What Is Peptide Therapy? A Complete Guide

What Are Therapeutic Peptides?#

Peptides are short chains of amino acids — the building blocks of proteins. The human body produces thousands of peptides naturally, using them as signalling molecules that regulate everything from hormone release and immune function to tissue repair and metabolism. Therapeutic peptides are synthesised versions of these natural compounds, used to supplement, mimic, or enhance the body's own peptide signalling. Unlike conventional drugs that often block or inhibit biological processes, most peptides work by supporting or amplifying existing pathways.

Common Types of Therapeutic Peptides#

Peptide therapy encompasses several distinct categories. Growth hormone secretagogues (CJC-1295, Ipamorelin, Sermorelin) stimulate the pituitary to release growth hormone through natural pulsatile patterns. Tissue repair peptides (BPC-157, TB-500) accelerate healing of soft tissue, tendons, gut lining, and neurological injuries. GLP-1 agonists (semaglutide, tirzepatide) regulate appetite and glucose metabolism. Immune-modulating peptides (Thymosin Alpha-1, LL-37) support immune function. Each category works through different mechanisms and serves different therapeutic goals.

How Peptide Therapy Is Administered#

Most therapeutic peptides are administered via subcutaneous injection — a small, shallow injection under the skin using an insulin syringe. The injection is typically painless and easy to self-administer. Some peptides are available as nasal sprays (Semax, Selank, PT-141). Oral administration is generally ineffective for most peptides due to enzymatic degradation in the digestive tract, though oral semaglutide tablets now exist. Frequency ranges from daily to 2-3x weekly to weekly depending on the compound.

Finding Peptide Therapy Near You#

Peptide therapy is offered through several channels. Anti-aging and functional medicine clinics increasingly offer peptide protocols as part of hormone optimisation programs. Telehealth platforms can prescribe peptides like semaglutide, tirzepatide, and some GH secretagogues with an online consultation. Compounding pharmacies fill these prescriptions and often ship nationwide. Concierge and longevity medicine clinics offer broader peptide menus. When searching for providers, look for practitioners with functional or sports medicine backgrounds who have experience with peptide protocols.

Search for 'functional medicine peptide therapy' or 'longevity clinic peptides' plus your city to find local providers.

What to Expect From Peptide Therapy#

Timeline and results vary significantly by compound and individual. GLP-1 agonists typically produce noticeable appetite reduction within 1-2 weeks and meaningful weight loss within 4-8 weeks. Growth hormone secretagogues work more gradually — improved sleep quality is often noticed first (within 2-4 weeks), with body composition changes becoming apparent over 3-6 months. Tissue repair peptides like BPC-157 are highly variable depending on the injury type and severity. Most practitioners recommend minimum 3-month cycles to evaluate efficacy. Regular blood work monitoring is important with any peptide protocol.