Peptides have gone from niche biohacking corner of the internet to the front page of every men's health clinic. Some of that attention is deserved. Some of it is bro-science. Here's a clinician-grade primer on the three peptide families that actually matter for men.
1. GLP-1 agonists (semaglutide, tirzepatide)
These are the headliners. Semaglutide (Wegovy, Ozempic) and tirzepatide (Mounjaro, Zepbound) mimic the GLP-1 hormone your gut releases after eating. They slow gastric emptying, blunt appetite, and improve insulin sensitivity.
For men carrying 30+ pounds of stubborn weight — especially visceral fat that's tied to low testosterone and metabolic issues — GLP-1s are genuinely category-defining. Average weight loss in clinical trials runs 15-22% of body weight over 12 months.
What to expect: Reduced appetite, faster satiety, GI side effects in the first few weeks (nausea, constipation). Most fade as your body adjusts. Dose titration matters — your clinician will start low and step up.
2. Growth hormone secretagogues (sermorelin, ipamorelin)
Sermorelin and ipamorelin don't add growth hormone directly. They prompt your pituitary gland to release more of its own. That's an important distinction — it preserves the natural pulsatile pattern of GH release, which is gentler on the body than synthetic HGH.
The effects are subtler than the marketing implies. Most men report better sleep quality, modest improvements in recovery, and over months a shift in body composition (slightly more lean mass, slightly less fat). It's a long game, not a transformation.
Best for: Men over 40 who feel their recovery has slowed, sleep has thinned out, and energy isn't what it was. Less compelling for younger men whose own GH levels are still high.
3. Recovery and joint peptides (BPC-157, TB-500)
BPC-157 ("Body Protection Compound") and TB-500 (a synthetic version of thymosin beta-4) are the recovery peptides athletes whisper about. The animal-model evidence for tissue healing — tendons, ligaments, gut lining — is genuinely interesting. Human evidence is limited but accumulating.
These aren't FDA-approved and aren't for everyone. They tend to be used by men with chronic soft-tissue issues that haven't responded to conventional treatment. Talk to a clinician before starting.
What peptides aren't
They aren't a replacement for training, sleep, or nutrition. They aren't anabolic steroids — different mechanism, different risk profile. They aren't permanent — the effects fade after you stop. And they aren't a one-size protocol — what works for a 30-year-old endurance athlete is wrong for a 55-year-old executive.
How to start
Get bloodwork first. Specifically: fasting glucose, A1C, lipid panel, comprehensive metabolic panel, and IGF-1 (a proxy for growth hormone activity). Your starting protocol depends on what shows up.
Then talk to a clinician — ideally one who uses peptides regularly, not someone treating them as a marketing add-on.