"Peptides" gets used like it means one thing — but peptides are a huge category of compounds, each with its own purpose, evidence base, and risk profile. A patient asking about peptide therapy could mean anything from a weight-loss medication to a recovery aid to a growth hormone stimulant. This guide separates what's real from what's hype.
By the end you'll know what peptides are, which categories we use clinically, what the research actually supports, and what to watch out for if someone offers you peptides outside a medical setting.
What is a peptide?
A peptide is a short chain of amino acids — the same building blocks that make up proteins, just smaller. Your body uses peptides constantly: insulin is a peptide, oxytocin is a peptide, growth hormone-releasing hormone is a peptide. Therapeutic peptides are either copies of natural peptides or modified versions designed to be more potent, more selective, or longer-lasting.
The reason peptides work as medications is that they bind to specific receptors in the body and trigger specific responses — like a key fitting a lock. That specificity is what makes them powerful and, when used correctly, relatively safe.
Quick fact
The first FDA-approved peptide medication was insulin in 1923. Today there are over 80 FDA-approved peptide drugs on the market, and dozens more in clinical trials.
The categories of peptides we use
Wellness clinics use peptides from a handful of distinct families. Each does something different.
Metabolic peptides (GLP-1 agonists)
Examples: semaglutide (Ozempic, Wegovy), tirzepatide (Mounjaro, Zepbound).
These are the headline-makers. They mimic the gut hormone GLP-1 (glucagon-like peptide-1), which signals fullness and slows gastric emptying. Originally developed for type 2 diabetes, they're now FDA-approved for weight management with substantial data behind them. Average weight loss in clinical trials is 15–20% of body weight over 12+ months.
Growth hormone secretagogues
Examples: sermorelin, ipamorelin, CJC-1295, tesamorelin.
These don't replace growth hormone directly — they stimulate your pituitary to release more of your own. The advantage: pulsatile, natural release patterns. Used for body composition, sleep quality, and recovery in age-related growth hormone decline. Tesamorelin is FDA-approved for HIV-associated lipodystrophy; the others are typically prescribed off-label or compounded.
Recovery and tissue-repair peptides
Examples: BPC-157, TB-500 (thymosin beta-4).
These are the most over-hyped on social media but have real preclinical data. Used by athletes and patients with chronic soft-tissue injuries to support healing. Human clinical evidence is more limited than the marketing suggests, so we use them selectively and discuss the evidence honestly.
Cognitive and neuro peptides
Examples: selank, semax, dihexa.
Limited mainstream clinical evidence. We rarely use these and only after extensive discussion with the patient.
Sexual function peptides
Examples: PT-141 (bremelanotide).
FDA-approved for hypoactive sexual desire disorder in premenopausal women under the brand Vyleesi. Used off-label in men and other contexts.
How peptide therapy actually works in practice
Most peptides are administered via subcutaneous injection — a small needle into the fat layer, similar to an insulin shot. Some peptides are available as oral capsules, nasal sprays, or troches (lozenges that dissolve in the mouth), but injection is generally the most reliable delivery route for systemic effect.
A typical peptide protocol looks like this:
- Initial consult and labs. We establish what you're trying to improve, rule out red flags, and check baseline metabolic markers, hormones, and inflammation.
- Protocol selection. We match peptide(s) to the goal and your clinical picture. Combinations are common — e.g. CJC-1295 + ipamorelin for body composition, or semaglutide for weight loss alongside lifestyle changes.
- Pharmacy. Peptides are dispensed by a licensed compounding pharmacy that specializes in peptides. They ship directly to you with full instructions.
- Self-administration. Most patients inject themselves at home after a brief in-office training. The needles are tiny and the technique is straightforward.
- Follow-up. Labs and check-ins at 6–12 weeks, then less frequently. We adjust dose, switch peptides, or stop based on results.
Who is and isn't a candidate
Peptide therapy is most appropriate for:
- Adults (typically 30+) with specific, identifiable goals — body composition, recovery, sleep quality, weight loss, sexual function
- Patients who've already addressed sleep, nutrition, training, and stress fundamentals
- Patients without major contraindications (active cancer, severe cardiovascular disease, pregnancy)
Peptide therapy is not appropriate for:
- Anyone seeking peptides as a substitute for sleep, nutrition, or movement
- Patients with active malignancy (growth-promoting peptides especially)
- Pregnant or breastfeeding women
- Anyone who can't or won't commit to follow-up labs and monitoring
Red flags when shopping for peptide therapy
Peptides have become a Wild West online, with research-only suppliers selling to consumers and unlicensed providers prescribing without proper evaluation. Watch for:
- "Research peptides" sold online. These are not held to medical-grade purity standards. Contamination, mislabeling, and underdosing are common.
- No bloodwork required. A clinician who'll sell you peptides without baseline labs isn't doing real medicine.
- One-size-fits-all protocols. Peptide selection should depend on your goals, your labs, and your medical history.
- Unrealistic claims. Anyone promising specific outcomes ("lose 30 pounds guaranteed") is selling a story, not a medical service.
- No follow-up. Peptides require monitoring. A clinic that doesn't schedule follow-ups isn't accountable for outcomes.
Frequently asked questions
Are peptides FDA approved?
Some peptides are FDA approved for specific medical uses (like semaglutide for diabetes and weight management, or sermorelin for growth hormone deficiency). Many wellness peptides are prescribed off-label or compounded by licensed pharmacies. We only use peptides that come from legitimate compounding pharmacies and are appropriate for the patient's clinical picture.
How long does it take to see results from peptide therapy?
Timelines vary by peptide and goal. Sleep and recovery improvements are often noticed within 2–4 weeks. Body composition changes typically take 8–12 weeks of consistent use. We monitor progress with labs and clinical markers, not just how you feel.
Are peptides safe?
When prescribed by a clinician and sourced from a reputable pharmacy, the peptides we use have well-characterized safety profiles. Side effects exist but are generally mild. The bigger risk is unmonitored online sources — research-grade peptides sold online are not held to medical-grade purity standards.
Is peptide therapy expensive?
Cost varies widely by peptide and dosing. Common protocols range from roughly $150 to $500 per month. Insurance rarely covers peptide therapy outside of FDA-approved indications, so most patients pay out of pocket. We're transparent about costs during the consultation.
What's next?
Peptide therapy isn't right for everyone, but for the right candidate it can be a high-leverage addition to a wellness plan. The first step is always the same: a consultation, an honest conversation about goals, and labs to see what's actually going on inside.