Histrelin

How it works

A year-long arm implant releasing a GnRH copy, the brain's puberty signal, nonstop until the pituitary tunes out. Puberty, paused.

What it's made of

9 amino acids: GnRH with a D-histidine carrying an extra ring at position 6 and the final glycine replaced by an ethylamide. More potent and longer-lasting than the hormone.

What it's for

Prescribed for

Central precocious puberty in children.