extends far beyond the major categories. ARA-290 targets neuropathic pain through erythropoietin receptors, Elamipretide (SS-31) protects mitochondrial cardiolipin, Follistatin-344 inhibits myostatin for muscle growth, and VIP regulates circadian rhythm and immune function. These emerging compounds represent the frontier of peptide research.

Effective peptide therapy requires baseline and follow-up bloodwork to track biomarkers, adjust dosing, and ensure safety. This section covers which panels to order, how to interpret results, and when to modify your protocol based on lab values.

Put your knowledge into practice with our suite of interactive tools. Compare peptides head-to-head, calculate reconstitution volumes, analyze your bloodwork, or take a personalized quiz to find the right peptide protocol for your goals.