What a peptide is and isn't.
A peptide is a short chain of amino acids. That tells you what it's made of, not what it does or whether it works.
- A peptide is a short chain of amino acids joined by peptide bonds.
- The order of the links is the sequence. Change the order and you get a different molecule that behaves differently.
- Peptides and proteins are built the same way. Peptides are usually the shorter ones.
- "Peptide" names the kind of molecule. It says nothing about the evidence.
- Some peptides are approved drugs, like semaglutide (Wegovy, Ozempic). Others, like BPC-157, rest mostly on animal studies.
Small chains, big range
Amino acids link into chains. Some peptides carry messages between cells, and a lab-made peptide can look a lot like a natural one. A small chemical change can still alter what it does.
- KPV A three-amino-acid fragment of alpha-MSH.
- TB-500 Usually a seven-amino-acid piece of thymosin beta-4.
- DSIP A nine-amino-acid peptide studied mainly in small, older experiments.
What the word doesn't tell you
Peptides come up in metabolism, immunity, skin and nerve research. Some are in prescription drugs. Others have only been tested in cells or animals.
Which exact molecule was tested, in whom, and what happened? That beats asking whether peptides are good or bad.
Next: Lesson 2: How peptides work
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