Here is the idea that reframes everything. Your body does not run on solid objects being injected. It runs on signals — tiny chemical messages delivered to specific sensors scattered across your cells.
Those sensors are called receptors. Think of them as locks. Every receptor is waiting for a specific key-shaped message to tell it what to do.
A peptide works by being that key. It "tickles" one of these sensors to nudge a specific, desired result — turning on appetite signaling, supporting a repair pathway, quieting an inflammatory message.
Crucially, it is not dropping something foreign into your body. It is touching something your body already has, with a message it already reads. Gentle, not violent.
✦ Key takeaway
A peptide is a key. A receptor is a lock. Fitting together sends the signal — it is not a foreign chemical doing violence.