The Peptide Bazaar: Real Medicine vs. Vials from the Internet

Fork U with Dr. Terry Simpson · Apr 16, 2026 · 10m

The word “peptide” is doing too much work

Let’s start with the simplest truth.

A peptide is just a chain of amino acids—like pearls on a necklace. That’s it. Nothing mystical. Nothing magical.

However, structure matters. Sequence matters. Biology cares deeply about both.

Because of that, some peptides are extraordinarily powerful. Others are biologically interesting. And a growing number are simply… marketed.

That last category is where things get messy.

Before the hype, there was a miracle

Now rewind to a hospital ward in Toronto in the early 1920s.

Children with diabetes were dying. Not…