What is peptide therapy?

A peptide is a short chain of amino acids — typically 2 to 50 — linked by peptide bonds. When the chain gets longer (50+ amino acids), it folds into what we call a protein. So peptides are essentially small proteins, and your body runs on them: insulin is a peptide, oxytocin is a peptide, and the GLP-1 hormone that semaglutide mimics is a peptide.

In a therapeutic context, 'peptide therapy' refers to using synthetic or compounded peptides — sequences designed or selected because they bind a specific receptor and trigger a specific downstream effect. That specificity is the appeal: a peptide that stimulates growth hormone release does exactly that, rather than broadly affecting every system the way an oral supplement might.

Most therapeutic peptides work by mimicking or amplifying a signalling pathway your body already uses. Sermorelin, for example, is a fragment of growth hormone releasing hormone (GHRH) — it prompts your pituitary to release your own growth hormone in natural pulses, rather than replacing it the way injectable HGH would.

BPC-157, another widely used peptide, appears to promote angiogenesis (new blood vessel formation) and tissue repair at injury sites, based on preclinical studies. NAD+ is technically a coenzyme rather than a peptide, but it is commonly grouped into peptide protocols because it is administered by injection and targets cellular energy pathways.

The common thread: each peptide has a target, a mechanism, and an expected effect. The clinician's job is to match the right peptide to the right goal, dose it appropriately, and monitor results.

Peptide therapy is used across several categories of wellness and performance. None of these are FDA-approved cures for disease — they are clinician-supervised protocols that support specific outcomes.

Most therapeutic peptides are administered by subcutaneous injection — a small injection into the fatty tissue just under the skin, typically in the abdomen or thigh. The needle is very fine (similar to an insulin pen) and the process takes seconds. Some peptides, like glutathione, can also be given intramuscularly.

A clinician determines the dose, frequency, and protocol length based on your labs and goals. Most protocols run in defined cycles of 8 to 16 weeks, with a reassessment at the end rather than open-ended use.

When prescribed by a licensed clinician and prepared by a licensed compounding facility, peptide therapy is generally well-tolerated. The largest risk is not the molecule itself — it is the supply chain. Grey-market vials sold 'for research purposes only' carry no guarantee of identity, purity, sterility, or dose accuracy.

Common side effects vary by peptide but can include injection-site reactions, mild water retention, or temporary changes in appetite or sleep patterns. Contraindications include active malignancy, pregnancy, and certain endocrine conditions — which is why clinician screening and baseline labs matter.

Peptide therapy pricing depends on the specific peptide, the dose, and the protocol length. Most patients pay between $150 and $500 per month for a single-peptide protocol, with combination protocols costing more.

Costs typically include the compounded peptide, shipping, and periodic lab monitoring. Labs are recommended at baseline and at the end of each protocol to measure whether the intervention achieved its target.