A Urologist Explains Peptides: What Each One Actually Does

First, what a peptide is

A peptide is a short chain of amino acids, the building blocks of protein. Your body already makes thousands of them as messengers. Insulin is a peptide. So are the hormones that tell you to feel full, to sleep, or to repair a tendon.

Because a peptide fits a specific receptor, it tends to do one job precisely. That is the appeal: a targeted message instead of a drug that affects everything.

Injury and recovery

BPC-157 comes from a protein made in the stomach. In animal studies it speeds healing of tendons, ligaments and the gut, partly by growing new blood vessels at the injury. Dr. Tatem says he has not seen clear harm in patients, but human data are still limited. He would use it on his own bad shoulder.

TB-500 improves blood flow to injured tissue and helps bring in the cells that rebuild it. It is often paired with BPC-157, which is why we offer them together.

KPV is a smaller peptide tied to tissue repair and calming inflammation, especially in the gut.

Skin, hair and looking younger

GHK-Cu is a copper peptide your body makes less of as you age. Used on the skin it supports collagen and elastin, and some people use it for hair. He also mentions it may help rosacea.

Epitalon is said to support telomerase, the enzyme that protects the ends of your DNA. He is openly skeptical that it is any kind of fountain of youth, but notes it may help your sleep-wake rhythm.

Sleep, focus and mood

DSIP (delta sleep-inducing peptide) is tied to the body clock and deeper sleep.

Selank is a calming peptide, often used for stress and sleep. Semax, its cousin, was studied in Russia for recovery after stroke and brain injury, and people use it for focus. Both are taken as a nasal spray, which is why they are on our Sleep and Everyday list.

Body composition and growth hormone

Tesamorelin is prescribable and best known for reducing belly fat. The fat comes back if you stop and change nothing else.

CJC-1295 and Ipamorelin are usually combined. They tell your own body to release more growth hormone rather than injecting growth hormone itself, which is gentler. Possible upsides: better sleep, recovery, skin and modest fat loss.

MOTS-c is nicknamed "exercise in a vial" because it may improve exercise tolerance and cellular energy. It is a helper, not a replacement for training.

Sexual health

PT-141 (bremelanotide) works in the brain, not the blood vessels, so it helps desire as well as function, for men and women. It is prescribable now.

Oxytocin, the bonding hormone, is also prescribable and used as a nasal spray.

GLP-1s and the muscle problem

Semaglutide and tirzepatide slow digestion, cut appetite and improve insulin sensitivity. He calls tirzepatide the most powerful weight-loss medication available. Retatrutide, the newer three-in-one, produced even larger weight loss in trials.

The catch he stresses: fast weight loss burns muscle along with fat unless you lift weights and eat enough protein. Losing muscle makes insulin resistance worse, which is the opposite of the goal. That is why every weight-loss program we run includes a protein and training plan, not just the injection.

His rules, which are also ours

Do not buy research-use-only peptides. Figure out the actual problem before picking the tool. Check testosterone and metabolic health first. Work with a physician and a licensed compounding pharmacy. And remember that every benefit comes with a trade-off.

Common Questions

All treatments are medical services. Every guest is screened, and every treatment is prescribed by a licensed provider. Nothing on this page is medical advice for you personally, and the opinions summarized here belong to the doctors named, not to Zen IV Spa. Talk to a provider before starting or stopping anything.