Plain-English answers to the questions people usually ask before they start: what these compounds are, their legal footing, typical cost, and how to store and handle them.
Peptides are short chains of amino acids, smaller and simpler than full proteins, but built from the same building blocks. Because they're short, they can be made to mimic very specific signals your body already uses: telling fat cells to release energy, telling a wound to heal faster, or telling the pituitary gland to release growth hormone.
Most peptides people research fall into a few families: metabolic (GLP-1/GIP agonists like retatrutide and tirzepatide), healing/recovery (like BPC-157), and growth-hormone secretagogues (like CJC-1295 and tesamorelin). They're typically supplied as a freeze-dried powder in a vial and reconstituted with bacteriostatic water before use.
It depends on the compound and where you live. Some peptides are FDA-approved prescription drugs (tirzepatide, semaglutide). Others are sold as “research chemicals”: not approved for human use, and legally restricted to lab research in most places, even though people commonly use them off-label.
Rules vary by country and change over time, and enforcement is inconsistent. This page is general information, not legal advice. Check your local regulations and talk to a doctor or pharmacist before sourcing or using any compound.
Cost mostly comes down to three things: the compound itself (some are far more expensive to synthesize than others), the dose and vial size you need per month, and whether it's a prescription (often covered or discounted by insurance) or sourced independently (paid out of pocket, and highly variable in price and purity).
As a rough starting point, a month of a prescription GLP-1 can run from well-covered to well over a thousand dollars depending on insurance, while independently-sourced research peptides are often cheaper per vial but carry no guarantee of purity or dosing accuracy, and that tradeoff is worth weighing carefully.
Most reconstituted peptides are stable in the refrigerator (not the freezer) for 2–4 weeks. Check the specific compound's page for its window. Keep vials out of direct light, and never re-use a needle or share vials between people.